HairTrigger uses the ActiveRecord::Base.descendants to find triggers
in the db (from `models`). WithModel (used in the Settings::Base spec)
clears this during its descendants cleanup, causing this test to
ocassionally fail.
Before checking hairtrigger, if AR::Base descendents is empty, add
ApplicationRecord (there's an assumption here that all of our
application models inherit from application record - this may or may
not be true if we use engine generated models that do not follow this
convention and need to validate triggers there.
* Add HairTrigger spec
* Add weights to columns tsvectors
* Add correct sorting for search results
* Remove Timecop.travel
* Changed order of columns in trigger based on weights
