How do I create foreign keys in Django migrations?

How do I create foreign keys in Django migrations?

To create foreign keys in Django migrations, you can use the ForeignKey field in your model definition.

Can you show me an example of how to define a ForeignKey in a model?

Sure! Here's an 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)

This creates a foreign key relationship between Book and 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 will delete all related Book instances if the Author is deleted.

How do I create a migration after adding a ForeignKey?

You can create a migration by running python manage.py makemigrations in your terminal. This will generate a migration file for your changes.