'UserManager' object has no attribute 'raw_query' - django

Question

nonrel(Mongodb) with tastypie.I have created one resource class which return selected auth_user from the database.Because of some reasons I did change _id field type from ObjectId to Int64.I used raw_query() for accessing desired auth_user but it doesn't seems to work.Can anyone suggest me what should I do to make raw_query() work for UserModel.
Here is my tastypie resource:
class UserResource(ModelResource):
class Meta:
queryset=User.objects.raw_query({'_id':5})
resource_name="user"
fields=["username","first_name","last_name"]
include_resource_uri=False
allowed_methods=["get"]
output:
'UserManager' object has no attribute 'raw_query'

Answer 1

I myself workaround to this problem and for the sake of others help I am answering my own question.Hope this will help someone.
This solution is to create a proxy model.By declaring proxy models we can do opertions on parent model and even can modify manager.
proxy model:
class UserClass(User):
objects = MongoDBManager()
class Meta:
proxy=True
Resource:
class UserResource(ModelResource):
class Meta:
queryset=UserClass.objects.raw_query({'_id':5})
resource_name="user"
fields=["username","first_name","last_name"]
include_resource_uri=False
allowed_methods=["get"]

Answer 2

This is not related to Tastypie at all. Are you sure you need a raw query, or is the above just an example?
By looking at the docs you should be able to do the following:
from django_mongodb_engine.contrib import MongoDBManager
class User(models.Model):
mongo_manager = MongoDBManager()
Then you should be able to use it as you do above, i.e:
queryset=User.mongo_manager.raw_query({'_id':5})