Suppose I have two classes of objects which have a reference to each
other:

Class A:
b

Class B:
a

Both references are mandatory so nullable = False
I use post_update = True in relation function and use_alter = True in
ForeignKey constructor

After it I try to add two objects:

session = Session()
a = A()
b = B()
a.b = b
b.a = a
session.commit()

and catch an exception, because with post_update = True NULL inserted
in DB, but without post_update= True I can't add two circular
depending objects.

How to solve with situation to add such pair of objects into DB?


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