helpers.php第747行中的ErrorException

Question

当我调用此控制器以保存用户在目录中的每个样式上选择的评级时，我一直收到此错误，这与我之前询问的如何将十进制保存到表行（Question的问题有关。 ）

helpers.php第747行中的ErrorException： 方法App \ Wasamar \ Rating :: __ toString（）必须返回字符串值

MY CONTROLLER

public function styleRating(){

    $allInputs = Input::all();
    $catalogueStyleId = Input::get('catalogueStyleId');
    $userId = Crypt::decrypt( Input::get('user') );
    $rating = Input::get('rating'); // value: 0.1 - 4.9


    $countUserStyleRating = count( Rating::where('catalogue_style_id',$catalogueStyleId)->where('user_id','=', $userId)->first() );

    if ( $countUserStyleRating == 0 ) {
        # add new rating data

        $rating = new Rating;
        $rating->user_id = $userId;
        $rating->catalogue_style_id = $catalogueStyleId;
        $rating->catalogue_style_rating = $rating;
        $rating->save();

        echo "Your rating has been noted thank you";
    }else{

        if ( $countUserStyleRating == 1 ) {
            # update rating data

            $UserStyleRating = Rating::where('catalogue_style_id',$catalogueStyleId)->where('user_id','=', $userId)->first();

            $rating = $UserStyleRating;
            $rating->user_id = $userId;
            $rating->catalogue_style_id = $catalogueStyleId;
            $rating->catalogue_style_rating = $rating;
            $rating->save();

            echo "Your rating has been noted thank you";
        }
    }
}