#27149: Filtering with generic relation
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Reporter: MikiSoft | Owner: nobody
Type: New feature | Status: new
Component: Database layer (models, ORM) | Version:
Severity: Normal | Keywords: QuerySet.extra
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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The following function is used for filtering by generic relation (and also
by one column in the model where it is) which isn't natively supported by
Django.
{{{
def generic_rel_filter(model, target, column, id):
return model.objects.extra(where=['''
{app_label}_{model}.id in (select object_id
from {app_label}_{target}
where content_type_id = (select id from django_content_type where
model = '{model}')
and {column} =
{id})'''.format(app_label=os.path.basename(os.path.dirname(__file__)),
model=model.__name__.lower(), target=target, column=column, id=id)])
}}}
''Example:'' If I have Event and Like model, and the second one has
generic relation to the first one (i.e. it has `content_type`, `object_id`
and `content_object` fields), then if I want to get all events which
current user liked, I would just make this call in a view:
`generic_rel_filter(Event, 'like', 'person', self.request.user.pk)`
'''Note that this function isn't intended to be used with user specified
parameters, otherwise it's prone to SQL injection attacks.'''
--
Ticket URL: <https://code.djangoproject.com/ticket/27149>
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