On Jul 29, 2010, at 11:08 PM, Russell Warren wrote:
> I've got a bunch of old sqlalchemy code using the declarative
> framework where the default field values could be assigned after the
> initial definition, as in this reduced example:
>
> #######
>
> from sqlalchemy import *
> from sqlalchemy.ext.declarative import declarative_base
> from sqlalchemy.orm import relation, sessionmaker
>
> Base = declarative_base()
>
> class Bogus(Base):
> __tablename__ = 'bogus'
>
> pk = Column(Integer, primary_key=True)
> c1 = Column(Integer)
> c1.default = 2000 ## NOW A PROBLEM ##
>
> engine = create_engine("sqlite://", echo = True)
> Base.metadata.create_all(engine)
>
> #######
>
> Now this code crashes on the create_all() call inside visitors.py's
> traverse_using() call, with:
>
> AttributeError: 'int' object has no attribute '__visit_name__'
use default=ColumnDefault(2000).
>
> If I move the default assignments into the column constructor with the
> "default=" kwarg (as is proper according to current docs), it works
> fine.
>
> Is there a clean/functional/safe way to assign defaults _after_ the
> first assignment? The old code collected together all the default
> assignments in one spot to cut down on the size of the (large) table
> definition code and improve readability of the code... it would be
> great to keep it that way.
>
> I'm using sqla 0.6.3 now.
>
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