you are missing and_():
billing_addresses = relationship('Address',
primary_join='and_(User.id==Address.id,
Address.is_billing.is_(True))', uselist=True)
On Tue, Feb 26, 2019 at 5:44 AM Pavel Pristupa <prist...@gmail.com> wrote:
>
> 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?
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
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--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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