Organize your controller and place each action/functionality in a separate file. Especially if your controller actions are too big you can use controller_concerned. I know, the better way is to refactor your controller code to avoid masses of lines, but if you haven’t enough time for refactoring, try this.

class UsersController < ApplicationController
  concerned_with :searching
end

concerned_with will require files at controller/users/ Just add a file to controller/users/ and thats it.

name: searching.rb

class UsersController
  def search
  end
end