app/controllers/tracks_controller.rb
class TracksController < ApplicationController
def index
@track_finder = TrackFinder.new(track_finder_params)
@names = [nil] + Track.order(:name).distinct.pluck(:name)
@artists = [nil] + Track.order(:artist).distinct.pluck(:artist)
end
private
def track_finder_params
params.permit(:name, :artist)
end
end