Background:
I have a two model classes where one is a parent of the other via a one to
many relationship. The parent has a collection of the children with a
backref:
class Parent(base):
__tablename__ = "parent_table"
parent_key = Column(String, primary_key=True)
some_quantity = Column(Integer)
children = relationship("Parent", backref="parent_table")
class Child(base):
__tablename__ = "child_table"
child_key = Column(String, primary_key=True)
some_quantity = Column(Integer)
parent_key = Column(String, ForeignKey("parent_table.parent_key"))
I'm running into the following problem:
When I add a child to the parent collection, I have to make sure that the
sum of the
some_quantitiy
fields of all children on the same parent do not exceed the
some_quantity
field of the parent. I tried adding a validator like so:
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