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