id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 26141 __lt__ for model instances Sven R. Kunze nobody "We need to sort a list of model instances (not a queryset). After some research, we didn't find a standard way to do this with Django model instances. Would it be possible to implement {{{__lt__}}} for model instances via the meta class mechanism? Currently, we write a wrapper where we implemented the following {{{__lt__}}} method: {{{ def __lt__(self, other): for criteria in self.object._meta.ordering: field = criteria[1:] if criteria.startswith('-') else criteria mine = getattr(self.object, field) theirs = getattr(other.object, field) if isinstance(mine, unicode): mine = locale.strxfrm(mine.encode('utf8')) theirs = locale.strxfrm(theirs.encode('utf8')) if mine == theirs: continue if criteria.startswith('-'): return mine > theirs return mine < theirs raise NotImplementedError }}} Please note, that the implementation is locale-aware." New feature closed Database layer (models, ORM) dev Normal wontfix tzanke@… Unreviewed 0 0 0 0 0 0