[sqlalchemy] Dynamic query

[Julien Cigar]

Hello,

any idea why with
# Query

class BaseQuery(orm.Query):
        @dynamic
        def method_a(self):
                ...
        def method_b(self):
                ...

class FooQuery(BaseQuery):
        ...

class BarQuery(FooQuery):
        @dynamic
        def method_c(self):
                ...

# Models

class BaseModel(object):
        query = Session.query_property(BaseQuery)

#

myQuery = type('PolymorphicQuery, (content.BaseQuery, ), 
func_list)(BaseModel)

where "func_list" containing all the functions decorated by @dynamic the 
following fail? :

- myQuery.get(45) fails with: AttributeError: 'NoneType' object has no 
attribute 'identity_map'
- myQuery.method_a().all() fails with: AttributeError: 'NoneType' object 
has no attribute '_autoflush'
- etc

My goal is to be able to build a custom Query object to use with the 
.with_polymorphic() function ..

Thanks,
Julien

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