AttributeError: 'QuerySet' object has no attribute 'model'

[jonasli]

The code is simple:

Models.py

from future import unicode_literals

from mongoengine import *

connect('test',alias='default')

class user(Document):

email = StringField(required=True)  

first_name = StringField(max_length=50) 
last_name = StringField(max_length=50) 

class Comment (EmbeddedDocument):
content=StringField()
name=StringField(max_length=120)

class Post(Document):
title=StringField(max_length=120, required=True)
author = ReferenceField(user,reverse_delete_rule=CASCADE)
tags=ListField(StringField(max_length=30))
comments=ListField(EmbeddedDocumentField(Comment))
meta={'allow_inheritance':True}

class TextPost(Post):
content = StringField()

class ImagePost(Post):
image_path=StringField()

class LinkPost(Post):
link_url=StringField()

---

BlogModelResources.py

from tastypie.resources import ModelResource
from blog.models import user

class UserResource(ModelResource):
class Meta:
queryset = user.objects.all()

Django (1.10.1)
django-filter (1.0.1)
django-rest-framework-mongoengine (3.3.1)
django-tastypie (0.13.3)
django-tastypie-mongoengine (0.4.6)
djangorestframework (3.5.3)
pymongo (3.4.0)

I always got the error message:

Unhandled exception in thread started by <function wrapper at 0xb618caac>
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/django/utils/autoreload.py", line 226, in wrapper
fn(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/runserver.py", line 121, in inner_run
self.check(display_num_errors=True)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 374, in check
include_deployment_checks=include_deployment_checks,
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 361, in _run_checks
return checks.run_checks(**kwargs)
File "/usr/local/lib/python2.7/dist-packages/django/core/checks/registry.py", line 81, in run_checks
new_errors = check(app_configs=app_configs)
File "/usr/local/lib/python2.7/dist-packages/django/core/checks/urls.py", line 14, in check_url_config
return check_resolver(resolver)
File "/usr/local/lib/python2.7/dist-packages/django/core/checks/urls.py", line 24, in check_resolver
for pattern in resolver.url_patterns:
File "/usr/local/lib/python2.7/dist-packages/django/utils/functional.py", line 35, in get
res = instance.dict[self.name] = self.func(instance)
File "/usr/local/lib/python2.7/dist-packages/django/urls/resolvers.py", line 313, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/usr/local/lib/python2.7/dist-packages/django/utils/functional.py", line 35, in get
res = instance.dict[self.name] = self.func(instance)
File "/usr/local/lib/python2.7/dist-packages/django/urls/resolvers.py", line 306, in urlconf_module
return import_module(self.urlconf_name)
File "/usr/lib/python2.7/importlib/init.py", line 37, in import_module
import(name)
File "/home/jonas/django/mysite/mysite/urls.py", line 22, in
url(r'^blog/', include('blog.urls',namespace="blog")),
File "/usr/local/lib/python2.7/dist-packages/django/conf/urls/init.py", line 50, in include
urlconf_module = import_module(urlconf_module)
File "/usr/lib/python2.7/importlib/init.py", line 37, in import_module
import(name)
File "/home/jonas/django/mysite/blog/urls.py", line 5, in
from .api.BlogModelResources import UserResource
File "/home/jonas/django/mysite/blog/api/BlogModelResources.py", line 4, in
class UserResource(ModelResource):
File "/usr/local/lib/python2.7/dist-packages/tastypie/resources.py", line 1769, in new
setattr(meta, 'object_class', meta.queryset.model)
## AttributeError: 'QuerySet' object has no attribute 'model'

can you please help on this?
thank you very much,
Jonas