<StdImageFieldFile: None> is not JSON serializable - serialization

Question

I'm using django-stdimage for uploading and resizing images, and it works well.
I'm having a problem, though, with django-allauth; when I try to login with the social account, and there already is a normal account with the same e-mail address, I'm getting the following error:
TypeError at /accounts/facebook/login/callback/
is not JSON serializable
This is the full traceback:
Environment:
Request Method: GET
Request URL: http://localhost:8000/accounts/facebook/login/callback/?code=AQCf7MjgfOAsqf0sS0gup0hqLKyZClQvkGKyWtkORNBru_ITaRNHKgxwaH5RaCSARIb9U1ZgnqhWm3OQAfKW1r5nbVRkKr4fcLWtXdGL85-LYIyuF-NftkJpIhdIMR-VTMF8XXbKescZhxz0hDP_eKl1tKL6uPqWKc8NliWWHh9kOYSS69rAzNRUjZhgx6Zul9sAkV9nRoDo-JunhDRtvOV3crnpr9zAU6jsPDChcJ5dgcRPQ39EoOhrDE16-ia6WF1lFMz_fw1Pgjvo-2jduNG-c9TPyY23A205wm3d1PItoXH2U4GU8j1u5iAg1OIJuvDh-2viQA1disQoM_Du3vUldbX4Plun-yNay2kzNepOyw&state=0J6Ydn3lDKi0
Django Version: 1.8
Python Version: 2.7.6
Installed Applications:
('django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.sites',
'blog',
'custom_user',
'django_markdown',
'storages',
'parsley',
'stdimage',
'stdimage_serializer',
'rest_framework',
'allauth',
'allauth.account',
'allauth.socialaccount',
'allauth.socialaccount.providers.facebook')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.middleware.security.SecurityMiddleware')
Traceback:
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/allauth/socialaccount/providers/oauth2/views.py" in view
62. return self.dispatch(request, *args, **kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/allauth/socialaccount/providers/oauth2/views.py" in dispatch
135. return complete_social_login(request, login)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/allauth/socialaccount/helpers.py" in complete_social_login
145. return _complete_social_login(request, sociallogin)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/allauth/socialaccount/helpers.py" in _complete_social_login
161. ret = _process_signup(request, sociallogin)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/allauth/socialaccount/helpers.py" in _process_signup
26. request.session['socialaccount_sociallogin'] = sociallogin.serialize()
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/allauth/socialaccount/models.py" in serialize
198. user=serialize_instance(self.user),
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/allauth/utils.py" in serialize_instance
194. return json.loads(json.dumps(data, cls=DjangoJSONEncoder))
File "/usr/lib/python2.7/json/__init__.py" in dumps
250. sort_keys=sort_keys, **kw).encode(obj)
File "/usr/lib/python2.7/json/encoder.py" in encode
207. chunks = self.iterencode(o, _one_shot=True)
File "/usr/lib/python2.7/json/encoder.py" in iterencode
270. return _iterencode(o, 0)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/core/serializers/json.py" in default
112. return super(DjangoJSONEncoder, self).default(o)
File "/usr/lib/python2.7/json/encoder.py" in default
184. raise TypeError(repr(o) + " is not JSON serializable")
Exception Type: TypeError at /accounts/facebook/login/callback/
Exception Value: <StdImageFieldFile: None> is not JSON serializable
I can't understand if it's a django-allauth problem or something else.
This is models.py:
class CustomUser(AbstractBaseUser, PermissionsMixin):
first_name = models.CharField(max_length=254, blank=True)
second_name = models.CharField(max_length=254, blank=True)
email = models.EmailField(blank=True, unique=True)
date_joined = models.DateTimeField(_('date joined'), default=datetime.now())
#avatar = models.ImageField('profile picture', upload_to=upload_avatar_to, null=True, blank=True)
avatar = StdImageField(upload_to=upload_avatar_to, null=True, blank=True,
variations={
'thumbnail': {'width': 250, 'height': 250, "crop": True}
})
is_active = models.BooleanField(default=False)
is_admin = models.BooleanField(default=False)
is_staff = models.BooleanField(default=False)
USERNAME_FIELD = 'email'
REQUIRED_FIELDS = ['first_name', 'second_name']
objects = CustomUserManager()
class Meta:
verbose_name = _('user')
verbose_name_plural = _('users')
def save(self, *args, **kwargs):
super(CustomUser, self).save(*args, **kwargs)
def get_absolute_url(self):
return "/users/%s" % urlquote(self.email)
def get_full_name(self):
"""
Returns the first_name plus the last_name, with a space in between.
"""
return self.email
def __str__(self):
return self.email
def get_short_name(self):
"""
Returns the first name for the user.
"""
return self.first_name
def email_user(self, subject, message, from_email=None):
"""
Sends an email to this user.
"""
send_email(subject, message, from_email, [self.email])
I've also tried to use django-stdimage-serializer, but when I try to set up the models file with it, and fire up makemigrations, that's what I get:
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
utility.execute()
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 312, in execute
django.setup()
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/__init__.py", line 18, in setup
apps.populate(settings.INSTALLED_APPS)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate
app_config.import_models(all_models)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/apps/config.py", line 198, in import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/home/stefano/projects/blog-project/blog/models.py", line 6, in <module>
from custom_user.models import CustomUserManager, CustomUser
File "/home/stefano/projects/blog-project/custom_user/models.py", line 52, in <module>
class CustomUser(AbstractBaseUser, PermissionsMixin):
File "/home/stefano/projects/blog-project/custom_user/models.py", line 60, in CustomUser
'thumbnail': {'width': 250, 'height': 250, "crop": True}
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/rest_framework/fields.py", line 1405, in __init__
super(ImageField, self).__init__(*args, **kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/rest_framework/fields.py", line 1359, in __init__
super(FileField, self).__init__(*args, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'upload_to'
What could I do?

Answer 1

If anyone is interested, this answer is exactly what I was looking for.