Bug fix

[Lord-Evil]

First time I'm trying to use MongoDB with Django.
Error in your module.. boom!

/usr/lib/python3.4/site-packages/djangotoolbox/db/base.py in _value_for_db_collection(self, value, field, field_kind, db_type, lookup)
    481                 # "list" may be used for SetField.
    482                 #print("Type: "+str(db_type))
--> 483                 if db_type in 'list':
    484                     return list(value)
    485                 elif db_type == 'set':

TypeError: 'in <string>' requires string as left operand, not NoneType

When trying to create ListField() in the model as per example.
3-4 hours of debugging step by step brought me to this solution:

class NonrelDatabaseWrapper(BaseDatabaseWrapper):
   data_types={'ListField':'list'}

Next step is to solve this crap:

/usr/lib/python3.4/site-packages/django/db/models/fields/__init__.py in get_prep_value(self, value)
    983         if value is None:
    984             return None
--> 985         return int(value)
    986 
    987     def contribute_to_class(self, cls, name, **kwargs):

TypeError: int() argument must be a string, a bytes-like object or a number, not 'ObjectId'

When saving the actual model.