> -----Original Message-----
> From: sqlalchemy@googlegroups.com [mailto:sqlalchemy@googlegroups.com]
> On Behalf Of Cody Django
> Sent: 20 June 2011 19:37
> To: sqlalchemy
> Subject: [sqlalchemy] dynamically set table_name at runtime
>
> Hello!
>
> I would like to dynamically set/change the table that is mapped in my
> python object, as instantiated through the declarative style.
>
>
> class Feature(Base, GeometryTableMixIn):
> """ this is dynamically created to use a table and pk_column
> determined at runtime """
>
> __table_args__ = {
> "schema": 'a_schema',
> "autoload": True,
> "autoload_with": Session.bind,
> "useexisting": True
> }
>
> wkb_geometry = GeometryColumn('wkb_geometry', Geometry(srid=4269))
>
> def __init__(self, *args, **kwargs):
> self.__tablename__ = kwargs['tablename']
> self.pk_id = Column('%s' % kwargs['pk_id'], types.Integer,
> primary_key=True, autoincrement=False)
> super(Feature, self).__init__(*args, **kwargs)
>
>
>
>
> This doesn't work:
>
> InvalidRequestError: Class <class 'javelin.model.feature.Feature'>
> does not have a __table__ or __tablename__ specified and does not
> inherit from an existing table-mapped class.
>
>
>
> Could this possibly be done through another approach? Suggestions
> are
> greatly appreciated.
>
Can you describe your use case? The solution presented in the
StackOverflow article seems like a hack at best. A cleaner way to do the
same thing might be:
def make_feature_class(tablename):
class Feature(Base, GeometryTableMixIn):
__table__ = tablename
# etc.
return Feature
...but the whole thing feels strange. What are you actually trying to
do?
Cheers,
Simon
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