How to use dynamic foreignkey in Django ?

Question

hey,

i want to use 2 model in one foreignkey

it means;

i have 2 model named screencasts and articles. and i have a fave model, for favouriting this model entrys. can i use model dynamicly ?

class Articles(models.Model):
    title = models.CharField(max_length=100)
    body = models.TextField()

class Casts(models.Model):
    title = models.CharField(max_length=100)
    body = models.TextField()

class Faves(models.Model):
    post = models.ForeignKey(**---CASTS-OR-ARTICLES---**)
    user = models.ForeignKey(User,unique=True)

is it possible ?

Answer 1

Here is how I do it:

from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic


class Photo(models.Model):
    picture = models.ImageField(null=True, upload_to='./images/')
    caption = models.CharField(_("Optional caption"),max_length=100,null=True, blank=True)

    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField()
    content_object = generic.GenericForeignKey('content_type', 'object_id')

class Article(models.Model):
    ....
    images     = generic.GenericRelation(Photo)

You would add smthg like

    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField()
    content_object = generic.GenericForeignKey('content_type', 'object_id')

to Faves and generic.GenericRelation(Faves) to Article and Cast

contenttypes docs

Answer 2

Here's an approach. (Note that the models are singular, Django automatically pluralizes for you.)

class Article(models.Model):
    title = models.CharField(max_length=100)
    body = models.TextField()

class Cast(models.Model):
    title = models.CharField(max_length=100)
    body = models.TextField()

FAVE_CHOICES = ( 
    ('A','Article'),
    ('C','Cast'),
)
class Fave(models.Model):
    type_of_fave = models=CharField( max_length=1, choices=FAVE_CHOICES )
    cast = models.ForeignKey(Casts,null=True)
    article= models.ForeigKey(Articles,null=True)
    user = models.ForeignKey(User,unique=True)

This rarely presents profound problems. It may require some clever class methods, depending on your use cases.