How do I use foreign keys in Django ORM?

How do I use foreign keys in Django ORM?

In Django ORM, you can use foreign keys to create a relationship between two models. You define a foreign key in one model that points to another model.

Can you show me an example of how to define a foreign key?

Sure! Here's a simple example:

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

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

In this example, each book is linked to an author.

What does the on_delete parameter do?

The on_delete parameter specifies what should happen when the referenced object is deleted. For example, models.CASCADE means that when an author is deleted, all their books will also be deleted.

Can I have multiple foreign keys in a single model?

Yes, you can have multiple foreign keys in a single model. Just define each foreign key with a different field name.