Solved: ForeignKey on delete django

contrib.auth

If a ForeignKey is deleted in Django, any associated records in the database will be deleted as well.

-models foreign-key cascade I have a model with a ForeignKey to another model. When the referenced model is deleted, I want the ForeignKey to be set to NULL. How can I do that? Read this post in context

Django - how to get all objects from one table which are not in another table? django I have two models: class Product(models.Model): name = models.CharField(max_length=255) price = models.DecimalField(decimal_places=2, max_digits=10) class OrderItem(models.Model): product = models.ForeignKey('Product', on_delete=models.CASCADE) quantity = models.IntegerField() def __str__(self): return self.product How can i get all products which are not in OrderItem? Read this post in context

Django - how to create an object with a foreign key that doesn't exist yet django I am trying to create an object with a foreign key that doesn't exist yet (the user). The user will be created after the object is created and then it will be assigned as the foreign key for the object later on when it exists (in another view). This is my code: def add_to_cart(request, pk): product = get_object_or_404(Product, pk=pk) orderitem, created = OrderItem.objects ... Read this post in context

Django – how to create an object with a foreign key that doesn’t exist yet django I am trying to create an object with a foreign key that doesn’t exist yet (the user). The user will be created after the object is created and then it will be assigned as the foreign key for the object later on when it exists (in another view). This is my code: def add_to_cart(request, pk): product = get_object_or_404(Product, pk=pk) orderitem, created = OrderItem.objects … Read this post in context

Django – how to create an object with a foreign key that doesn’t exist yet django I am trying to create an object with a foreign key that doesn’t exist yet (the user). The user will be created after the object is created and then it will be assigned as the foreign key for the object later on when it exists (in another view). This is my code: def add_to_cart(request, pk): product = get_object_or_404(Product, pk=pk) orderitem, created = OrderItem.objects … Read this post in context

How can I make Django use my own custom password hashing algorithm? django I want Django to use my own custom password hashing algorithm instead of its default one. How can I do this? Read this post in context

What is ForeignKey

A ForeignKey is a model field that references a model in another model.

on_delete options

There are a few different options for handling deletes in Django. The simplest option is to use the delete() function:

delete(object)

This will delete the object from the database and any associated data. If the object is a model instance, it will also invalidate any associated fields.

Another option is to use the destroy() function:

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