On Jun 7, 2013, at 9:31 AM, Richard Gerd Kuesters <rich...@humantech.com.br>
wrote:
> Hi all!
>
> I'm refactoring a database schema but I need it to mantain reverse
> compatibility with older versions of our software - using views.
>
> But, to avoid confusion to other developers, new tables have two underscores
> as a prefix, like:
>
>
> class Base(object):
>
> @declared_attr
> def __tablename__(cls):
> return "__%s" % to_python_case(cls.__name__)
>
>
> Now I want to add column prefixes too. I know I can append to this Base
> object:
>
> __mapper_args__ = dict(
> column_prefix='_'
> )
>
> But, when I inherit this new base on classes that I need to use
> __mapper_args__, column names probably won't have prefixes. Any ideas,
> perhaps an event listener to prepend the underscore into *all* column names?
one idea is you can intercept how mapper() is called by declarative by
overriding __mapper_cls__, like:
@classmethod
def __mapper_cls__(cls, *args, **kw):
kw['column_prefix'] = '_'
return mapper(*args, **kw)
>
>
> Cheers,
> Richard.
>
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