Snippet

Defining ForeignKey Relationships

ForeignKeys establish a many-to-one relationship. The on_delete parameter determines what happens to the post if its category is deleted.

snippet.py

python

from django.db import models
 
class BlogPost(models.Model):
    category = models.ForeignKey('Category', on_delete=models.CASCADE)

django

Breakdown

models.ForeignKey('Category', ...)

Links the current model to another model named 'Category'.

on_delete=models.CASCADE

Ensures that if a Category is deleted, all related BlogPosts are also automatically deleted.