there's no "registry" of tables to mappers. You'd need to track that
yourself, or otherwise scan through all mappers (non-public attribute
sqlalchemy.orm._mapper_registry) looking for tables (each mapper has a
.local_table attribute). Note that many mappers can be created against a
single table.
To track yourself:
from sqlalchemy.orm import mapper as _mapper
import collections
my_registry_of_tables = collections.defaultdict(set)
def mapper(cls, table=None, *arg, **kw):
my_registry_of_tables[table].add(cls)
return _mapper(cls, table, *arg, **kw)
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base(mapper=mapper)
On Mar 7, 2011, at 11:51 PM, James Mills wrote:
> Hello,
>
> Given a scenario where you're using declarative_base(...) and defining classes
>
> Is there a way to ask SA what the mapper class (declarative) is for a given
> table
> by inspecting something in metadata["table_name"] ?
>
> cheers
> James
>
>
>
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