That worked, Thanks, ITS AWESOME :-)
On Sep 17, 6:03 am, Conor <conor.edward.da...@gmail.com> wrote:
> On Sep 15, 11:03 pm, Jarrod Chesney <jarrod.ches...@gmail.com> wrote:
>
> > Hi All
> > I've been reading the documentation for ages and i can't figure out
> > why when i print the results a query from my inherited table, It just
> > prints them as the base type.
>
> > I was hoping someone here would be nice enough to help me solve this
> > problem.
>
> > I thought the last print statement would print an instance of the
> > _UtConfReconcilerActionSnapshot class but it doesn't
>
> > I've got one record in both tables and 'id' = 1 in each table.
> > What am i doing wrong?
>
> You are missing "polymorphic_on" in
> _UtConfReconcilerActions.__mapper_args__. Without this, SQLAlchemy
> cannot do polymorphic loads. Try this as your __mapper_args__:
> {'polymorphic_on': 'object_type', 'with_polymorphic': '*'}
>
> Hope it helps,
> -Conor
>
>
>
> > <<<<<<<<<<< Begin code >>>>>>>>>>>>>
>
> > from sqlalchemy import Table, Column, Integer, String, MetaData,
> > ForeignKey, CheckConstraint
> > from sqlalchemy.orm import relation
> > from sqlalchemy.ext.declarative import declarative_base
> > from sqlalchemy import create_engine
> > from sqlalchemy.orm import sessionmaker
>
> > __DATABASE_NAME__='UtConfSom.sqlite'
>
> > Base = declarative_base()
>
> > # ============================== Reconciler Actions
> > ===========================
>
> > class _UtConfReconcilerActions(Base):
>
> > __tablename__ = 'tblReconcilerActions'
> > __mapper_args__ = {'with_polymorphic': '*'}
>
> > # 1 to Many relationship to the managed
> > id = Column(Integer, primary_key=True)
> > action = Column(String, CheckConstraint("action in ('SNAPSHOT',
> > 'COMPARE', 'UPGRADE')"))
> > object_type = Column(String, CheckConstraint("object_type in ('ALL',
> > 'SCHEMA', 'TABLE', 'COLUMN', 'INDEX')"))
>
> > def __repr__(self):
> > return ("'%s'" % _UtConfReconcilerActions.__name__
> > + "\n id='%i'" % self.id
> > + "\n managed_id='%i'" % self.managed_id
> > + "\n action='%s'" % self.action
> > + "\n object_type='%s'" % self.object_type
> > )
>
> > class _UtConfReconcilerActionSnapshot(_UtConfReconcilerActions):
>
> > __tablename__ = 'tblReconcilerActionSnapshot'
> > # __mapper_args__ = {'with_polymorphic': '*'}
> > __mapper_args__ = {'polymorphic_identity': 'snapshot',
> > 'with_polymorphic': '*'}
>
> > # Joined table inheritence
> > id = Column(Integer, ForeignKey('tblReconcilerActions.id'),
> > primary_key=True)
>
> > revision = Column(String)
> > comment = Column(String)
>
> > def __repr__(self):
> > return (_UtConfReconcilerActions.__repr__(self)
> > + "\n '%s'" %
> > _UtConfReconcilerActionSnapshot.__name__
> > + "\n id='%s'" % self.revision
> > + "\n revision='%s'" % self.revision
> > )
>
> > __db_exists = os.path.exists(__DATABASE_NAME__)
>
> > engine = create_engine('sqlite:///' + __DATABASE_NAME__)
>
> > # New database, create the tables
> > if not __db_exists:
> > Base.metadata.create_all(engine)
> > print >> sys.stderr, ("WARINING - Creating empty '%s' database" %
> > __DATABASE_NAME__ )
>
> > Session = sessionmaker(bind=engine)
> > session = Session()
>
> > print session.query(_UtConfReconcilerActions).with_polymorphic
> > ('*').first()
>
> > <<<<<<<<<<<<<< end code >>>>>>>>>>>>>>>>>>
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