Extract only query spec

[caseyhelbling]

NOTE: DO NOT discuss internal CommitChange information in your PR; this PR will be public.
Link back to the issue in the Tix repo when you need to do that.

Per your CR request.

[wwahammy]

@caseyhelbling Nice work here, I'm debugging it some more. This reminds me of something I hadn't mentioned before but I should:

If you have an option on whether to use the entity factory normally associated with a model (:event, :nonprofit, :supporter, etc.) or one titled with the _base suffix (:event_base, :nonprofit_base, supporter_base, etc), you should always use _base version.

Here's why:

When I originally used Factory bot, I didn't understand it and I didn't follow best practices. In particular, I hardcoded things and I didn't follow the principle of "only fill the required attributes and nothing more". As I understood more, I wanted to follow those principles but it was going to be a headache to change the factories that already existed. To work around that, I just created these _base factories. In almost all cases, they're much better to work with for new specs.