Django JOIN query without foreign key

Question

Is there a way in Django to write a query using the ORM, not raw SQL that allows you to JOIN on another table without there being a foreign key? Looking through the documentatio

Answer 1

The Django ForeignKey is different from SQL ForeignKey. Django ForeignKey just represent a relation, it can specify whether to use database constraints.

Try this:

request_url = models.ForeignKey(UserActivityLink, to_field='url_description', null=True, on_delete=models.SET_NULL, db_constraint=False)

Note that the db_constraint=False is required, without it Django will build a SQL like:

ALTER TABLE `user_activity` ADD CONSTRAINT `xxx` FOREIGN KEY (`request_url`) REFERENCES `user_activity_link` (`url_description`);" 

I met the same problem, after a lot of research, I found the above method.

Hope it helps.