Opened 9 years ago

Last modified 9 years ago

#25354 closed New feature

Can't use related_query_name on an abstract base class — at Initial Version

Reported by: James Pulec Owned by: nobody
Component: Database layer (models, ORM) Version: 1.8
Severity: Normal Keywords:
Cc: Triage Stage: Accepted
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

It currently isn't possible to set related_query_name on a field on an abstract base class using the "%(class)s" or "%(app_label)s" string formatting syntax that is allowed for the related_name parameter of field. This is particularly problematic when trying to define an abstract base class that uses a GenericRelation, since you can't specify a related_name, but can specify a related_query_name.
For Example:

Code highlighting: 

class Child(models.Model):
    object_id = PositiveIntegerField()
    content_type = ForeignKey(ContentType)
    content_object = GenericForeignKey()


class GenericMixin(models.Model):
    relation = GenrericRelation(Child, related_query_name='%(class)s')

    class Meta:
        abstract = True


class Parent(GenericMixin):
    name = CharField()


instance = Child.objects.filter(parents__name)  # This query will not work, as 'parents' is not set as the related_query_name for the Parent Model

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