Avoid fetching table data in duplicate from ListView mixin

[mmirate]

Fixes #914. Thank you for your consideration.

[limugob]

The normal implementation of ListView fills beside the variable object_list⁣ the model_name_list variable with the same data. But this PR omits the model_name_list variable.

[mmirate]

The normal implementation of ListView fills beside the variable object_list⁣ the model_name_list variable with the same data. But this PR omits the model_name_list variable.

I'm trying to understand this, but grep is being uncooperative. Are you perchance referring to django.views.generic.list.MultipleObjectTemplateResponseMixin.get_template_names? Else, can you point me concretely to what you're referring to in Django?

[limugob]

I mean, if I have a ListView for the model Dog then in
https://github.com/django/django/blob/192bc7a7be92e20cc250907fb4083df689715679/django/views/generic/list.py#L145
the template variable dogs_list is filled (together with objects_list). But with this PR only the objects_list variable is filled properly.

[jieter]

What is the reason for the alias? Can't we just do from django.views.generic.list import ListView, MultipleObjectMixin?

[sjoerdjob]

If there are multiple overrides of get_context_data, this could skip more than just the MultipleObjectMixin.get_context_data that this PR tries to skip.

I feel as if the current implementation could have unintended breaking side-effects.