On Jan 5, 2012, at 9:52 AM, Thijs Engels wrote:
> When going through the (excellent) documentation on relationsship I came
> across this example:
>
>
> from sqlalchemy import Integer, ForeignKey, String, Column
> from sqlalchemy.ext.declarative import declarative_base
> from sqlalchemy.orm import relationship
>
> Base = declarative_base()
>
> class User(Base):
> __tablename__ = 'user'
> id = Column(Integer, primary_key=True)
> name = Column(String)
>
> addresses = relationship("Address",
> primaryjoin="and_(User.id==Address.user_id, "
> "Address.email.startswith('tony'))",
> backref="user")
>
> class Address(Base):
> __tablename__ = 'address'
> id = Column(Integer, primary_key=True)
> email = Column(String)
> user_id = Column(Integer, ForeignKey('user.id'))
>
>
> What would be required to make this (User) addresses property a method
> with the startwith part a parameter? Can this be done using the
> relationship definitions? Or would it require a method with a explicit
> query in it (which would need the existance of a session)?
there's a path to doing this though not without it's complexities, described at:
http://www.sqlalchemy.org/trac/wiki/UsageRecipes/GlobalFilter
>
> Kind regards,
>
> Thijs
>
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