[Sqlalchemy-tickets] [sqlalchemy] #2918: polymorphic aliasing failure when using trivial column subclass

[sqlalchemy <mi...@zz...>]

#2918: polymorphic aliasing failure when using trivial column subclass
---------------------+------------------------------------
 Reporter:  zzzeek   |           Owner:  zzzeek
     Type:  defect   |          Status:  new
 Priority:  highest  |       Milestone:  0.9.xx
Component:  orm      |        Severity:  major - 1-3 hours
 Keywords:           |  Progress State:  in progress
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 this seems like an 0.9 regression

 {{{
 #!python
 from sqlalchemy import *
 from sqlalchemy.orm import *
 from sqlalchemy.ext.declarative import declarative_base

 Base = declarative_base()

 class A(Base):
     __tablename__ = 'a'

     id = Column(Integer, primary_key=True)

 class MySpecialColumn(Column):
     pass


 class B(A):
     __tablename__ = 'b'

     id = Column(ForeignKey('a.id'), primary_key=True)
     x = MySpecialColumn(String)

 s = Session()

 print s.query(A).join(B).filter(B.x == 'asdf')
 }}}

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Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2918>
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