How to use dynamic foreignkey in Django?

Question

I want to connect a single ForeignKey to two different models.

For example:

I have two models named Casts and Articles

Answer 1

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.