Mix FormView with ListView functionality

[Evandro Myller]

I've been wrestling this for hours and still couldn't figure out how one can mix a FormView with a ListView without having to repeat code or writing nasty code pieces.

A very simple use case: Object search view.

Many times we need to combine a simple search form into a ListView, but there's no straightforward way to do so. What I expected is that inheriting from ListView and FormView at once could get me to what I need, but, instead, it clashes on form/object_list context variables because of the order of their get methods.

In my - and many - cases, I need to process the search form - actually a model form, since it comes from a model called SavedSearch - in order to filter items out, save the search object and whatever else, depending on the form.

I expected that #16074 would fix this. :-(

[Aymeric Augustin]

The generic class based views aren't intended to be arbitrarily combinable blocks. Rather, they're ready-to-use examples for trivial cases. This is ​explained in the documentation.