simpler, just stick the relationship on ACA:
session = Session(engine)
print session.query(ConcreteConcreteAbstraction).filter(
ConcreteConcreteAbstraction.something.has(id=1)).all()
AbstractConcreteAbstraction.something = relationship(Something)
print session.query(AbstractConcreteAbstraction).filter(
AbstractConcreteAbstraction.something.has(id=1)).all()
On Feb 27, 2013, at 9:41 PM, Michael Bayer <mike...@zzzcomputing.com> wrote:
> just features that weren't anticipated (I never use concrete inheritance).
> here's what will work for now.
>
> class AbstractConcreteAbstraction(AbstractConcreteBase, sqlite):
> __table_args__ = (UniqueConstraint('derpa',
> 'derp'),)
> id = Column(Integer, primary_key=True)
> derpa = Column(Integer)
> derp = Column(Integer)
>
> @declared_attr
> def something_id(cls):
> return Column(ForeignKey(Something.id))
>
> class ConcreteConcreteAbstraction(AbstractConcreteAbstraction):
> __tablename__ = u'cca'
> __mapper_args__ = {'polymorphic_identity': 'ccb',
> 'concrete': True}
>
> something = relationship(Something)
>
> import sqlalchemy
> sqlalchemy.orm.configure_mappers()
>
> AbstractConcreteAbstraction.something = relationship(Something)
>
> sqlite.metadata.create_all()
>
> # Works
> print session.query(ConcreteConcreteAbstraction).filter(
> ConcreteConcreteAbstraction.something.has(id=1)).all()
> # Don't work
> print session.query(AbstractConcreteAbstraction).filter(
> AbstractConcreteAbstraction.something.has(id=1)).all()
>
>
>
> On Feb 27, 2013, at 8:06 PM, Derek Litz <litzoma...@gmail.com> wrote:
>
>> Having fun with AbstractBaseClasses tonight :) ... Anyways am I missing
>> something here as well?
>>
>> I tried playing with querying the AbstractBaseClass and filtering on sub
>> classes but that just produced
>> a query that did not execute.
>>
>> from sqlalchemy.engine import Engine
>> from sqlalchemy import event
>> from sqlalchemy import (Column, Integer, Unicode, DateTime, ForeignKey,
>> Boolean, Numeric, Time)
>>
>>
>> # Taken from http://docs.sqlalchemy.org/ru/latest/dialects/sqlite.html
>> @event.listens_for(Engine, "connect")
>> def set_sqlite_pragma(dbapi_connection, connection_record):
>> cursor = dbapi_connection.cursor()
>> cursor.execute("PRAGMA foreign_keys=ON")
>> cursor.close()
>>
>>
>> from sqlalchemy import create_engine
>> from sqlalchemy.ext.declarative import (declarative_base, declared_attr,
>> AbstractConcreteBase)
>> from sqlalchemy.orm import sessionmaker, relationship, backref,
>> object_session
>>
>> engine = create_engine('sqlite:///test.db')
>> sqlite = declarative_base(bind=engine)
>> get_session = sessionmaker(bind=engine)
>> session = get_session()
>>
>> from sqlalchemy.schema import UniqueConstraint
>>
>>
>> class Something(sqlite):
>> __tablename__ = u'something'
>> id = Column(Integer, primary_key=True)
>>
>>
>> class AbstractConcreteAbstraction(AbstractConcreteBase, sqlite):
>> __table_args__ = (UniqueConstraint('derpa',
>> 'derp'),)
>> id = Column(Integer, primary_key=True)
>> derpa = Column(Integer)
>> derp = Column(Integer)
>>
>> @declared_attr
>> def something_id(cls):
>> return Column(ForeignKey(Something.id))
>>
>> @declared_attr
>> def something(cls):
>> return relationship(Something)
>>
>>
>> class ConcreteConcreteAbstraction(AbstractConcreteAbstraction):
>> __tablename__ = u'cca'
>> __mapper_args__ = {'polymorphic_identity': 'ccb',
>> 'concrete': True}
>>
>>
>> import sqlalchemy
>> sqlalchemy.orm.configure_mappers()
>> sqlite.metadata.create_all()
>>
>> # Works
>> print session.query(ConcreteConcreteAbstraction).filter(
>> ConcreteConcreteAbstraction.something.has(id=1)).all()
>> # Don't work
>> print session.query(AbstractConcreteAbstraction).filter(
>> AbstractConcreteAbstraction.something.has(id=1)).all()
>>
>>
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>>
>
>
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