Description:

Stubs out a new filter. Pass the filter name, either CamelCased or
under_scored, and an optional list of fields as arguments.

You don't have to think up every field up front, but it helps to
sketch out a few so you can start working with the filter immediately.

To create a filter within a module, specify the filter name as a
path like 'parent_module/filter_name'.

Example:

`rails generate filter users group persmission`

Users filter.
    Filter:     app/filters/users_filter.rb