Hi everybody!
Is there a way to use primary_join with back_populates in the following
case?
I have two entities (sorry, I may be wrong with the exact syntax):
class User(Base):
id = sa.Column(sa.Integer, primary_key=True)
billing_addresses = relationship('Address',
primary_join='User.id==Address.id, Address.is_billing.is_(True)',
uselist=True)
shipping_addresses = relationship('Address',
primary_join='User.id==Address.id, Address.is_billing.is_(False)',
uselist=True)
class Address(Base):
id = sa.Column(sa.Integer, primary_key=True)
is_billing = sa.Column(sa.Boolean) # Let it be a discriminator for
whether it's a billing or shipping
user_id = sa.Column(sa.Integer, sa.ForeignKey('User.id'), nullable=False)
user = relationship(User)
I had to add uselist=True explicitly, but that's not a problem.
When I try to add back_populates('user') to User.billing_addresses and
User.shipping_addresses relationships, I get the error:
User.billing_addresses and back-reference Address.user are both of the same
direction <symbol 'ONETOMANY>. Did you mean to set remote_side on the
many-to-one side?
Could you help me what and where I should fix?
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