Django- Get Foreign Key Model

Question

How can I Get A Foreign Key Model Type?

For Example:

class Category(models.Model):
    name = models.CharField(max_length = 100)

class SubCategory(models.Model):
    category = models.ForeignKey(Category)
    title = models.CharField(max_length = 100)

I Want To Get category Model In SubCategory.

How Can I Do It?

Answer 1

ForeignKeys are ReverseSingleRelatedObjectDescriptor objects. So that's what you are really working with. You'll get that if you run type(SubCategory.category). From here you can use two ways to get the actual Class/Model referred to.

SubCategory.category.field.rel.to  # <class 'path.to.Model'>
SubCategory.category.field.rel.to.__name__  # 'Category'

# or these will do the same thing

SubCategory._meta.get_field('category').rel.to
SubCategory._meta.get_field('category').rel.to.__name__

If you don't know the attribute name until run-time, then use getattr(SubCategory, attributeNameVariable) to get your ReverseSingleRelatedObjectDescriptor object for that ForeignKey field.

Answer 2

For Django>=2.0

>>> SubCategory._meta.get_field('category').remote_field.model
>>> 'my_app.models.Category'

To get the model name use the __name__ class property.

>>> SubCategory._meta.get_field('category').remote_field.model.__name__ 
>>> 'Category'

Answer 3

also for django > = 2.0

>>> SubCategory._meta.get_field('category').related_model
>>> <class 'my_app.models.Category'>
>>> SubCategory._meta.get_field('category').related_model._meta.model_name
>>> 'category'

Answer 4

Try:

subcategory = SubCategory.objects.get(pk=given_pk)
subcategory.category

EDIT:

subcategory._meta.get_field('category').rel.to