These are the primary filtering, and autocomplete queries. The directory is being re-organized to:

Refactor all model specific files into their own directory
Inherit, where possible from Queries::Query
Dry scopes
Factor out shared Arel/query elements to named includes for Queryies::Query

Design guidelines

All references to ActiveRecord models must begin with ::, e.g. ::Otu.all
Params should be passed as a Hash, do the permitting of attributes in the controller.

Filter queries

should have an #all method that returns a Scope

Autocomplete queries

should have an #autocomplete method that returns an Array