Contenido del Curso
Django ORM Ninja: Técnicas Avanzadas para Desarrolladores
Django ORM Ninja: Técnicas Avanzadas para Desarrolladores
1. Introduction to Django ORM
2. Models, datatypes, and fields
ForeignKey Arguments
To define a Many-to-One relation, models.ForeignKey is used. The first argument corresponds to the model to relate to, and the second, 'on_delete', specifies the behavior when the related object is deleted. The options include:
- CASCADE: Deleting a genre deletes all associated books.
- PROTECT: Prevents deletion if there are related books.
- SET_NULL: Sets the genre to Null if null=True in model definition.
- SET_DEFAULT: Sets a default value if the genre is deleted if there available some default value.
- DO_NOTHING: No action, but may lead to IntegrityError.
The related_name argument in ForeignKey is useful for reverse relation from the Genre model back to Book model. If you don't specify a related_name, Django automatically creates one using the name of your model with the suffix _set (Genre.book_set.all()).
In our case works:
This structure provides a clear understanding of the Many-to-One relationship in Django, showcasing how to define and utilize it effectively.
1. What does 'models.ForeignKey' do in a Django model?
2. What happens when 'on_delete=models.CASCADE' is set in a ForeignKey relationship?
3. What is the purpose of the 'related_name' argument in a ForeignKey field?
¿Todo estuvo claro?
¡Gracias por tus comentarios!
Sección 4. Capítulo 2
