I have to check but I think I get the same error if I name the keys
differently in each table. Eric
2008/10/21, [EMAIL PROTECTED] <[EMAIL PROTECTED]>:
>
> concrete polymorphism with good deal of inheritance and same-keys does
> not work in current SA.
> there's no way to differ between X.id=1 and Y.id=1 in the polymunion.
> there were ideas to add some type-discriminator in the union's primary
> key, and use that in the machinery, but AFAIK no much is done.
> my set of concrete-inh testcases still fails in same ways as before (i
> think there is one more failing since 0.5)
> Mike will know better.
>
> On Tuesday 21 October 2008 10:48:02 Eric Lemoine wrote:
>> On Mon, Oct 20, 2008 at 7:46 PM, Michael Bayer
> <[EMAIL PROTECTED]> wrote:
>> > its not a known issue but sounds like a bug. a very concise
>> > test case which we can use as a unit test would help here.
>>
>> I hope this is good enough:
>>
>>
>>
>> from sqlalchemy import *
>> from sqlalchemy.orm import *
>>
>> engine = create_engine('sqlite://', echo=True)
>> metadata =MetaData(engine)
>> Session = scoped_session(sessionmaker(bind=engine))
>>
>> refugees_table = Table('refugee', metadata,
>> Column('refugee_fid', Integer, primary_key=True),
>> Column('refugee_name', Unicode, key='name'))
>>
>> offices_table = Table('office', metadata,
>> Column('office_fid', Integer, primary_key=True),
>> Column('office_name', Unicode, key='name'))
>>
>> pjoin = polymorphic_union({
>> 'refugee': refugees_table,
>> 'office': offices_table
>> }, 'type', 'pjoin')
>>
>> metadata.create_all()
>>
>> class Location(object):
>> pass
>>
>> class Refugee(Location):
>> pass
>>
>> class Office(Location):
>> pass
>>
>> location_mapper = mapper(Location, pjoin,
>> polymorphic_on=pjoin.c.type, polymorphic_identity='location')
>> refugee_mapper = mapper(Refugee, refugees_table,
>> inherits=location_mapper, concrete=True,
>> polymorphic_identity='refugee') office_mapper = mapper(Office,
>> offices_table, inherits=location_mapper, concrete=True,
>> polymorphic_identity='office')
>>
>> engine.execute("insert into refugee values(1, \"refugee1\")")
>> engine.execute("insert into refugee values(2, \"refugee2\")")
>> engine.execute("insert into office values(1, \"office1\")")
>> engine.execute("insert into office values(2, \"office2\")")
>>
>> # these two pass, good!
>> assert Session.query(Refugee).get(1).name == "refugee1"
>> assert Session.query(Refugee).get(2).name == "refugee2"
>>
>> #assert Session.query(Office).get(1).office_name == "office1"
>> #assert Session.query(Office).get(2).office_name == "office2"
>>
>> # these two fail, bad!
>> assert Session.query(Office).get(1).name == "office1"
>> assert Session.query(Office).get(2).name == "office2"
>>
>> --
>> Eric
>>
>>
>
>
> >
>
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