On May 21, 2010, at 5:08 AM, James Neethling wrote: > Hi All, > > > When we append to the image.tags collection, the entity_tag table needs > to know that the entity_type is 'image', but we can't seem to set that. > > What is the standard way of dealing with this problem? > > Is there the concept of a generic foreign key in SQLAlchemy? > > Does anyone know if this database pattern has a formal name?
it is often called "polymorhpic association" and there is a full series of examples in examples/poly_assoc, as well as a link to a blog post regarding the subject in the __init__.py file. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to [email protected]. 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.
