Django class ValidationError Exception An error while validating data

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Django 1.6.5
class ValidationError(Exception):
"""An error while validating data."""
def __init__(self, message, code=None, params=None):
"""
The `message` argument can be a single error, a list of errors, or a
dictionary that maps field names to lists of errors. What we define as
an "error" can be either a simple string or an instance of
ValidationError with its message attribute set, and what we define as
list or dictionary can be an actual `list` or `dict` or an instance
of ValidationError with its `error_list` or `error_dict` attribute set.
"""
# PY2 can't pickle naive exception: http://bugs.python.org/issue1692335.
super(ValidationError, self).__init__(message, code, params)
if isinstance(message, ValidationError):
if hasattr(message, 'error_dict'):
message = message.error_dict
# PY2 has a `message` property which is always there so we can't
# duck-type on it. It was introduced in Python 2.5 and already
# deprecated in Python 2.6.
elif not hasattr(message, 'message' if six.PY3 else 'code'):
message = message.error_list
else:
message, code, params = message.message, message.code, message.params
if isinstance(message, dict):
self.error_dict = {}
for field, messages in message.items():
if not isinstance(messages, ValidationError):
messages = ValidationError(messages)
self.error_dict[field] = messages.error_list
elif isinstance(message, list):
self.error_list = []
for message in message:
# Normalize plain strings to instances of ValidationError.
if not isinstance(message, ValidationError):
message = ValidationError(message)
self.error_list.extend(message.error_list)
else:
self.message = message
self.code = code
self.params = params
self.error_list = [self]
@property
def message_dict(self):
# Trigger an AttributeError if this ValidationError
# doesn't have an error_dict.
getattr(self, 'error_dict')
return dict(self)
@property
def messages(self):
if hasattr(self, 'error_dict'):
return reduce(operator.add, dict(self).values())
return list(self)
def update_error_dict(self, error_dict):
if hasattr(self, 'error_dict'):
for field, error_list in self.error_dict.items():
error_dict.setdefault(field, []).extend(error_list)
else:
error_dict.setdefault(NON_FIELD_ERRORS, []).extend(self.error_list)
return error_dict
def __iter__(self):
if hasattr(self, 'error_dict'):
for field, errors in self.error_dict.items():
yield field, list(ValidationError(errors))
else:
for error in self.error_list:
message = error.message
if error.params:
message %= error.params
yield force_text(message)
def __str__(self):
if hasattr(self, 'error_dict'):
return repr(dict(self))
return repr(list(self))
def __repr__(self):
return 'ValidationError(%s)' % self
Django 1.7.1
class ValidationError(Exception):
"""An error while validating data."""
def __init__(self, message, code=None, params=None):
"""
ValidationError can be passed any object that can be printed (usually
a string), a list of objects or a dictionary.
"""
if isinstance(message, dict):
self.error_dict = message
elif isinstance(message, list):
self.error_list = message
else:
self.code = code
self.params = params
self.message = message
self.error_list = [self]
@property
def message_dict(self):
message_dict = {}
for field, messages in self.error_dict.items():
message_dict[field] = []
for message in messages:
if isinstance(message, ValidationError):
message_dict[field].extend(message.messages)
else:
message_dict[field].append(force_text(message))
return message_dict
@property
def messages(self):
if hasattr(self, 'error_dict'):
message_list = reduce(operator.add, self.error_dict.values())
else:
message_list = self.error_list
messages = []
for message in message_list:
if isinstance(message, ValidationError):
params = message.params
message = message.message
if params:
message %= params
message = force_text(message)
messages.append(message)
return messages
def __str__(self):
if hasattr(self, 'error_dict'):
return repr(self.message_dict)
return repr(self.messages)
def __repr__(self):
return 'ValidationError(%s)' % self
def update_error_dict(self, error_dict):
if hasattr(self, 'error_dict'):
if error_dict:
for k, v in self.error_dict.items():
error_dict.setdefault(k, []).extend(v)
else:
error_dict = self.error_dict
else:
error_dict[NON_FIELD_ERRORS] = self.error_list
return error_dict