this is why I hate adding new features, b.c. now i have to support them, though
concrete with declarative really needed a push. The abstract concrete bases
have probably not yet been tested with multiple-level inheritance. Hard to say
where things are going wrong without running a test and pdb'ing...if you want
to help out you can attach a full reproducible test case as a ticket to
http://www.sqlalchemy.org/trac/newticket , log in as "guest"/"guest".
On Oct 28, 2011, at 12:27 PM, JPLaverdure wrote:
> Hello,
>
> I started playing with Concrete Table Inheritance this morning and tried to
> implement a portion of my schema:
>
> class Mixin(object):
> __table_args__ = {'schema':'test'}
>
> id = Column(Integer, primary_key=True)
>
>
> class Node(ConcreteBase, Base, Mixin):
> __tablename__ = 'node'
> __mapper_args__ = {'polymorphic_identity':'node', 'concrete':True}
>
>
> class Sample(Node, Mixin):
> __tablename__ = 'sample'
> __mapper_args__ = {'polymorphic_identity':'sample', 'concrete':True}
>
>
> class DNA(Sample, Mixin):
> __tablename__ = 'dna'
> __mapper_args__ = {'polymorphic_identity':'dna', 'concrete':True}
>
> token = Column(String(128), nullable=False)
> qty = Column(Integer, nullable=False)
> comments = Column(String(256))
>
> def __init__(self, token, qty, comments=None):
> self.token = token
> self.qty = qty
> self.comments = comments
>
> def __repr__(self):
> return """<Sample(%s, %s, Qty: %s)>""" % (self.id, self.token,
> self.qty)
>
>
> class RNA(Sample, Mixin):
> __tablename__ = 'rna'
> __mapper_args__ = {'polymorphic_identity':'rna', 'concrete':True}
>
> token = Column(String(128), nullable=False)
> qty = Column(Integer, nullable=False)
> comments = Column(String(256))
>
> def __init__(self, token, qty, comments=None):
> self.token = token
> self.qty = qty
> self.comments = comments
>
> def __repr__(self):
> return """<RNA(%s, %s, Qty: %s)>""" % (self.id, self.token, self.qty)
>
> But after inserting some DNA and RNA entities...
> It seems that:
>
> session.query(Node).all()
>
> returns an empty list whereas:
>
> session.query(Sample).all()
>
> returns a polymorphic list of RNAs and DNAs...
> Am I missing something ?
>
>
> Also:
> If I declare Node as per:
>
> class Node(AbstractConcreteBase, Base):
> pass
>
> Instead of above, I get the following error:
> assert mapper is mapper.base_mapper
> AssertionError
>
> In a perfect world, I would have both Node and Sample as abstract classes but
> I can't seem to get that going..
>
> Any pointers ?
> Thanks !
>
>
>
>
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