public function show($id)
 {
     $song = Song::findOrFail($id);
     $is_love = false;
     if (Auth::user()) {
         $love = ['song_collection_id' => $song->song_id, 'love_source' => 0, 'love_user' => Auth::user()->id];
         $row = Love::where($love)->first();
         if ($row) {
             $is_love = true;
         }
     }
     return view('song/show', compact('song', 'is_love'));
 }
 /**
  * Show the application dashboard.
  *
  * @return \Illuminate\Http\Response
  */
 public function index()
 {
     $music = Music::orderBy('music_id', 'desc')->first();
     $love = ['song_collection_id' => $music->music_id, 'love_source' => 1];
     $loves = Love::where($love)->count();
     $is_love = false;
     if (Auth::user()) {
         $love['love_user'] = Auth::user()->id;
         $row = Love::where($love)->first();
         if ($row) {
             $is_love = true;
         }
     }
     $previous = Music::where('music_id', '<', $music->music_id)->max('music_id');
     $next = Music::where('music_id', '>', $music->music_id)->min('music_id');
     return view('music/show', compact('music', 'loves', 'is_love', 'previous', 'next'));
 }
 public function love($source, $collection_id)
 {
     if (Auth::user()) {
         $love = ['song_collection_id' => $collection_id, 'love_source' => $source, 'love_user' => Auth::user()->id];
         $row = Love::where($love)->first();
         if ($row) {
             $row->delete();
             return 1;
         } else {
             Love::create($love);
             return 2;
         }
     }
     return 0;
 }