<%= form_with scope: :track, local: true do |t| %>
  <p>
    <%= t.text_field :name %>
  </p>

  <p>
    <%= t.text_area :description %>
  </p>

  <p>
    <%= t.text_field :genre %>
  </p>

  <p>
    <%= t.file_field :audiofile %>
  </p>

  <p>
    <%= t.submit %>
  </p>
<% end %>

class TracksController < ApplicationController
  before_action :set_track, only: [:show, :update, :destroy]

  def index
    @tracks = Track.all
    json_response(@tracks)
  end

  def new
    @track = Track.new
  end

  def find_by_genre
    @tracks = Track.where(genre: [params[:genre]])
    json_response(@tracks)
  end

  def create
    @track = Track.create!(track_params)
    json_response(@track, :created)
  end

  def show
    json_response(@track)
  end

  def update
    @track.update(track_params)
    head :no_content
  end

  def destroy
    @track.destroy
    head :no_content
  end

  private
    def track_params
      params.permit(:name, :description, :genre, :audiofile, :created_by)
    end

    def set_track
      @track = Track.find(params[:id])
    end
end

<%= form_with scope: :track, local: true do |t| %>

<%= form_with url: tracks_path do |form| %>