HTML code for sharing PickledManyToManyField source code

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<div class="highlight" style="background: #f8f8f8"><pre style="line-height: 125%"><div id="lc1">import pickle
</div><div id="lc2">
</div><div id="lc3">from django.db.models import Field, BLANK_CHOICE_DASH
</div><div id="lc4">from django.utils.translation import ugettext_lazy, string_concat
</div><div id="lc5">from django.utils.encoding import smart_unicode
</div><div id="lc6">from django.utils.functional import curry
</div><div id="lc7">
</div><div id="lc8">class PickledManyToManyField(Field):
</div><div id="lc9"> def __init__(self, to, to_field=None, **kwargs):
</div><div id="lc10"> to_field = to_field or to._meta.pk.name
</div><div id="lc11"> kwargs[&#39;verbose_name&#39;] = kwargs.get(&#39;verbose_name&#39;, None)
</div><div id="lc12"> self.my_rel = PickledManyToManyRel(to, to_field,
</div><div id="lc13"> num_in_admin=kwargs.pop(&#39;num_in_admin&#39;, 0),
</div><div id="lc14"> filter_interface=kwargs.pop(&#39;filter_interface&#39;, None),
</div><div id="lc15"> limit_choices_to=kwargs.pop(&#39;limit_choices_to&#39;, None),
</div><div id="lc16"> raw_id_admin=kwargs.pop(&#39;raw_id_admin&#39;, False))
</div><div id="lc17"> if self.my_rel.raw_id_admin:
</div><div id="lc18"> kwargs.setdefault(&#39;validator_list&#39;, []).append(self.isValidIDList)
</div><div id="lc19"> super(PickledManyToManyField, self).__init__(**kwargs)
</div><div id="lc20">
</div><div id="lc21"> if self.my_rel.raw_id_admin:
</div><div id="lc22"> msg = ugettext_lazy(&#39;Separate multiple IDs with commas.&#39;)
</div><div id="lc23"> else:
</div><div id="lc24"> msg = ugettext_lazy(&#39;Hold down &quot;Control&quot;, or &quot;Command&quot; on a Mac, to select more than one.&#39;)
</div><div id="lc25"> self.help_text = string_concat(self.help_text, &#39; &#39;, msg)
</div><div id="lc26">
</div><div id="lc27"> def get_attname(self):
</div><div id="lc28"> return &#39;%s_%ss&#39; % (self.name, self.my_rel.to._meta.pk.name)
</div><div id="lc29">
</div><div id="lc30"> def set_attributes_from_rel(self):
</div><div id="lc31"> self.name = self.name or self.get_attname()
</div><div id="lc32"> self.verbose_name = self.verbose_name or self.my_rel.to._meta.verbose_name
</div><div id="lc33"> self.my_rel.field_name = self.my_rel.field_name or self.my_rel.to._meta.pk.name
</div><div id="lc34">
</div><div id="lc35"> def contribute_to_class(self, cls, name):
</div><div id="lc36"> super(PickledManyToManyField, self).contribute_to_class(cls, name)
</div><div id="lc37"> self.set_attributes_from_rel()
</div><div id="lc38"> self.related_query_name = lambda self: opts.object_name.lower()
</div><div id="lc39"> setattr(cls, self.name, PickledManyRelatedObjectDescriptor(self))
</div><div id="lc40"> standard_init = cls.__init__
</div><div id="lc41"> def unpickling_init(slf, *args, **kwargs):
</div><div id="lc42"> standard_init(slf, *args, **kwargs)
</div><div id="lc43"> value = getattr(slf, self.attname)
</div><div id="lc44"> if not isinstance(value, set):
</div><div id="lc45"> value = pickle.loads(value)
</div><div id="lc46"> setattr(slf, self.attname, value)
</div><div id="lc47"> cls.__init__ = unpickling_init
</div><div id="lc48">
</div><div id="lc49"> def db_type(self):
</div><div id="lc50"> return &#39;text&#39;
</div><div id="lc51">
</div><div id="lc52"> def to_python(self, value):
</div><div id="lc53"> return pickle.loads(value)
</div><div id="lc54">
</div><div id="lc55"> def get_db_prep_save(self, value):
</div><div id="lc56"> return pickle.dumps(value)
</div><div id="lc57">
</div><div id="lc58"> ###############################################
</div><div id="lc59"> # this is just copy-pasted from ManyToManyField
</div><div id="lc60"> def get_manipulator_field_objs(self):
</div><div id="lc61"> from django import oldforms
</div><div id="lc62"> if self.my_rel.raw_id_admin:
</div><div id="lc63"> return [oldforms.RawIdAdminField]
</div><div id="lc64"> else:
</div><div id="lc65"> choices = self.get_choices_default()
</div><div id="lc66"> return [curry(oldforms.SelectMultipleField,
</div><div id="lc67"> size=min(max(len(choices), 5), 15),
</div><div id="lc68"> choices=choices)]
</div><div id="lc69">
</div><div id="lc70"> def get_choices_default(self):
</div><div id="lc71"> return self.get_choices(include_blank=False)
</div><div id="lc72">
</div><div id="lc73"> def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH):
</div><div id="lc74"> &quot;Returns a list of tuples used as SelectField choices for this field.&quot;
</div><div id="lc75"> first_choice = include_blank and blank_choice or []
</div><div id="lc76"> if self.choices:
</div><div id="lc77"> return first_choice + list(self.choices)
</div><div id="lc78"> rel_model = self.my_rel.to
</div><div id="lc79"> if hasattr(self.my_rel, &#39;get_related_field&#39;):
</div><div id="lc80"> lst = [(getattr(x, self.my_rel.get_related_field().attname), smart_unicode(x))
</div><div id="lc81"> for x in rel_model._default_manager.complex_filter(self.my_rel.limit_choices_to)]
</div><div id="lc82"> else:
</div><div id="lc83"> lst = [(x._get_pk_val(), smart_unicode(x))
</div><div id="lc84"> for x in rel_model._default_manager.complex_filter(self.my_rel.limit_choices_to)]
</div><div id="lc85"> return first_choice + lst
</div><div id="lc86">
</div><div id="lc87"> def isValidIDList(self, field_data, all_data):
</div><div id="lc88"> &quot;Validates that the value is a valid list of foreign keys&quot;
</div><div id="lc89"> mod = self.my_rel.to
</div><div id="lc90"> try:
</div><div id="lc91"> pks = map(int, field_data.split(&#39;,&#39;))
</div><div id="lc92"> except ValueError:
</div><div id="lc93"> # the CommaSeparatedIntegerField validator will catch this error
</div><div id="lc94"> return
</div><div id="lc95"> objects = mod._default_manager.in_bulk(pks)
</div><div id="lc96"> if len(objects) != len(pks):
</div><div id="lc97"> badkeys = [k for k in pks if k not in objects]
</div><div id="lc98"> raise validators.ValidationError, ungettext(&quot;Please enter valid %(self)s IDs. The value %(value)r is invalid.&quot;,
</div><div id="lc99"> &quot;Please enter valid %(self)s IDs. The values %(value)r are invalid.&quot;, len(badkeys)) % {
</div><div id="lc100"> &#39;self&#39;: self.verbose_name,
</div><div id="lc101"> &#39;value&#39;: len(badkeys) == 1 and badkeys[0] or tuple(badkeys),
</div><div id="lc102"> }
</div><div id="lc103">
</div><div id="lc104"> # end of copy-past
</div><div id="lc105"> ##################
</div><div id="lc106">
</div><div id="lc107">
</div><div id="lc108">
</div><div id="lc109">class PickledManyRelatedObjectDescriptor(object):
</div><div id="lc110"> def __init__(self, field_with_rel):
</div><div id="lc111"> self.field = field_with_rel
</div><div id="lc112">
</div><div id="lc113"> def __get__(self, instance, instance_type=None):
</div><div id="lc114"> if instance is None:
</div><div id="lc115"> raise AttributeError, &quot;%s must be accessed via instance&quot; % self.field.name
</div><div id="lc116">
</div><div id="lc117"> self.field.renew_attfield(instance)
</div><div id="lc118"> val = getattr(instance, self.field.attname)
</div><div id="lc119">
</div><div id="lc120"> rel_model = self.field.my_rel.to
</div><div id="lc121"> superclass = rel_model._default_manager.__class__
</div><div id="lc122"> RelatedManager = create_pickled_many_related_manager(superclass)
</div><div id="lc123">
</div><div id="lc124"> manager = RelatedManager(
</div><div id="lc125"> model=rel_model,
</div><div id="lc126"> core_filters={&#39;%s__in&#39; % self.field.my_rel.field_name: val},
</div><div id="lc127"> instance=instance,
</div><div id="lc128"> attname=self.field.attname,
</div><div id="lc129"> )
</div><div id="lc130">
</div><div id="lc131"> return manager
</div><div id="lc132">
</div><div id="lc133"> def __set__(self, instance, value):
</div><div id="lc134"> if instance is None:
</div><div id="lc135"> raise AttributeError, &quot;%s must be accessed via instance&quot; % self._field.name
</div><div id="lc136"> # Set the value of the related field
</div><div id="lc137"> val = set()
</div><div id="lc138"> for obj in value:
</div><div id="lc139"> try:
</div><div id="lc140"> val.add(getattr(obj, self.field.my_rel.get_related_field().attname))
</div><div id="lc141"> except AttributeError:
</div><div id="lc142"> pass
</div><div id="lc143"> setattr(instance, self.field.attname, val)
</div><div id="lc144">
</div><div id="lc145"> # Clear the cache, if it exists
</div><div id="lc146"> try:
</div><div id="lc147"> delattr(instance, self.field.get_cache_name())
</div><div id="lc148"> except AttributeError:
</div><div id="lc149"> pass
</div><div id="lc150">
</div><div id="lc151">
</div><div id="lc152">class PickledManyToManyRel(object):
</div><div id="lc153"> def __init__(self, to, field_name, num_in_admin=0, filter_interface=None, limit_choices_to=None, raw_id_admin=False):
</div><div id="lc154"> self.to = to
</div><div id="lc155"> self.field_name = field_name
</div><div id="lc156"> self.num_in_admin = num_in_admin
</div><div id="lc157"> self.filter_interface = filter_interface
</div><div id="lc158"> if limit_choices_to is None:
</div><div id="lc159"> limit_choices_to = {}
</div><div id="lc160"> self.limit_choices_to = limit_choices_to
</div><div id="lc161"> self.edit_inline = False
</div><div id="lc162"> self.raw_id_admin = raw_id_admin
</div><div id="lc163"> self.multiple = True
</div><div id="lc164">
</div><div id="lc165"> self.related_name = &#39;%s_%s_set&#39; % (to._meta.pk.name, field_name)
</div><div id="lc166">
</div><div id="lc167"> assert not (self.raw_id_admin and self.filter_interface), &quot;ManyToManyRels may not use both raw_id_admin and filter_interface&quot;
</div><div id="lc168">
</div><div id="lc169"> # get_related_field = ManyToOneRel.get_related_field
</div><div id="lc170"> def get_related_field(self):
</div><div id="lc171"> &quot;Returns the Field in the &#39;to&#39; object to which this relationship is tied.&quot;
</div><div id="lc172"> return self.to._meta.get_field(self.field_name)
</div><div id="lc173">
</div><div id="lc174">
</div><div id="lc175">def create_pickled_many_related_manager(superclass):
</div><div id="lc176"> class RelatedManager(superclass):
</div><div id="lc177"> def __init__(self, model=None, core_filters=None, instance=None, attname=None):
</div><div id="lc178"> super(RelatedManager, self).__init__()
</div><div id="lc179"> self.model = model
</div><div id="lc180"> self.core_filters = core_filters
</div><div id="lc181"> self.instance = instance
</div><div id="lc182"> self.attname = attname
</div><div id="lc183">
</div><div id="lc184"> def get_query_set(self):
</div><div id="lc185"> return superclass.get_query_set(self).filter(**(self.core_filters))
</div><div id="lc186">
</div><div id="lc187"> def add(self, *objs):
</div><div id="lc188"> obj_pks = (obj.pk for obj in objs)
</div><div id="lc189"> setattr(self.instance, self.attname, getattr(self.instance, self.attname).union(obj_pks))
</div><div id="lc190"> add.alters_data = True
</div><div id="lc191">
</div><div id="lc192"> def remove(self, *objs):
</div><div id="lc193"> obj_pks = (obj.pk for obj in objs)
</div><div id="lc194"> setattr(self.instance, self.attname, getattr(self.instance, self.attname).difference(obj_pks))
</div><div id="lc195"> remove.alters_data = True
</div><div id="lc196">
</div><div id="lc197"> def clear(self):
</div><div id="lc198"> setattr(self.instance, self.attname, set())
</div><div id="lc199"> clear.alters_data = True
</div><div id="lc200">
</div><div id="lc201"> def create(self, **kwargs):
</div><div id="lc202"> new_obj = self.model(**kwargs)
</div><div id="lc203"> new_obj.save()
</div><div id="lc204"> self.add(new_obj)
</div><div id="lc205"> return new_obj
</div><div id="lc206"> create.alters_data = True
</div><div id="lc207"> return RelatedManager
</div></pre></div>
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BBCODE Copy To Clipboarddone!

[color=#008000][b]import[/b][/color] [color=#0000FF][b]pickle[/b][/color]

[color=#008000][b]from[/b][/color] [color=#0000FF][b]django.db.models[/b][/color] [color=#008000][b]import[/b][/color] Field, BLANK_CHOICE_DASH
[color=#008000][b]from[/b][/color] [color=#0000FF][b]django.utils.translation[/b][/color] [color=#008000][b]import[/b][/color] ugettext_lazy, string_concat
[color=#008000][b]from[/b][/color] [color=#0000FF][b]django.utils.encoding[/b][/color] [color=#008000][b]import[/b][/color] smart_unicode
[color=#008000][b]from[/b][/color] [color=#0000FF][b]django.utils.functional[/b][/color] [color=#008000][b]import[/b][/color] curry

[color=#008000][b]class[/b][/color] [color=#0000FF][b]PickledManyToManyField[/b][/color](Field):
    [color=#008000][b]def[/b][/color] [color=#0000FF]__init__[/color]([color=#008000]self[/color], to, to_field[color=#666666]=[/color][color=#008000]None[/color], [color=#666666]**[/color]kwargs):
        to_field [color=#666666]=[/color] to_field [color=#AA22FF][b]or[/b][/color] to[color=#666666].[/color]_meta[color=#666666].[/color]pk[color=#666666].[/color]name
        kwargs[[color=#BA2121]'verbose_name'[/color]] [color=#666666]=[/color] kwargs[color=#666666].[/color]get([color=#BA2121]'verbose_name'[/color], [color=#008000]None[/color])
        [color=#008000]self[/color][color=#666666].[/color]my_rel [color=#666666]=[/color] PickledManyToManyRel(to, to_field,
            num_in_admin[color=#666666]=[/color]kwargs[color=#666666].[/color]pop([color=#BA2121]'num_in_admin'[/color], [color=#666666]0[/color]),
            filter_interface[color=#666666]=[/color]kwargs[color=#666666].[/color]pop([color=#BA2121]'filter_interface'[/color], [color=#008000]None[/color]),
            limit_choices_to[color=#666666]=[/color]kwargs[color=#666666].[/color]pop([color=#BA2121]'limit_choices_to'[/color], [color=#008000]None[/color]),
            raw_id_admin[color=#666666]=[/color]kwargs[color=#666666].[/color]pop([color=#BA2121]'raw_id_admin'[/color], [color=#008000]False[/color]))
        [color=#008000][b]if[/b][/color] [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]raw_id_admin:
            kwargs[color=#666666].[/color]setdefault([color=#BA2121]'validator_list'[/color], [])[color=#666666].[/color]append([color=#008000]self[/color][color=#666666].[/color]isValidIDList)
        [color=#008000]super[/color](PickledManyToManyField, [color=#008000]self[/color])[color=#666666].[/color]__init__([color=#666666]**[/color]kwargs)

[color=#008000][b]if[/b][/color] [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]raw_id_admin:
            msg [color=#666666]=[/color] ugettext_lazy([color=#BA2121]'Separate multiple IDs with commas.'[/color])
        [color=#008000][b]else[/b][/color]:
            msg [color=#666666]=[/color] ugettext_lazy([color=#BA2121]'Hold down "Control", or "Command" on a Mac, to select more than one.'[/color])
        [color=#008000]self[/color][color=#666666].[/color]help_text [color=#666666]=[/color] string_concat([color=#008000]self[/color][color=#666666].[/color]help_text, [color=#BA2121]' '[/color], msg)

[color=#008000][b]def[/b][/color] [color=#0000FF]get_attname[/color]([color=#008000]self[/color]):
        [color=#008000][b]return[/b][/color] [color=#BA2121]'[/color][color=#BB6688][b]%s[/b][/color][color=#BA2121]_[/color][color=#BB6688][b]%s[/b][/color][color=#BA2121]s'[/color] [color=#666666]%[/color] ([color=#008000]self[/color][color=#666666].[/color]name, [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]to[color=#666666].[/color]_meta[color=#666666].[/color]pk[color=#666666].[/color]name)

[color=#008000][b]def[/b][/color] [color=#0000FF]set_attributes_from_rel[/color]([color=#008000]self[/color]):
        [color=#008000]self[/color][color=#666666].[/color]name [color=#666666]=[/color] [color=#008000]self[/color][color=#666666].[/color]name [color=#AA22FF][b]or[/b][/color] [color=#008000]self[/color][color=#666666].[/color]get_attname()
        [color=#008000]self[/color][color=#666666].[/color]verbose_name [color=#666666]=[/color] [color=#008000]self[/color][color=#666666].[/color]verbose_name [color=#AA22FF][b]or[/b][/color] [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]to[color=#666666].[/color]_meta[color=#666666].[/color]verbose_name
        [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]field_name [color=#666666]=[/color] [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]field_name [color=#AA22FF][b]or[/b][/color] [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]to[color=#666666].[/color]_meta[color=#666666].[/color]pk[color=#666666].[/color]name

[color=#008000][b]def[/b][/color] [color=#0000FF]contribute_to_class[/color]([color=#008000]self[/color], cls, name):
        [color=#008000]super[/color](PickledManyToManyField, [color=#008000]self[/color])[color=#666666].[/color]contribute_to_class(cls, name)
        [color=#008000]self[/color][color=#666666].[/color]set_attributes_from_rel()
        [color=#008000]self[/color][color=#666666].[/color]related_query_name [color=#666666]=[/color] [color=#008000][b]lambda[/b][/color] [color=#008000]self[/color]: opts[color=#666666].[/color]object_name[color=#666666].[/color]lower()
        [color=#008000]setattr[/color](cls, [color=#008000]self[/color][color=#666666].[/color]name, PickledManyRelatedObjectDescriptor([color=#008000]self[/color]))
        standard_init [color=#666666]=[/color] cls[color=#666666].[/color]__init__
        [color=#008000][b]def[/b][/color] [color=#0000FF]unpickling_init[/color](slf, [color=#666666]*[/color]args, [color=#666666]**[/color]kwargs):
            standard_init(slf, [color=#666666]*[/color]args, [color=#666666]**[/color]kwargs)
            value [color=#666666]=[/color] [color=#008000]getattr[/color](slf, [color=#008000]self[/color][color=#666666].[/color]attname)
            [color=#008000][b]if[/b][/color] [color=#AA22FF][b]not[/b][/color] [color=#008000]isinstance[/color](value, [color=#008000]set[/color]):
                value [color=#666666]=[/color] pickle[color=#666666].[/color]loads(value)
                [color=#008000]setattr[/color](slf, [color=#008000]self[/color][color=#666666].[/color]attname, value)
        cls[color=#666666].[/color]__init__ [color=#666666]=[/color] unpickling_init

[color=#008000][b]def[/b][/color] [color=#0000FF]db_type[/color]([color=#008000]self[/color]):
        [color=#008000][b]return[/b][/color] [color=#BA2121]'text'[/color]

[color=#008000][b]def[/b][/color] [color=#0000FF]to_python[/color]([color=#008000]self[/color], value):
        [color=#008000][b]return[/b][/color] pickle[color=#666666].[/color]loads(value)

[color=#008000][b]def[/b][/color] [color=#0000FF]get_db_prep_save[/color]([color=#008000]self[/color], value):
        [color=#008000][b]return[/b][/color] pickle[color=#666666].[/color]dumps(value)

[color=#408080][i]###############################################[/i][/color]
    [color=#408080][i]# this is just copy-pasted from ManyToManyField[/i][/color]
    [color=#008000][b]def[/b][/color] [color=#0000FF]get_manipulator_field_objs[/color]([color=#008000]self[/color]):
        [color=#008000][b]from[/b][/color] [color=#0000FF][b]django[/b][/color] [color=#008000][b]import[/b][/color] oldforms
        [color=#008000][b]if[/b][/color] [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]raw_id_admin:
            [color=#008000][b]return[/b][/color] [oldforms[color=#666666].[/color]RawIdAdminField]
        [color=#008000][b]else[/b][/color]:
            choices [color=#666666]=[/color] [color=#008000]self[/color][color=#666666].[/color]get_choices_default()
            [color=#008000][b]return[/b][/color] [curry(oldforms[color=#666666].[/color]SelectMultipleField,
                          size[color=#666666]=[/color][color=#008000]min[/color]([color=#008000]max[/color]([color=#008000]len[/color](choices), [color=#666666]5[/color]), [color=#666666]15[/color]),
                          choices[color=#666666]=[/color]choices)]

[color=#008000][b]def[/b][/color] [color=#0000FF]get_choices_default[/color]([color=#008000]self[/color]):
        [color=#008000][b]return[/b][/color] [color=#008000]self[/color][color=#666666].[/color]get_choices(include_blank[color=#666666]=[/color][color=#008000]False[/color])

[color=#008000][b]def[/b][/color] [color=#0000FF]get_choices[/color]([color=#008000]self[/color], include_blank[color=#666666]=[/color][color=#008000]True[/color], blank_choice[color=#666666]=[/color]BLANK_CHOICE_DASH):
        [color=#BA2121]"Returns a list of tuples used as SelectField choices for this field."[/color]
        first_choice [color=#666666]=[/color] include_blank [color=#AA22FF][b]and[/b][/color] blank_choice [color=#AA22FF][b]or[/b][/color] []
        [color=#008000][b]if[/b][/color] [color=#008000]self[/color][color=#666666].[/color]choices:
            [color=#008000][b]return[/b][/color] first_choice [color=#666666]+[/color] [color=#008000]list[/color]([color=#008000]self[/color][color=#666666].[/color]choices)
        rel_model [color=#666666]=[/color] [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]to
        [color=#008000][b]if[/b][/color] [color=#008000]hasattr[/color]([color=#008000]self[/color][color=#666666].[/color]my_rel, [color=#BA2121]'get_related_field'[/color]):
            lst [color=#666666]=[/color] [([color=#008000]getattr[/color](x, [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]get_related_field()[color=#666666].[/color]attname), smart_unicode(x))
                   [color=#008000][b]for[/b][/color] x [color=#AA22FF][b]in[/b][/color] rel_model[color=#666666].[/color]_default_manager[color=#666666].[/color]complex_filter([color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]limit_choices_to)]
        [color=#008000][b]else[/b][/color]:
            lst [color=#666666]=[/color] [(x[color=#666666].[/color]_get_pk_val(), smart_unicode(x))
                   [color=#008000][b]for[/b][/color] x [color=#AA22FF][b]in[/b][/color] rel_model[color=#666666].[/color]_default_manager[color=#666666].[/color]complex_filter([color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]limit_choices_to)]
        [color=#008000][b]return[/b][/color] first_choice [color=#666666]+[/color] lst

[color=#008000][b]def[/b][/color] [color=#0000FF]isValidIDList[/color]([color=#008000]self[/color], field_data, all_data):
        [color=#BA2121]"Validates that the value is a valid list of foreign keys"[/color]
        mod [color=#666666]=[/color] [color=#008000]self[/color][color=#666666].[/color]my_rel[color=#666666].[/color]to
        [color=#008000][b]try[/b][/color]:
            pks [color=#666666]=[/color] [color=#008000]map[/color]([color=#008000]int[/color], field_data[color=#666666].[/color]split([color=#BA2121]','[/color]))
        [color=#008000][b]except[/b][/color] [color=#D2413A][b]ValueError[/b][/color]:
            [color=#408080][i]# the CommaSeparatedIntegerField validator will catch this error[/i][/color]
            [color=#008000][b]return[/b][/color]
        objects [color=#666666]=[/color] mod[color=#666666].[/color]_default_manager[color=#666666].[/color]in_bulk(pks)
        [color=#008000][b]if[/b][/color] [color=#008000]len[/color](objects) [color=#666666]!=[/color] [color=#008000]len[/color](pks):
            badkeys [color=#666666]=[/color] [k [color=#008000][b]for[/b][/color] k [color=#AA22FF][b]in[/b][/color] pks [color=#008000][b]if[/b][/color] k [color=#AA22FF][b]not[/b][/color] [color=#AA22FF][b]in[/b][/color] objects]
            [color=#008000][b]raise[/b][/color] validators[color=#666666].[/color]ValidationError, ungettext([color=#BA2121]"Please enter valid [/color][color=#BB6688][b]%(self)s[/b][/color][color=#BA2121] IDs. The value [/color][color=#BB6688][b]%(value)r[/b][/color][color=#BA2121] is invalid."[/color],
                    [color=#BA2121]"Please enter valid [/color][color=#BB6688][b]%(self)s[/b][/color][color=#BA2121] IDs. The values [/color][color=#BB6688][b]%(value)r[/b][/color][color=#BA2121] are invalid."[/color], [color=#008000]len[/color](badkeys)) [color=#666666]%[/color] {
                [color=#BA2121]'self'[/color]: [color=#008000]self[/color][color=#666666].[/color]verbose_name,
                [color=#BA2121]'value'[/color]: [color=#008000]len[/color](badkeys) [color=#666666]==[/color] [color=#666666]1[/color] [color=#AA22FF][b]and[/b][/color] badkeys[[color=#666666]0[/color]] [color=#AA22FF][b]or[/b][/color] [color=#008000]tuple[/color](badkeys),
            }

[color=#408080][i]# end of copy-past[/i][/color]
    [color=#408080][i]##################[/i][/color]

[color=#008000][b]class[/b][/color] [color=#0000FF][b]PickledManyRelatedObjectDescriptor[/b][/color]([color=#008000]object[/color]):
    [color=#008000][b]def[/b][/color] [color=#0000FF]__init__[/color]([color=#008000]self[/color], field_with_rel):
        [color=#008000]self[/color][color=#666666].[/color]field [color=#666666]=[/color] field_with_rel

[color=#008000][b]def[/b][/color] [color=#0000FF]__get__[/color]([color=#008000]self[/color], instance, instance_type[color=#666666]=[/color][color=#008000]None[/color]):
        [color=#008000][b]if[/b][/color] instance [color=#AA22FF][b]is[/b][/color] [color=#008000]None[/color]:
            [color=#008000][b]raise[/b][/color] [color=#D2413A][b]AttributeError[/b][/color], [color=#BA2121]"[/color][color=#BB6688][b]%s[/b][/color][color=#BA2121] must be accessed via instance"[/color] [color=#666666]%[/color] [color=#008000]self[/color][color=#666666].[/color]field[color=#666666].[/color]name

[color=#008000]self[/color][color=#666666].[/color]field[color=#666666].[/color]renew_attfield(instance)
        val [color=#666666]=[/color] [color=#008000]getattr[/color](instance, [color=#008000]self[/color][color=#666666].[/color]field[color=#666666].[/color]attname)

rel_model [color=#666666]=[/color] [color=#008000]self[/color][color=#666666].[/color]field[color=#666666].[/color]my_rel[color=#666666].[/color]to
        superclass [color=#666666]=[/color] rel_model[color=#666666].[/color]_default_manager[color=#666666].[/color]__class__
        RelatedManager [color=#666666]=[/color] create_pickled_many_related_manager(superclass)

manager [color=#666666]=[/color] RelatedManager(
            model[color=#666666]=[/color]rel_model,
            core_filters[color=#666666]=[/color]{[color=#BA2121]'[/color][color=#BB6688][b]%s[/b][/color][color=#BA2121]__in'[/color] [color=#666666]%[/color] [color=#008000]self[/color][color=#666666].[/color]field[color=#666666].[/color]my_rel[color=#666666].[/color]field_name: val},
            instance[color=#666666]=[/color]instance,
            attname[color=#666666]=[/color][color=#008000]self[/color][color=#666666].[/color]field[color=#666666].[/color]attname,
            )

[color=#008000][b]return[/b][/color] manager

[color=#008000][b]def[/b][/color] [color=#0000FF]__set__[/color]([color=#008000]self[/color], instance, value):
        [color=#008000][b]if[/b][/color] instance [color=#AA22FF][b]is[/b][/color] [color=#008000]None[/color]:
            [color=#008000][b]raise[/b][/color] [color=#D2413A][b]AttributeError[/b][/color], [color=#BA2121]"[/color][color=#BB6688][b]%s[/b][/color][color=#BA2121] must be accessed via instance"[/color] [color=#666666]%[/color] [color=#008000]self[/color][color=#666666].[/color]_field[color=#666666].[/color]name
        [color=#408080][i]# Set the value of the related field[/i][/color]
        val [color=#666666]=[/color] [color=#008000]set[/color]()
        [color=#008000][b]for[/b][/color] obj [color=#AA22FF][b]in[/b][/color] value:
            [color=#008000][b]try[/b][/color]:
                val[color=#666666].[/color]add([color=#008000]getattr[/color](obj, [color=#008000]self[/color][color=#666666].[/color]field[color=#666666].[/color]my_rel[color=#666666].[/color]get_related_field()[color=#666666].[/color]attname))
            [color=#008000][b]except[/b][/color] [color=#D2413A][b]AttributeError[/b][/color]:
                [color=#008000][b]pass[/b][/color]
        [color=#008000]setattr[/color](instance, [color=#008000]self[/color][color=#666666].[/color]field[color=#666666].[/color]attname, val)

[color=#408080][i]# Clear the cache, if it exists[/i][/color]
        [color=#008000][b]try[/b][/color]:
            [color=#008000]delattr[/color](instance, [color=#008000]self[/color][color=#666666].[/color]field[color=#666666].[/color]get_cache_name())
        [color=#008000][b]except[/b][/color] [color=#D2413A][b]AttributeError[/b][/color]:
            [color=#008000][b]pass[/b][/color]

[color=#008000][b]class[/b][/color] [color=#0000FF][b]PickledManyToManyRel[/b][/color]([color=#008000]object[/color]):
    [color=#008000][b]def[/b][/color] [color=#0000FF]__init__[/color]([color=#008000]self[/color], to, field_name, num_in_admin[color=#666666]=[/color][color=#666666]0[/color], filter_interface[color=#666666]=[/color][color=#008000]None[/color], limit_choices_to[color=#666666]=[/color][color=#008000]None[/color], raw_id_admin[color=#666666]=[/color][color=#008000]False[/color]):
        [color=#008000]self[/color][color=#666666].[/color]to [color=#666666]=[/color] to
        [color=#008000]self[/color][color=#666666].[/color]field_name [color=#666666]=[/color] field_name
        [color=#008000]self[/color][color=#666666].[/color]num_in_admin [color=#666666]=[/color] num_in_admin
        [color=#008000]self[/color][color=#666666].[/color]filter_interface [color=#666666]=[/color] filter_interface
        [color=#008000][b]if[/b][/color] limit_choices_to [color=#AA22FF][b]is[/b][/color] [color=#008000]None[/color]:
            limit_choices_to [color=#666666]=[/color] {}
        [color=#008000]self[/color][color=#666666].[/color]limit_choices_to [color=#666666]=[/color] limit_choices_to
        [color=#008000]self[/color][color=#666666].[/color]edit_inline [color=#666666]=[/color] [color=#008000]False[/color]
        [color=#008000]self[/color][color=#666666].[/color]raw_id_admin [color=#666666]=[/color] raw_id_admin
        [color=#008000]self[/color][color=#666666].[/color]multiple [color=#666666]=[/color] [color=#008000]True[/color]

[color=#008000]self[/color][color=#666666].[/color]related_name [color=#666666]=[/color] [color=#BA2121]'[/color][color=#BB6688][b]%s[/b][/color][color=#BA2121]_[/color][color=#BB6688][b]%s[/b][/color][color=#BA2121]_set'[/color] [color=#666666]%[/color] (to[color=#666666].[/color]_meta[color=#666666].[/color]pk[color=#666666].[/color]name, field_name)

[color=#008000][b]assert[/b][/color] [color=#AA22FF][b]not[/b][/color] ([color=#008000]self[/color][color=#666666].[/color]raw_id_admin [color=#AA22FF][b]and[/b][/color] [color=#008000]self[/color][color=#666666].[/color]filter_interface), [color=#BA2121]"ManyToManyRels may not use both raw_id_admin and filter_interface"[/color]

[color=#408080][i]# get_related_field = ManyToOneRel.get_related_field[/i][/color]
    [color=#008000][b]def[/b][/color] [color=#0000FF]get_related_field[/color]([color=#008000]self[/color]):
        [color=#BA2121]"Returns the Field in the 'to' object to which this relationship is tied."[/color]
        [color=#008000][b]return[/b][/color] [color=#008000]self[/color][color=#666666].[/color]to[color=#666666].[/color]_meta[color=#666666].[/color]get_field([color=#008000]self[/color][color=#666666].[/color]field_name)

[color=#008000][b]def[/b][/color] [color=#0000FF]create_pickled_many_related_manager[/color](superclass):
    [color=#008000][b]class[/b][/color] [color=#0000FF][b]RelatedManager[/b][/color](superclass):
        [color=#008000][b]def[/b][/color] [color=#0000FF]__init__[/color]([color=#008000]self[/color], model[color=#666666]=[/color][color=#008000]None[/color], core_filters[color=#666666]=[/color][color=#008000]None[/color], instance[color=#666666]=[/color][color=#008000]None[/color], attname[color=#666666]=[/color][color=#008000]None[/color]):
            [color=#008000]super[/color](RelatedManager, [color=#008000]self[/color])[color=#666666].[/color]__init__()
            [color=#008000]self[/color][color=#666666].[/color]model [color=#666666]=[/color] model
            [color=#008000]self[/color][color=#666666].[/color]core_filters [color=#666666]=[/color] core_filters
            [color=#008000]self[/color][color=#666666].[/color]instance [color=#666666]=[/color] instance
            [color=#008000]self[/color][color=#666666].[/color]attname [color=#666666]=[/color] attname

[color=#008000][b]def[/b][/color] [color=#0000FF]get_query_set[/color]([color=#008000]self[/color]):
            [color=#008000][b]return[/b][/color] superclass[color=#666666].[/color]get_query_set([color=#008000]self[/color])[color=#666666].[/color]filter([color=#666666]**[/color]([color=#008000]self[/color][color=#666666].[/color]core_filters))

[color=#008000][b]def[/b][/color] [color=#0000FF]add[/color]([color=#008000]self[/color], [color=#666666]*[/color]objs):
            obj_pks [color=#666666]=[/color] (obj[color=#666666].[/color]pk [color=#008000][b]for[/b][/color] obj [color=#AA22FF][b]in[/b][/color] objs)
            [color=#008000]setattr[/color]([color=#008000]self[/color][color=#666666].[/color]instance, [color=#008000]self[/color][color=#666666].[/color]attname, [color=#008000]getattr[/color]([color=#008000]self[/color][color=#666666].[/color]instance, [color=#008000]self[/color][color=#666666].[/color]attname)[color=#666666].[/color]union(obj_pks))
        add[color=#666666].[/color]alters_data [color=#666666]=[/color] [color=#008000]True[/color]

[color=#008000][b]def[/b][/color] [color=#0000FF]remove[/color]([color=#008000]self[/color], [color=#666666]*[/color]objs):
            obj_pks [color=#666666]=[/color] (obj[color=#666666].[/color]pk [color=#008000][b]for[/b][/color] obj [color=#AA22FF][b]in[/b][/color] objs)
            [color=#008000]setattr[/color]([color=#008000]self[/color][color=#666666].[/color]instance, [color=#008000]self[/color][color=#666666].[/color]attname, [color=#008000]getattr[/color]([color=#008000]self[/color][color=#666666].[/color]instance, [color=#008000]self[/color][color=#666666].[/color]attname)[color=#666666].[/color]difference(obj_pks))
        remove[color=#666666].[/color]alters_data [color=#666666]=[/color] [color=#008000]True[/color]

[color=#008000][b]def[/b][/color] [color=#0000FF]clear[/color]([color=#008000]self[/color]):
            [color=#008000]setattr[/color]([color=#008000]self[/color][color=#666666].[/color]instance, [color=#008000]self[/color][color=#666666].[/color]attname, [color=#008000]set[/color]())
        clear[color=#666666].[/color]alters_data [color=#666666]=[/color] [color=#008000]True[/color]

[color=#008000][b]def[/b][/color] [color=#0000FF]create[/color]([color=#008000]self[/color], [color=#666666]**[/color]kwargs):
            new_obj [color=#666666]=[/color] [color=#008000]self[/color][color=#666666].[/color]model([color=#666666]**[/color]kwargs)
            new_obj[color=#666666].[/color]save()
            [color=#008000]self[/color][color=#666666].[/color]add(new_obj)
            [color=#008000][b]return[/b][/color] new_obj
        create[color=#666666].[/color]alters_data [color=#666666]=[/color] [color=#008000]True[/color]
    [color=#008000][b]return[/b][/color] RelatedManager

--------------------------------------
Colored with http://dumpz.org

Light HTML Copy To Clipboarddone!

That method generates HTML with CSS classes. Hence you'll need the style sheet file

<div class="highlight"><pre><div id="lc1">import pickle
</div><div id="lc2">
</div><div id="lc3">from django.db.models import Field, BLANK_CHOICE_DASH
</div><div id="lc4">from django.utils.translation import ugettext_lazy, string_concat
</div><div id="lc5">from django.utils.encoding import smart_unicode
</div><div id="lc6">from django.utils.functional import curry
</div><div id="lc7">
</div><div id="lc8">class PickledManyToManyField(Field):
</div><div id="lc9"> def __init__(self, to, to_field=None, **kwargs):
</div><div id="lc10"> to_field = to_field or to._meta.pk.name
</div><div id="lc11"> kwargs[&#39;verbose_name&#39;] = kwargs.get(&#39;verbose_name&#39;, None)
</div><div id="lc12"> self.my_rel = PickledManyToManyRel(to, to_field,
</div><div id="lc13"> num_in_admin=kwargs.pop(&#39;num_in_admin&#39;, 0),
</div><div id="lc14"> filter_interface=kwargs.pop(&#39;filter_interface&#39;, None),
</div><div id="lc15"> limit_choices_to=kwargs.pop(&#39;limit_choices_to&#39;, None),
</div><div id="lc16"> raw_id_admin=kwargs.pop(&#39;raw_id_admin&#39;, False))
</div><div id="lc17"> if self.my_rel.raw_id_admin:
</div><div id="lc18"> kwargs.setdefault(&#39;validator_list&#39;, []).append(self.isValidIDList)
</div><div id="lc19"> super(PickledManyToManyField, self).__init__(**kwargs)
</div><div id="lc20">
</div><div id="lc21"> if self.my_rel.raw_id_admin:
</div><div id="lc22"> msg = ugettext_lazy(&#39;Separate multiple IDs with commas.&#39;)
</div><div id="lc23"> else:
</div><div id="lc24"> msg = ugettext_lazy(&#39;Hold down &quot;Control&quot;, or &quot;Command&quot; on a Mac, to select more than one.&#39;)
</div><div id="lc25"> self.help_text = string_concat(self.help_text, &#39; &#39;, msg)
</div><div id="lc26">
</div><div id="lc27"> def get_attname(self):
</div><div id="lc28"> return &#39;%s_%ss&#39; % (self.name, self.my_rel.to._meta.pk.name)
</div><div id="lc29">
</div><div id="lc30"> def set_attributes_from_rel(self):
</div><div id="lc31"> self.name = self.name or self.get_attname()
</div><div id="lc32"> self.verbose_name = self.verbose_name or self.my_rel.to._meta.verbose_name
</div><div id="lc33"> self.my_rel.field_name = self.my_rel.field_name or self.my_rel.to._meta.pk.name
</div><div id="lc34">
</div><div id="lc35"> def contribute_to_class(self, cls, name):
</div><div id="lc36"> super(PickledManyToManyField, self).contribute_to_class(cls, name)
</div><div id="lc37"> self.set_attributes_from_rel()
</div><div id="lc38"> self.related_query_name = lambda self: opts.object_name.lower()
</div><div id="lc39"> setattr(cls, self.name, PickledManyRelatedObjectDescriptor(self))
</div><div id="lc40"> standard_init = cls.__init__
</div><div id="lc41"> def unpickling_init(slf, *args, **kwargs):
</div><div id="lc42"> standard_init(slf, *args, **kwargs)
</div><div id="lc43"> value = getattr(slf, self.attname)
</div><div id="lc44"> if not isinstance(value, set):
</div><div id="lc45"> value = pickle.loads(value)
</div><div id="lc46"> setattr(slf, self.attname, value)
</div><div id="lc47"> cls.__init__ = unpickling_init
</div><div id="lc48">
</div><div id="lc49"> def db_type(self):
</div><div id="lc50"> return &#39;text&#39;
</div><div id="lc51">
</div><div id="lc52"> def to_python(self, value):
</div><div id="lc53"> return pickle.loads(value)
</div><div id="lc54">
</div><div id="lc55"> def get_db_prep_save(self, value):
</div><div id="lc56"> return pickle.dumps(value)
</div><div id="lc57">
</div><div id="lc58"> ###############################################
</div><div id="lc59"> # this is just copy-pasted from ManyToManyField
</div><div id="lc60"> def get_manipulator_field_objs(self):
</div><div id="lc61"> from django import oldforms
</div><div id="lc62"> if self.my_rel.raw_id_admin:
</div><div id="lc63"> return [oldforms.RawIdAdminField]
</div><div id="lc64"> else:
</div><div id="lc65"> choices = self.get_choices_default()
</div><div id="lc66"> return [curry(oldforms.SelectMultipleField,
</div><div id="lc67"> size=min(max(len(choices), 5), 15),
</div><div id="lc68"> choices=choices)]
</div><div id="lc69">
</div><div id="lc70"> def get_choices_default(self):
</div><div id="lc71"> return self.get_choices(include_blank=False)
</div><div id="lc72">
</div><div id="lc73"> def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH):
</div><div id="lc74"> &quot;Returns a list of tuples used as SelectField choices for this field.&quot;
</div><div id="lc75"> first_choice = include_blank and blank_choice or []
</div><div id="lc76"> if self.choices:
</div><div id="lc77"> return first_choice + list(self.choices)
</div><div id="lc78"> rel_model = self.my_rel.to
</div><div id="lc79"> if hasattr(self.my_rel, &#39;get_related_field&#39;):
</div><div id="lc80"> lst = [(getattr(x, self.my_rel.get_related_field().attname), smart_unicode(x))
</div><div id="lc81"> for x in rel_model._default_manager.complex_filter(self.my_rel.limit_choices_to)]
</div><div id="lc82"> else:
</div><div id="lc83"> lst = [(x._get_pk_val(), smart_unicode(x))
</div><div id="lc84"> for x in rel_model._default_manager.complex_filter(self.my_rel.limit_choices_to)]
</div><div id="lc85"> return first_choice + lst
</div><div id="lc86">
</div><div id="lc87"> def isValidIDList(self, field_data, all_data):
</div><div id="lc88"> &quot;Validates that the value is a valid list of foreign keys&quot;
</div><div id="lc89"> mod = self.my_rel.to
</div><div id="lc90"> try:
</div><div id="lc91"> pks = map(int, field_data.split(&#39;,&#39;))
</div><div id="lc92"> except ValueError:
</div><div id="lc93"> # the CommaSeparatedIntegerField validator will catch this error
</div><div id="lc94"> return
</div><div id="lc95"> objects = mod._default_manager.in_bulk(pks)
</div><div id="lc96"> if len(objects) != len(pks):
</div><div id="lc97"> badkeys = [k for k in pks if k not in objects]
</div><div id="lc98"> raise validators.ValidationError, ungettext(&quot;Please enter valid %(self)s IDs. The value %(value)r is invalid.&quot;,
</div><div id="lc99"> &quot;Please enter valid %(self)s IDs. The values %(value)r are invalid.&quot;, len(badkeys)) % {
</div><div id="lc100"> &#39;self&#39;: self.verbose_name,
</div><div id="lc101"> &#39;value&#39;: len(badkeys) == 1 and badkeys[0] or tuple(badkeys),
</div><div id="lc102"> }
</div><div id="lc103">
</div><div id="lc104"> # end of copy-past
</div><div id="lc105"> ##################
</div><div id="lc106">
</div><div id="lc107">
</div><div id="lc108">
</div><div id="lc109">class PickledManyRelatedObjectDescriptor(object):
</div><div id="lc110"> def __init__(self, field_with_rel):
</div><div id="lc111"> self.field = field_with_rel
</div><div id="lc112">
</div><div id="lc113"> def __get__(self, instance, instance_type=None):
</div><div id="lc114"> if instance is None:
</div><div id="lc115"> raise AttributeError, &quot;%s must be accessed via instance&quot; % self.field.name
</div><div id="lc116">
</div><div id="lc117"> self.field.renew_attfield(instance)
</div><div id="lc118"> val = getattr(instance, self.field.attname)
</div><div id="lc119">
</div><div id="lc120"> rel_model = self.field.my_rel.to
</div><div id="lc121"> superclass = rel_model._default_manager.__class__
</div><div id="lc122"> RelatedManager = create_pickled_many_related_manager(superclass)
</div><div id="lc123">
</div><div id="lc124"> manager = RelatedManager(
</div><div id="lc125"> model=rel_model,
</div><div id="lc126"> core_filters={&#39;%s__in&#39; % self.field.my_rel.field_name: val},
</div><div id="lc127"> instance=instance,
</div><div id="lc128"> attname=self.field.attname,
</div><div id="lc129"> )
</div><div id="lc130">
</div><div id="lc131"> return manager
</div><div id="lc132">
</div><div id="lc133"> def __set__(self, instance, value):
</div><div id="lc134"> if instance is None:
</div><div id="lc135"> raise AttributeError, &quot;%s must be accessed via instance&quot; % self._field.name
</div><div id="lc136"> # Set the value of the related field
</div><div id="lc137"> val = set()
</div><div id="lc138"> for obj in value:
</div><div id="lc139"> try:
</div><div id="lc140"> val.add(getattr(obj, self.field.my_rel.get_related_field().attname))
</div><div id="lc141"> except AttributeError:
</div><div id="lc142"> pass
</div><div id="lc143"> setattr(instance, self.field.attname, val)
</div><div id="lc144">
</div><div id="lc145"> # Clear the cache, if it exists
</div><div id="lc146"> try:
</div><div id="lc147"> delattr(instance, self.field.get_cache_name())
</div><div id="lc148"> except AttributeError:
</div><div id="lc149"> pass
</div><div id="lc150">
</div><div id="lc151">
</div><div id="lc152">class PickledManyToManyRel(object):
</div><div id="lc153"> def __init__(self, to, field_name, num_in_admin=0, filter_interface=None, limit_choices_to=None, raw_id_admin=False):
</div><div id="lc154"> self.to = to
</div><div id="lc155"> self.field_name = field_name
</div><div id="lc156"> self.num_in_admin = num_in_admin
</div><div id="lc157"> self.filter_interface = filter_interface
</div><div id="lc158"> if limit_choices_to is None:
</div><div id="lc159"> limit_choices_to = {}
</div><div id="lc160"> self.limit_choices_to = limit_choices_to
</div><div id="lc161"> self.edit_inline = False
</div><div id="lc162"> self.raw_id_admin = raw_id_admin
</div><div id="lc163"> self.multiple = True
</div><div id="lc164">
</div><div id="lc165"> self.related_name = &#39;%s_%s_set&#39; % (to._meta.pk.name, field_name)
</div><div id="lc166">
</div><div id="lc167"> assert not (self.raw_id_admin and self.filter_interface), &quot;ManyToManyRels may not use both raw_id_admin and filter_interface&quot;
</div><div id="lc168">
</div><div id="lc169"> # get_related_field = ManyToOneRel.get_related_field
</div><div id="lc170"> def get_related_field(self):
</div><div id="lc171"> &quot;Returns the Field in the &#39;to&#39; object to which this relationship is tied.&quot;
</div><div id="lc172"> return self.to._meta.get_field(self.field_name)
</div><div id="lc173">
</div><div id="lc174">
</div><div id="lc175">def create_pickled_many_related_manager(superclass):
</div><div id="lc176"> class RelatedManager(superclass):
</div><div id="lc177"> def __init__(self, model=None, core_filters=None, instance=None, attname=None):
</div><div id="lc178"> super(RelatedManager, self).__init__()
</div><div id="lc179"> self.model = model
</div><div id="lc180"> self.core_filters = core_filters
</div><div id="lc181"> self.instance = instance
</div><div id="lc182"> self.attname = attname
</div><div id="lc183">
</div><div id="lc184"> def get_query_set(self):
</div><div id="lc185"> return superclass.get_query_set(self).filter(**(self.core_filters))
</div><div id="lc186">
</div><div id="lc187"> def add(self, *objs):
</div><div id="lc188"> obj_pks = (obj.pk for obj in objs)
</div><div id="lc189"> setattr(self.instance, self.attname, getattr(self.instance, self.attname).union(obj_pks))
</div><div id="lc190"> add.alters_data = True
</div><div id="lc191">
</div><div id="lc192"> def remove(self, *objs):
</div><div id="lc193"> obj_pks = (obj.pk for obj in objs)
</div><div id="lc194"> setattr(self.instance, self.attname, getattr(self.instance, self.attname).difference(obj_pks))
</div><div id="lc195"> remove.alters_data = True
</div><div id="lc196">
</div><div id="lc197"> def clear(self):
</div><div id="lc198"> setattr(self.instance, self.attname, set())
</div><div id="lc199"> clear.alters_data = True
</div><div id="lc200">
</div><div id="lc201"> def create(self, **kwargs):
</div><div id="lc202"> new_obj = self.model(**kwargs)
</div><div id="lc203"> new_obj.save()
</div><div id="lc204"> self.add(new_obj)
</div><div id="lc205"> return new_obj
</div><div id="lc206"> create.alters_data = True
</div><div id="lc207"> return RelatedManager
</div></pre></div>
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<blockquote><code>import&nbsp;pickle

from&nbsp;django.db.models&nbsp;import&nbsp;Field,&nbsp;BLANK_CHOICE_DASH
from&nbsp;django.utils.translation&nbsp;import&nbsp;ugettext_lazy,&nbsp;string_concat
from&nbsp;django.utils.encoding&nbsp;import&nbsp;smart_unicode
from&nbsp;django.utils.functional&nbsp;import&nbsp;curry

class&nbsp;PickledManyToManyField(Field):
&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__init__(self,&nbsp;to,&nbsp;to_field=None,&nbsp;**kwargs):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;to_field&nbsp;=&nbsp;to_field&nbsp;or&nbsp;to._meta.pk.name
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;kwargs[&#39;verbose_name&#39;]&nbsp;=&nbsp;kwargs.get(&#39;verbose_name&#39;,&nbsp;None)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.my_rel&nbsp;=&nbsp;PickledManyToManyRel(to,&nbsp;to_field,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;num_in_admin=kwargs.pop(&#39;num_in_admin&#39;,&nbsp;0),
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;filter_interface=kwargs.pop(&#39;filter_interface&#39;,&nbsp;None),
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;limit_choices_to=kwargs.pop(&#39;limit_choices_to&#39;,&nbsp;None),
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;raw_id_admin=kwargs.pop(&#39;raw_id_admin&#39;,&nbsp;False))
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;self.my_rel.raw_id_admin:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;kwargs.setdefault(&#39;validator_list&#39;,&nbsp;[]).append(self.isValidIDList)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;super(PickledManyToManyField,&nbsp;self).__init__(**kwargs)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;self.my_rel.raw_id_admin:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;msg&nbsp;=&nbsp;ugettext_lazy(&#39;Separate&nbsp;multiple&nbsp;IDs&nbsp;with&nbsp;commas.&#39;)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;msg&nbsp;=&nbsp;ugettext_lazy(&#39;Hold&nbsp;down&nbsp;&quot;Control&quot;,&nbsp;or&nbsp;&quot;Command&quot;&nbsp;on&nbsp;a&nbsp;Mac,&nbsp;to&nbsp;select&nbsp;more&nbsp;than&nbsp;one.&#39;)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.help_text&nbsp;=&nbsp;string_concat(self.help_text,&nbsp;&#39;&nbsp;&#39;,&nbsp;msg)

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;get_attname(self):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;&#39;%s_%ss&#39;&nbsp;%&nbsp;(self.name,&nbsp;self.my_rel.to._meta.pk.name)

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;set_attributes_from_rel(self):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.name&nbsp;=&nbsp;self.name&nbsp;or&nbsp;self.get_attname()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.verbose_name&nbsp;=&nbsp;self.verbose_name&nbsp;or&nbsp;self.my_rel.to._meta.verbose_name
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.my_rel.field_name&nbsp;=&nbsp;self.my_rel.field_name&nbsp;or&nbsp;self.my_rel.to._meta.pk.name

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;contribute_to_class(self,&nbsp;cls,&nbsp;name):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;super(PickledManyToManyField,&nbsp;self).contribute_to_class(cls,&nbsp;name)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.set_attributes_from_rel()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.related_query_name&nbsp;=&nbsp;lambda&nbsp;self:&nbsp;opts.object_name.lower()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setattr(cls,&nbsp;self.name,&nbsp;PickledManyRelatedObjectDescriptor(self))
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;standard_init&nbsp;=&nbsp;cls.__init__
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;unpickling_init(slf,&nbsp;*args,&nbsp;**kwargs):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;standard_init(slf,&nbsp;*args,&nbsp;**kwargs)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;value&nbsp;=&nbsp;getattr(slf,&nbsp;self.attname)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;not&nbsp;isinstance(value,&nbsp;set):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;value&nbsp;=&nbsp;pickle.loads(value)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setattr(slf,&nbsp;self.attname,&nbsp;value)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cls.__init__&nbsp;=&nbsp;unpickling_init

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;db_type(self):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;&#39;text&#39;

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;to_python(self,&nbsp;value):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;pickle.loads(value)

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;get_db_prep_save(self,&nbsp;value):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;pickle.dumps(value)

&nbsp;&nbsp;&nbsp;&nbsp;###############################################
&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;this&nbsp;is&nbsp;just&nbsp;copy-pasted&nbsp;from&nbsp;ManyToManyField
&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;get_manipulator_field_objs(self):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;from&nbsp;django&nbsp;import&nbsp;oldforms
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;self.my_rel.raw_id_admin:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;[oldforms.RawIdAdminField]
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;choices&nbsp;=&nbsp;self.get_choices_default()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;[curry(oldforms.SelectMultipleField,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;size=min(max(len(choices),&nbsp;5),&nbsp;15),
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;choices=choices)]

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;get_choices_default(self):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;self.get_choices(include_blank=False)

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;get_choices(self,&nbsp;include_blank=True,&nbsp;blank_choice=BLANK_CHOICE_DASH):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;Returns&nbsp;a&nbsp;list&nbsp;of&nbsp;tuples&nbsp;used&nbsp;as&nbsp;SelectField&nbsp;choices&nbsp;for&nbsp;this&nbsp;field.&quot;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;first_choice&nbsp;=&nbsp;include_blank&nbsp;and&nbsp;blank_choice&nbsp;or&nbsp;[]
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;self.choices:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;first_choice&nbsp;+&nbsp;list(self.choices)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;rel_model&nbsp;=&nbsp;self.my_rel.to
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;hasattr(self.my_rel,&nbsp;&#39;get_related_field&#39;):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lst&nbsp;=&nbsp;[(getattr(x,&nbsp;self.my_rel.get_related_field().attname),&nbsp;smart_unicode(x))
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for&nbsp;x&nbsp;in&nbsp;rel_model._default_manager.complex_filter(self.my_rel.limit_choices_to)]
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lst&nbsp;=&nbsp;[(x._get_pk_val(),&nbsp;smart_unicode(x))
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for&nbsp;x&nbsp;in&nbsp;rel_model._default_manager.complex_filter(self.my_rel.limit_choices_to)]
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;first_choice&nbsp;+&nbsp;lst

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;isValidIDList(self,&nbsp;field_data,&nbsp;all_data):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;Validates&nbsp;that&nbsp;the&nbsp;value&nbsp;is&nbsp;a&nbsp;valid&nbsp;list&nbsp;of&nbsp;foreign&nbsp;keys&quot;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mod&nbsp;=&nbsp;self.my_rel.to
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;try:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pks&nbsp;=&nbsp;map(int,&nbsp;field_data.split(&#39;,&#39;))
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;except&nbsp;ValueError:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;the&nbsp;CommaSeparatedIntegerField&nbsp;validator&nbsp;will&nbsp;catch&nbsp;this&nbsp;error
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;objects&nbsp;=&nbsp;mod._default_manager.in_bulk(pks)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;len(objects)&nbsp;!=&nbsp;len(pks):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;badkeys&nbsp;=&nbsp;[k&nbsp;for&nbsp;k&nbsp;in&nbsp;pks&nbsp;if&nbsp;k&nbsp;not&nbsp;in&nbsp;objects]
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;raise&nbsp;validators.ValidationError,&nbsp;ungettext(&quot;Please&nbsp;enter&nbsp;valid&nbsp;%(self)s&nbsp;IDs.&nbsp;The&nbsp;value&nbsp;%(value)r&nbsp;is&nbsp;invalid.&quot;,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;Please&nbsp;enter&nbsp;valid&nbsp;%(self)s&nbsp;IDs.&nbsp;The&nbsp;values&nbsp;%(value)r&nbsp;are&nbsp;invalid.&quot;,&nbsp;len(badkeys))&nbsp;%&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#39;self&#39;:&nbsp;self.verbose_name,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#39;value&#39;:&nbsp;len(badkeys)&nbsp;==&nbsp;1&nbsp;and&nbsp;badkeys[0]&nbsp;or&nbsp;tuple(badkeys),
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}

&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;end&nbsp;of&nbsp;copy-past
&nbsp;&nbsp;&nbsp;&nbsp;##################

class&nbsp;PickledManyRelatedObjectDescriptor(object):
&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__init__(self,&nbsp;field_with_rel):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.field&nbsp;=&nbsp;field_with_rel

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__get__(self,&nbsp;instance,&nbsp;instance_type=None):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;instance&nbsp;is&nbsp;None:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;raise&nbsp;AttributeError,&nbsp;&quot;%s&nbsp;must&nbsp;be&nbsp;accessed&nbsp;via&nbsp;instance&quot;&nbsp;%&nbsp;self.field.name

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.field.renew_attfield(instance)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;val&nbsp;=&nbsp;getattr(instance,&nbsp;self.field.attname)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;rel_model&nbsp;=&nbsp;self.field.my_rel.to
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;superclass&nbsp;=&nbsp;rel_model._default_manager.__class__
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;RelatedManager&nbsp;=&nbsp;create_pickled_many_related_manager(superclass)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;manager&nbsp;=&nbsp;RelatedManager(
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;model=rel_model,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;core_filters={&#39;%s__in&#39;&nbsp;%&nbsp;self.field.my_rel.field_name:&nbsp;val},
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;instance=instance,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;attname=self.field.attname,
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;manager

&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__set__(self,&nbsp;instance,&nbsp;value):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;instance&nbsp;is&nbsp;None:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;raise&nbsp;AttributeError,&nbsp;&quot;%s&nbsp;must&nbsp;be&nbsp;accessed&nbsp;via&nbsp;instance&quot;&nbsp;%&nbsp;self._field.name
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;Set&nbsp;the&nbsp;value&nbsp;of&nbsp;the&nbsp;related&nbsp;field
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;val&nbsp;=&nbsp;set()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for&nbsp;obj&nbsp;in&nbsp;value:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;try:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;val.add(getattr(obj,&nbsp;self.field.my_rel.get_related_field().attname))
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;except&nbsp;AttributeError:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pass
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setattr(instance,&nbsp;self.field.attname,&nbsp;val)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;Clear&nbsp;the&nbsp;cache,&nbsp;if&nbsp;it&nbsp;exists
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;try:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;delattr(instance,&nbsp;self.field.get_cache_name())
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;except&nbsp;AttributeError:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pass

class&nbsp;PickledManyToManyRel(object):
&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__init__(self,&nbsp;to,&nbsp;field_name,&nbsp;num_in_admin=0,&nbsp;filter_interface=None,&nbsp;limit_choices_to=None,&nbsp;raw_id_admin=False):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.to&nbsp;=&nbsp;to
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.field_name&nbsp;=&nbsp;field_name
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.num_in_admin&nbsp;=&nbsp;num_in_admin
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.filter_interface&nbsp;=&nbsp;filter_interface
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;limit_choices_to&nbsp;is&nbsp;None:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;limit_choices_to&nbsp;=&nbsp;{}
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.limit_choices_to&nbsp;=&nbsp;limit_choices_to
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.edit_inline&nbsp;=&nbsp;False
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.raw_id_admin&nbsp;=&nbsp;raw_id_admin
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.multiple&nbsp;=&nbsp;True

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.related_name&nbsp;=&nbsp;&#39;%s_%s_set&#39;&nbsp;%&nbsp;(to._meta.pk.name,&nbsp;field_name)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;assert&nbsp;not&nbsp;(self.raw_id_admin&nbsp;and&nbsp;self.filter_interface),&nbsp;&quot;ManyToManyRels&nbsp;may&nbsp;not&nbsp;use&nbsp;both&nbsp;raw_id_admin&nbsp;and&nbsp;filter_interface&quot;

&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;get_related_field&nbsp;=&nbsp;ManyToOneRel.get_related_field
&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;get_related_field(self):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;Returns&nbsp;the&nbsp;Field&nbsp;in&nbsp;the&nbsp;&#39;to&#39;&nbsp;object&nbsp;to&nbsp;which&nbsp;this&nbsp;relationship&nbsp;is&nbsp;tied.&quot;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;self.to._meta.get_field(self.field_name)

def&nbsp;create_pickled_many_related_manager(superclass):
&nbsp;&nbsp;&nbsp;&nbsp;class&nbsp;RelatedManager(superclass):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__init__(self,&nbsp;model=None,&nbsp;core_filters=None,&nbsp;instance=None,&nbsp;attname=None):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;super(RelatedManager,&nbsp;self).__init__()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.model&nbsp;=&nbsp;model
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.core_filters&nbsp;=&nbsp;core_filters
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.instance&nbsp;=&nbsp;instance
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.attname&nbsp;=&nbsp;attname

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;get_query_set(self):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;superclass.get_query_set(self).filter(**(self.core_filters))

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;add(self,&nbsp;*objs):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;obj_pks&nbsp;=&nbsp;(obj.pk&nbsp;for&nbsp;obj&nbsp;in&nbsp;objs)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setattr(self.instance,&nbsp;self.attname,&nbsp;getattr(self.instance,&nbsp;self.attname).union(obj_pks))
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;add.alters_data&nbsp;=&nbsp;True

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;remove(self,&nbsp;*objs):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;obj_pks&nbsp;=&nbsp;(obj.pk&nbsp;for&nbsp;obj&nbsp;in&nbsp;objs)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setattr(self.instance,&nbsp;self.attname,&nbsp;getattr(self.instance,&nbsp;self.attname).difference(obj_pks))
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;remove.alters_data&nbsp;=&nbsp;True

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;clear(self):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setattr(self.instance,&nbsp;self.attname,&nbsp;set())
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;clear.alters_data&nbsp;=&nbsp;True

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;create(self,&nbsp;**kwargs):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;new_obj&nbsp;=&nbsp;self.model(**kwargs)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;new_obj.save()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.add(new_obj)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;new_obj
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;create.alters_data&nbsp;=&nbsp;True
&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;RelatedManager
</code></blockquote>Colored with <a href="http://dumpz.org">dumpz.org</a>