Dylan Moreland wrote: > I'm trying to implement a bunch of class methods in an ORM object in > order to provide functionality similar to Rails' ActiveRecord. This > means that if I have an SQL table mapped to the class "Person" with > columns name, city, and email, I can have class methods such as: > > Person.find_by_name > Person.find_by_city_and_name > Person.find_by_name_and_city_and_email > > I have a metaclass generating basic properties such as .name and .city, > but I don't want to generate a class method for every permutation of > the attributes. I'd like to have something much like __getattr__ for > instance attributes, so that if a method like > Person.find_by_city_and_email cannot be found, I can construct a call > to the basic find method that hides the SQL. Is there any way of doing > this, ...
Sure, define __getattr__ on the type of the class i.e., the metaclass, just as you define it on a class to provide default-attribute-lookup to its instances: >>> class A(object): ... class __metaclass__(type): ... def __getattr__(cls, attr): ... return "%s.%s" % (cls.__name__, attr) ... >>> A.somefunc 'A.somefunc' >>> A.someotherfunc 'A.someotherfunc' >>> HTH Michael -- http://mail.python.org/mailman/listinfo/python-list
