Tim Lesher wrote: > I'm using SQLAlchemy, reflecting from an existing MySQL database. I > want to override two DateTime columns to provide proper "created" and > "updated" timestamps (since MySQL can't handle auto-updating two > TIMESTAMP columns in the same row). > > According to the SA docs, this should work; however, when I autoload > my Table objects, I get the error: > > <class 'sqlalchemy.exceptions.ArgumentError'>: Table 'tablename' is > already defined for this MetaData instance. > > This short example illustrates the issue; the test_users table fails > to load. The error goes away if I either remove the foreign key > constraints in the 'test_pets' table, or remove the Column overrides > from the 'test_users' table. > > It seems as if SA is instantiating the users mapper first (because the > pets table refers to it), but not paying attention to the override; it > then tries to instantiate the users mapper to effect the override, but > fails.
You just need to swap the order of the two autoloads here. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
