I make occasional use of alternate collection classes for my sqlalchemy relationships. For example, column_mapped_collection. The existing collection classes in sqlalchemy.orm.collections work really well for me; I have a lot of relational data that very naturally belongs in dicts rather than lists because it makes sense as one thing indexed or mapped by another.
I find that I often need to add an item to one of these dict-mapped collections and would rather not have to check whether the key already exists in the dict. So I'm doing, essentially: collection.setdefault(key, []).append(value). As a matter of syntactic sugar (which alternative collection classes already are, anyway) I would like to have collection classes backed by dicts with the capability of python's defaultdict, so that I could write more simply, and with equivalent results: collection[key].append(value) I understand how to create my own collection class which will behave as desired. My question is, has anyone already got code for this that I could borrow rather than reinvent the wheel? Thanks in advance. -- Eric -- 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 sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
