from django.http import HttpResponse
from django.utils.functional import Promise
from django.utils.translation import force_unicode
from django.utils.simplejson import JSONEncoder

class LazyJSONEncoder(JSONEncoder):
    def default(self, o): 
        if isinstance(o, Promise):
            return force_unicode(o)
        else:
            return super(LazyJSONEncoder, self).default(o)

class JsonResponse(HttpResponse):
    def __init__(self, data, mimetype='application/json'):
        json_data = LazyJSONEncoder().encode(data)
        super(JsonResponse, self).__init__(
            content=json_data, mimetype=mimetype)