[sqlalchemy] Re: odd question
On Jan 23, 2008 10:24 PM, Monty Taylor [EMAIL PROTECTED] wrote: This may or may not be elixir specific... If I have an auto-generated mapping table for a many-to-many relationship, is there a sensible way to add another column to it that's also has a foreign key relationship to a third table? Like, if I had this: Products id int name varchar ProductTypes id int name varchar Groups id int name varchar and then I defined a many to many between products and groups to get products_groups product_id group_id and I wanted to add producttype_id to that ... You'll probably want to use the Association Object pattern, as described at: http://www.sqlalchemy.org/docs/04/mappers.html#advdatamapping_relation_patterns_association And possibly, the AssociationProxy plugin, at: http://www.sqlalchemy.org/docs/04/plugins.html#plugins_associationproxy This one can be used with Elixir just fine. You just need to import it from SQLAlchemy: from sqlalchemy.ext.associationproxy import AssociationProxy -- Gaëtan de Menten http://openhex.org --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
[sqlalchemy] Re: odd question
On Jan 23, 2008, at 4:24 PM, Monty Taylor wrote: This may or may not be elixir specific... If I have an auto-generated mapping table for a many-to-many relationship, is there a sensible way to add another column to it that's also has a foreign key relationship to a third table? Like, if I had this: Products id int name varchar ProductTypes id int name varchar Groups id int name varchar and then I defined a many to many between products and groups to get products_groups product_id group_id and I wanted to add producttype_id to that ... If you're asking about creating mappers, a many-to-many table has exactly two foreign keys defined, that of a parent table and a child table. Any columns which are not part of those two foreign keys disqualifies the table to be considered a many-to-many table by SQLAlchemy's ORM; youd have to map a class to the table explicitly. if youre just talking about adding a column to a Table, i think theres an append_column() method which does that(check the docstrings) --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
