How can I get a list of all the model objects that have a ForeignKey pointing to an object? (Something like the delete confirmation page in the Django admin before DELETE CASCADE).
I'm trying to come up with a generic way of merging duplicate objects in the database. Basically I want all of the objects that have ForeignKeys points to object "B" to be updated to point to object "A" so I can then delete "B" without losing anything important.
Thanks for your help!
This gives you the property names for all related objects:
links = [rel.get_accessor_name() for rel in a._meta.get_all_related_objects()]
You can then use something like this to get all related objects:
for link in links: objects = getattr(a, link).all() for object in objects: # do something with related object instance
I spent a while trying to figure this out so I could implement a kind of "Observer Pattern" on one of my models. Hope it's helpful.
_meta.get_fields(): https://docs.djangoproject.com/en/1.10/ref/models/meta/#django.db.models.options.Options.get_fields (see reverse in the
_get_fields() source also)
@digitalPBK was close... here is probably what you are looking for using Django's built in stuff
from django.db.models.deletion import Collector from django.contrib.admin.util import NestedObjects collector = NestedObjects(using="default") #database name collector.collect([objective]) #list of objects. single one won't do print collector.data
this allows you to create what the django admin displays - the related objects to be deleted.