Yes, just a typo.
The actual problem is the following:
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?
среда, 27 февраля 2019 г., 1:03:40 UTC+7 пользователь Mike Bayer написал:
>
> 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 <[email protected]
> <javascript:>> 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
> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> description.
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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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