[Answered ]-Concept of Foreign Key

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1👍

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When you create you B object you need to provide a reference to an A object.

You say you’re using a form to create the B object so you’ll probably need something along the lines of…

b_instance = new_b_form.save(commit=False)
b_instance.a = A.objects.get(something="whatever")  # You'll know how to find the A object you want related.
b_instance.save()

Setting a will automatically set a_id to be saved in the database.

Alternatively you may be able to change your form so that the user can select the A object.

👤Stephen Paulger

1👍

You should allow the model B FK field to be empty (null=True, blank=True) if you want to save it without reference to model A i.e. if FK is Null.
Otherwise you will have to feed the B object with A object and then to save it.

👤Ilian Iliev

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