Laravel 在 all() 之后通过 pivot on load() 从关系中获取列的值

Question

我在从 Laravel 中的关系中检索列的值时遇到问题。
我有一个用户模型。该模型与 table 顺便说一句有关。名为 Userhobbies 的模型。
现在我们有：
User ::: hasMany >>> Userhobbies
现在
User::all()->load('hobbies')
我得到了正确的结果，比如

{"id":"1","username":"jdoe","first_name":"Joe","last_name":"Doe","birth":"
1992-04-11","picture_id":"f3dca65323e876026b409b9ba3d49c56","hobbies":
[{"hobby_id":"1","user_id":"1"},{"hobby_id":"2","user_id":"1"},
{"hobby_id":"3","user_id":"1"},{"hobby_id":"4","user_id":"1"}]}

如您所见，Userhobbies 仅包含爱好 - table（爱好模型）和用户 - table（用户模型）之间的主键关系。
（爱好模型与用户爱好也有 hasMany 关系）

我现在的问题是 - 如何在我的调用中（在 load('hobbies') 之后）检索所有爱好名称（来自爱好 - table）并且是否可以不编写大量代码？

为了更好地理解我的想法，我想要检索的结果：

{"id":"1","username":"jdoe","first_name":"Joe","last_name":"Doe","birth":"
1992-04-11","picture_id":"f3dca65323e876026b409b9ba3d49c56","hobbies":
["golf", "cards", "games", "football"]}

编辑：
如果我尝试以下（我尝试在用户和爱好中使用 belongsToMany）：

User::with('hobbies')->get()->first()

我从爱好中获得了全部价值 - table:

{user-specific data ...
hobbies:[{"id":"1","name":"golf","created_at":"2015-04-07 
14:15:02","updated_at":"2015-04-07 14:15:02","pivot":
{"user_id":"1","hobby_id":"1"}},
{"id":"2","name":"cards","created_at":"2015-04-07 
14:15:02","updated_at":"2015-04-07 14:15:02","pivot":    
{"user_id":"1","hobby_id":"2"}},
{"id":"3","name":"games","created_at":"2015-04-07 
14:15:02","updated_at":"2015-04-07 14:15:02","pivot":
{"user_id":"1","hobby_id":"3"}},
{"id":"4","name":"football","created_at":"2015-04-07 
14:15:02","updated_at":"2015-04-07 14:15:02","pivot":
{"user_id":"1","hobby_id":"4"}}]}

同样尝试 ->load('hobbies')。我真的不知道如何继续下去。

为了更详细地解释一下我需要什么，可以想象这样的查询：

User::all(['id', 'name'])->load(array('hobbies.id','hobbies.name'))->get();

Answer 1

据我所知，我知道可以使用闭包对执行加载的查询设置约束，如下所示：

User::all()->load(['hobbies' => function($query)
{
    $query->select('id', 'name');
}]);

通过这样做，当你将它转换为数组时，它会产生一个接近你想要的结果。您甚至可以将 'pivot' 添加到您 Hobby 模型上的 $hidden 属性以隐藏此信息。

Laravel 在 all() 之后通过 pivot on load() 从关系中获取列的值

Laravel get value of column from relation through pivot on load() after all()

database

laravel

foreign-keys

eloquent

relationship