Django informes de campo relación genérica que todos () está consiguiendo argumento inesperado palabra clave cuando no se pasan argumentos

Question

I tiene un modelo que puede ser unido a a otros modelos.

class Attachable(models.Model):
    content_type = models.ForeignKey(ContentType)
    object_pk = models.TextField()
    content_object = generic.GenericForeignKey(ct_field="content_type", fk_field="object_pk")

    class Meta:
        abstract = True

class Flag(Attachable):
    user = models.ForeignKey(User)
    flag = models.SlugField()
    timestamp = models.DateTimeField()

Estoy creando una relación genérica a este modelo en otro modelo.

flags = generic.GenericRelation(Flag)

Intento conseguir los objetos de esta relación genérica de este modo:

self.flags.all()

Esto resulta en la siguiente excepción:

>>> obj.flags.all()        
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/local/lib/python2.6/dist-packages/django/db/models/manager.py", line 105, in all
    return self.get_query_set()                                                              
  File "/usr/local/lib/python2.6/dist-packages/django/contrib/contenttypes/generic.py", line 252, in get_query_set
    return superclass.get_query_set(self).filter(**query)                                                         
  File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 498, in filter                    
    return self._filter_or_exclude(False, *args, **kwargs)                                                        
  File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 516, in _filter_or_exclude        
    clone.query.add_q(Q(*args, **kwargs))                                                                         
  File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/query.py", line 1675, in add_q                
    can_reuse=used_aliases)                                                                                       
  File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/query.py", line 1569, in add_filter           
    negate=negate, process_extras=process_extras)                                                                 
  File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/query.py", line 1737, in setup_joins          
    "Choices are: %s" % (name, ", ".join(names)))                                                                 
FieldError: Cannot resolve keyword 'object_id' into field. Choices are: content_type, flag, id, nestablecomment, object_pk, timestamp, user
>>> obj.flags.all(object_pk=obj.pk)
Traceback (most recent call last):
  File "<console>", line 1, in <module>
TypeError: all() got an unexpected keyword argument 'object_pk'

Lo que he hecho mal?

Answer 1

Es necesario definir object_id_field y content_type_field al crear GenericRelation:

flags = generic.GenericRelation(Flag, object_id_field="object_pk", content_type_field="content_type")