Custom encoder/decoder classes

[ChillyBwoy]

serialize_instance function from provider.utils uses default DjangoJSONEncoder, which cannot serilaize model with custom fields. It would be better if one can specify encoder/decoder classnames in settings module.

Example:

...
from imagekit.models import ImageSpecField
from imagekit.processors import ResizeToFill, ResizeCanvas, Anchor


class User(BaseUser):
    registered_at = models.DateTimeField(auto_now_add=True)
    tags = models.ManyToManyField('core.Tag', through='core.TagLike')
    avatar = models.ImageField(upload_to=upload_to('users'),
                               blank=True, null=True)
    avatar_square = ImageSpecField(source='avatar', format='JPEG',
                                   processors=[
                                   ResizeToFill(300, 300),
                                   ResizeCanvas(300, 300,
                                                anchor=Anchor.CENTER)],
                                   options={'quality': 75})
    avatar_square_s = ImageSpecField(source='avatar', format='JPEG',
                                     processors=[
                                     ResizeToFill(100, 100),
                                     ResizeCanvas(100, 100,
                                                  anchor=Anchor.CENTER)],
                                     options={'quality': 90})
...

Trace

Environment:


Request Method: POST
Request URL: http://localhost:8000/oauth2/authorize/confirm

Django Version: 1.6.7
Python Version: 2.7.8
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.staticfiles',
 'south',
 'imagekit',
 'django_babel',
 'social.apps.django_app.default',
 'pamphlet',
 'pamphlet_images',
 'pamphlet_tags',
 'pamphlet_grid',
 'pamphlet_auth',
 'pamphlet_admin',
 'itsmywine.apps.accounts',
 'itsmywine.apps.core',
 'itsmywine.apps.static_pages',
 'itsmywine.packages.text',
 'itsmywine.packages.images',
 'itsmywine.packages.pattern',
 'itsmywine.packages.custom',
 'itsmywine.packages.shop',
 'rest_framework',
 'provider',
 'provider.oauth2',
 'debug_toolbar')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'debug_toolbar.middleware.DebugToolbarMiddleware')


Traceback:
File "/usr/local/var/virtualenvs/itsmywine/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  112.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/var/virtualenvs/itsmywine/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
  22.                 return view_func(request, *args, **kwargs)
File "/usr/local/var/virtualenvs/itsmywine/lib/python2.7/site-packages/django/views/generic/base.py" in view
  69.             return self.dispatch(request, *args, **kwargs)
File "/usr/local/var/virtualenvs/itsmywine/lib/python2.7/site-packages/provider/views.py" in dispatch
  41.         response = super(OAuthView, self).dispatch(request, *args, **kwargs)
File "/usr/local/var/virtualenvs/itsmywine/lib/python2.7/site-packages/django/views/generic/base.py" in dispatch
  87.         return handler(request, *args, **kwargs)
File "/usr/local/var/virtualenvs/itsmywine/lib/python2.7/site-packages/provider/views.py" in post
  285.         return self.handle(request, request.POST)
File "/usr/local/var/virtualenvs/itsmywine/lib/python2.7/site-packages/provider/views.py" in handle
  277.         self.cache_data(request, client.serialize(), "client")
File "/usr/local/var/virtualenvs/itsmywine/lib/python2.7/site-packages/provider/oauth2/models.py" in serialize
  56.         return dict(user=serialize_instance(self.user),
File "/usr/local/var/virtualenvs/itsmywine/lib/python2.7/site-packages/provider/utils.py" in serialize_instance
  81.     return json.loads(json.dumps(ret, cls=DjangoJSONEncoder))
File "/usr/local/Cellar/python/2.7.8_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/__init__.py" in dumps
  250.         sort_keys=sort_keys, **kw).encode(obj)
File "/usr/local/Cellar/python/2.7.8_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/encoder.py" in encode
  207.         chunks = self.iterencode(o, _one_shot=True)
File "/usr/local/Cellar/python/2.7.8_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/encoder.py" in iterencode
  270.         return _iterencode(o, 0)
File "/usr/local/var/virtualenvs/itsmywine/lib/python2.7/site-packages/django/core/serializers/json.py" in default
  104.             return super(DjangoJSONEncoder, self).default(o)
File "/usr/local/Cellar/python/2.7.8_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/encoder.py" in default
  184.         raise TypeError(repr(o) + " is not JSON serializable")

Exception Type: TypeError at /oauth2/authorize/confirm
Exception Value: <ImageFieldFile: uploads/users/1406301951.e25eee345552ad7736f1bae3f3c0819c.jpg> is not JSON serializable