Implement server-side track removal from playlist

app/Commands/RemoveTrackFromPlaylistCommand.php

@@ -0,0 +1,63 @@
+<?php
+
+/**
+ * Pony.fm - A community for pony fan music.
+ * Copyright (C) 2015 Peter Deltchev
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace Poniverse\Ponyfm\Commands;
+
+use Poniverse\Ponyfm\Playlist;
+use Poniverse\Ponyfm\Track;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\DB;
+
+class RemoveTrackFromPlaylistCommand extends CommandBase
+{
+    private $_track;
+    private $_playlist;
+
+    function __construct($playlistId, $trackId)
+    {
+        $this->_playlist = Playlist::find($playlistId);
+        $this->_track = Track::find($trackId);
+    }
+
+    /**
+     * @return bool
+     */
+    public function authorize()
+    {
+        $user = Auth::user();
+
+        return $user != null && $this->_playlist && $this->_track && $this->_playlist->user_id == $user->id;
+    }
+
+    /**
+     * @throws \Exception
+     * @return CommandResponse
+     */
+    public function execute()
+    {
+//        $songIndex = $this->_playlist->tracks()->count() - 1;
+        $this->_playlist->tracks()->detach($this->_track);
+        Playlist::whereId($this->_playlist->id)->update([
+            'track_count' => DB::raw('(SELECT COUNT(id) FROM playlist_track WHERE playlist_id = ' . $this->_playlist->id . ')')
+        ]);
+
+        return CommandResponse::succeed(['message' => 'Track removed!']);
+    }
+}

app/Http/Controllers/Api/Web/PlaylistsController.php

@@ -25,6 +25,7 @@ use Poniverse\Ponyfm\Commands\AddTrackToPlaylistCommand;
 use Poniverse\Ponyfm\Commands\CreatePlaylistCommand;
 use Poniverse\Ponyfm\Commands\DeletePlaylistCommand;
 use Poniverse\Ponyfm\Commands\EditPlaylistCommand;
+use Poniverse\Ponyfm\Commands\RemoveTrackFromPlaylistCommand;
 use Poniverse\Ponyfm\Http\Controllers\ApiControllerBase;
 use Poniverse\Ponyfm\Image;
 use Poniverse\Ponyfm\Playlist;
@@ -56,6 +57,11 @@ class PlaylistsController extends ApiControllerBase
         return $this->execute(new AddTrackToPlaylistCommand($id, Input::get('track_id')));
     }
 
+    public function postRemoveTrack($id)
+    {
+        return $this->execute(new RemoveTrackFromPlaylistCommand($id, Input::get('track_id')));
+    }
+
     public function getIndex()
     {
         $page = 1;

app/Http/routes.php

@@ -119,6 +119,7 @@ Route::group(['prefix' => 'api/web'], function() {
         Route::post('/playlists/delete/{id}', 'Api\Web\PlaylistsController@postDelete');
         Route::post('/playlists/edit/{id}', 'Api\Web\PlaylistsController@postEdit');
         Route::post('/playlists/{id}/add-track', 'Api\Web\PlaylistsController@postAddTrack');
+        Route::post('/playlists/{id}/remove-track', 'Api\Web\PlaylistsController@postRemoveTrack');
 
         Route::post('/comments/{type}/{id}', 'Api\Web\CommentsController@postCreate')->where('id', '\d+');
 

resources/assets/scripts/app/services/playlists.coffee

@@ -68,6 +68,13 @@ angular.module('ponyfm').factory('playlists', [
 
                 def
 
+            removeTrackFromPlaylist: (playlistId, trackId) ->
+                def = new $.Deferred()
+                $http.post('/api/web/playlists/' + playlistId + '/remove-track', {track_id: trackId}).success (res) ->
+                    def.resolve(res)
+
+                def
+
             refresh: () ->
                 if auth.data.isLogged
                     $.getJSON('/api/web/playlists/pinned')