What are foreign key constraints in Django?
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What are foreign key constraints in Django?
Foreign key constraints in Django are rules that ensure the integrity of relationships between models. They enforce that a field in one model must correspond to a valid entry in another model.
How do I define a foreign key in my Django models?
You can define a foreign key in Django by using the ForeignKey field in your model. For example: author = models.ForeignKey(Author, on_delete=models.CASCADE).
What does the on_delete parameter do?
The on_delete parameter specifies what should happen to the related records when the referenced record is deleted. Common options include CASCADE, SET_NULL, and PROTECT.
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 field with a unique name.
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