Question

我正在使用Laravel 5.5，我有一个电影模型：

  
    class Movie extends Model
    {
        public function comments(){
            return $this->hasMany(Comment::class);
        }
    }

和评论模型：

class Comment extends Model
{
    public function movie(){
        return $this->belongsTo(Movie::class);
    }
}

我有一个电影实例（存储在$ movie变量中）：

id: "tt5726616",
     title: "Call Me by Your Name",
     original_title: "Call Me by Your Name",
     rate: 4,
     year: 2017,
     length: "132",
     language: "English, Italian, French, German",
     country: "Italy, France, Brazil, USA",
     director: "Luca Guadagnino",
     created_at: "2018-01-21 15:28:31",
     updated_at: "2018-01-21 15:28:31",

我有4条评论，其中2条与相应的电影相关：

all: [
       App\Comment {#788
         id: 1,
         movie_id: "tt3967856",
         author: "user1",
         comment: "cool!",
         rate: 2,
         created_at: "2018-01-21 15:28:32",
         updated_at: "2018-01-21 15:28:32",
       },
       App\Comment {#786
         id: 2,
         movie_id: "tt3967856",
         author: "user2",
         comment: "not bad!",
         rate: 3,
         created_at: "2018-01-21 15:28:32",
         updated_at: "2018-01-21 15:28:32",
       },
       App\Comment {#785
         id: 3,
         movie_id: "tt5726616",
         author: "user1",
         comment: "cool!",
         rate: 4,
         created_at: "2018-01-21 15:28:32",
         updated_at: "2018-01-21 15:28:32",
       },
       App\Comment {#784
         id: 4,
         movie_id: "tt5726616",
         author: "user2",
         comment: "not bad!",
         rate: 5,
         created_at: "2018-01-21 15:28:32",
         updated_at: "2018-01-21 15:28:32",
       },
     ],

问题是，当我调用$ movie-＆gt;评论时，它会返回我的所有4条评论，而不仅仅是那些带有movie_id tt3967856的评论。我该怎么办？

解决： 我认为这是因为我使用字符串类型作为我的主键和外键。我将ids更改为整数（我的意思是1,2，...而不是“tt3967856”等），一切正常：D

Answer 1

如果指定外键和本地键

，该怎么办？

class Movie extends Model
{
   protected $casts=['movie_id'=>'integer'];

    public function comments(){
        return $this->hasMany(Comment::class,movie_id,id);
    }
}

<强>更新：我还注意到movie_id在评论对象

中有字符串类型

你应该把它强制转换为整数

Laravel HasMany Relation返回所有模型，而非相关模型

1 个答案: