[Django]-Django Generic Relations with Django Admin

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Using generic relations in django is exactly that. A ForeignKey to ContentType (content_type) and an IntegerField to denote the instance id (object_id). These are useful if you don’t know which type of content the ForeignKey is pointing to. Since you know you’re targeting the Address model you want to use regular ForeignKey(Address) instead of generic relations.

In response to your comment

Actually its much easier to use ForeignKey since you don’t need to go through ContentType.

class Address(models.Model):
  street=models.CharField(max_length=100)
  city=models.CharField(max_length=100)


class Hospital(models.Model):
  name=models.CharField(max_length=100)
  created=models.DateTimeField()
  address=models.ForeignKey(Address, related_name="hospitals")

class Institution(models.Model):
  name=models.CharField(max_length=100)
  address=models.ForeignKey(Address, related_name="institutions")


>>> instance=Institution.objects.get(id=1)
>>> instance.address.city
>>> address=Address.objects.get(id=1)
>>> address.institutions.all() 
>>> address.hospitals.all()

Are your models going to share addresses? i.e. Can a Hospital and an Institution and perhaps a UserProfile all point to the same address instance? Or is it more likely that each will have it’s own address? I am trying to understand why you’ve created a separate class Address. If it’s to avoid retyping the same fields into each class you could use an abstract model class and subclass it. Or you might be needing a OneToOneField which is a two way pointer between the two instances.

👤czarchaic

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