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如何将数据存储在users.sport_id

用户等级:

public function sport() {
    return $this->belongsToMany('App\Sport');
}

运动桌有:

+----+------------+
| id |    sport   |
+----+------------+
| 1  |  baseball  |
+----+------------+
| 2  | basketball |
+----+------------+

我是否将其添加user.sport_id = 1,2或保存为数组[1,2]并使用$casts = ['sport_id'=>'array'];

4

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