如何将枢轴关系附加或附加到模型？

Question

每次我从lawyer_profiles_table 获取律师记录时，我都试图从practice_areas 表中获取律师的执业领域记录。这两个表（practice_areas 和lawyer_profiles）与一个名为（lawyer_practice_area）的数据透视表相关

以下代码来自 LawyerProfile 模型

public function practice_areas()
    {
        return $this->belongsToMany(PracticeArea::class, "lawyer_practice_area", "practice_area_id", "lawyer_id");
    }

我尝试通过执行以下操作来通过属性获取它

public function getPracticeAreasAttribute()
{
    return $this->practice_areas();
}

然后以这种方式附加它

protected $appends = ["practice_areas"];

但我一直在邮递员上得到这个结果 - "withtimestamps":"false"

见下面的输出：-

 "id": 1,
        "city": "Hintztown",
        "state": "Iowa",
        "longitude": "-163.884102",
        "latitude": "-18.127927",
        "lawyer_profile": {
            "id": 26,
            "email": "serena.barrows@yahoo.com",
            "name": "Raoul Hegmann",
            "primary_location_id": 1,
            "photo_id": 39,
            "phone_number": "887.299.6204 x456",
            "about_lawyer": "Distinctio eos omnis autem error.",
            "practice_areas": {
                "withTimestamps": false
            }
        }
    },

Answer 1

你想用的可能是Eager loading。

查看文档。

$books = App\Book::with('author')->get();

foreach ($books as $book) {
    echo $book->author->name;
}