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 9573,template filter length() should call .count() on querysets,wam,nobody,"Currently, `django.template.defaultfilters.length()` just calls `len()` on the passed in value. If the passed in value is queryset, `len(queryset)` of course ends up calling `django.db.query.QuerySet().__len__()`. This method ends ends up mapping the queryset into a list and calling `len()` on the resulting list (it will also of course use cached versions of the queryset list, but in all cases, the queryset gets expanded into an in-memory list). I'd like to suggest that `django.template.defaultfilters.length()` instead do something like: {{{ def length(value): """"""Returns the length of the value - useful for lists."""""" try: value.count() except: return len(value) }}} ",,closed,"Database layer (models, ORM)",1.1,,wontfix,,,Unreviewed,0,0,0,0,0,0