On Jun 21, 2008, at 11:38 AM, Werner F. Bruhin wrote:
> Looking at > "http://www.sqlalchemy.org/docs/05/ormtutorial.html#datamapping_declarative > " > it would be really nice if the "init" and "repr" methods are > automagically generated, or maybe something like a mixin could be > provided. declarative already does generate a keyword-based "__init__" method if none is present. variations on this theme, including __repr__, are trivial for end users to create as base classes (note that declarative supports a user-defined base class, use the 'cls' argument to declarative_base()). > The debug problem (see traceback below) I had is due to the code I > used > from the wiki: > http://www.sqlalchemy.org/trac/wiki/UsageRecipes/GenericOrmBaseClass > > The code does not work in 0.5 anymore, one reason is that the > MyClass.c > attribute is no longer there. The usage of "self.c" there is broken in any version; it does not account for attributes on the instance which are renamed based on the column, and also does not account for any relation-based attributes. That's the entire point of there being a "mapper()" that is distinct from a "Table". My preference on a custom __init__ is just : def __init__(self, **kwargs): for k in kwargs: setattr(self, k, kwargs[k]) Since I think the assumption that "every kwarg must match a mapped attribute" is naive; theres plenty of non-mapped attributes an object might have. But if you really want to match them against the mapping, do it against what the mapping says, not the table: def __init__(self, **kwargs): mapper = object_mapper(self) for k in kwargs: if not mapper.get_property(k, raiseerr=False): raise Exception("no such attribute %s" % k) setattr(self, k, kwargs[k]) --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
