app\models\Project::tableName PHP Method

    public static function tableName()
    {
        return 'project';
    }

 public function down()
 {
     $this->dropColumn(Project::tableName(), 'post_release');
     $this->renameColumn(Project::tableName(), 'pre_release', 'post_release');
     echo "m151014_115546_add_pre_release_task be reverted.\n";
     return true;
 }