django-multiforeignkey
Django ForeignKey that links to one of several specified models:
class Comment(models.Model):
user = models.ForeignKey(User)
text = models.TextField()
# users may leave comments for blog posts, articles or votings
object = MultiForeignKey(Post, Article, Voting)Unlike GenericForeignKey, the field uses native database foreign keys and provides maximum speed and reliability.
WARNING
This is a preliminary alpha version which most probably doesn't fully work as advertised. I had to publish it unfinished because I had to use it in my project.
Installation
pip install django-multiforeignkey
Usage
Add multiforeignkey to INSTALLED_APPS:
# settings.py
INSTALLED_APPS = [
...
'multiforeignkey',
]Add a field to your models:
# comments/models.py
from multiforeignkey.models import MultiForeignKey
class Comment(models.Model):
user = models.ForeignKey(User)
text = models.TextField()
# users may leave comments for blog posts, articles or votings
object = MultiForeignKey(Post, Article, Voting)Create the corresponding database tables:
./manage.py makemigrations && ./manage.py migrateUse the new field as if it were a real database field:
comment = Comment.objects.filter(object=post)
assert comment.object is post
comment.object = voting
assert comment.object is voting
comment.save()or use specific subfields:
comment = Comment.objects.filter(post=post)
assert comment.post is post
assert comment.article is None
assert comment.voting is None
comment.voting = voting
assert comment.post is None
assert comment.article is None
assert comment.voting is voting
comment.save()
