英文:
Laravel appended attribute returns null when model is initiated through dependecy injection
问题
当我通过Laravel的路由依赖注入实例化模型对象时，我有一个附加的属性，它在执行Model::first()->appended_attribute时有效，但是当我像下面这样获取模型对象时：
public function update(UserRequest $request, User $user)
{
$user->appended_attribute; // 返回 null
}
当我访问它时，它返回null，尽管当我执行$user->toArray()时，附加属性确实存在，但值为null。
如果我这样做：
public function update(UserRequest $request, User $user)
{
User::find($user->id)->appended_attribute; // 返回正确的值
}
它可以正常工作。
附加属性的方法：
public function getCurrentRoleAttribute()
{
return $this->roles->first();
}
我是否遗漏了什么？
英文:
I have an appended attribute that works when I do Model::first()->appended_attribute, but when get the model object instantiated through laravel's route dependency injection like below :
public function update(UserRequest $request, User $user)
{
$user->appended_attribute; // returns null
}
When I access it it returns null, Though when I do $user->toArray() the appended attributes does exist but with a value of null.
And if I do this :
public function update(UserRequest $request, User $user)
{
User::find($user->id)->appended_attribute; // returns it's correct value
}
It does work.
The append attribute method :
public function getCurrentRoleAttribute()
{
return $this->roles->first();
}
Is there anything I'm missing ?
答案1
得分: 0
这取决于一个可能尚未加载的关系？尝试将这段代码添加到你的访问器中。
public function getCurrentRoleAttribute()
{
$this->loadMissing('roles');
return $this->roles->first();
}
英文:
It depends on a relationship that might not be loaded? Try adding this to your accessor.
public function getCurrentRoleAttribute()
{
$this->loadMissing('roles');
return $this->roles->first();
}
答案2
得分: 0
Short answer:
这是对Spatie的权限包的错误使用。
Long answer:
感谢@IGP的答案，给了我一个有关缺失关系加载的提示，我发现不是关系缺失，而恰恰相反！！。
删除用户模型中的这行后，它正常工作：
protected $with = ['roles'];
这是因为我正在使用Spatie的权限包，它使用用户登录后提供的team_id来加载用户的roles关系（在该团队中）。现在，我将关系设置为使用$with属性预加载，实际上是在设置team_id之前加载关系！！，这就是为什么它返回null的原因。
对于没有提供更多关于问题的信息，我感到抱歉 (:'.
英文:
Short answer:
It's a miss use of spatie's permissions package.
Long answer:
Thanks to @IGP 's answer for giving me a hint about the missing relation load, I found out that it's not that it's missing, it's actually the opposite !!.
After removing this line from the user model it worked :
protected $with = ['roles'];
It was because I'm using spatie's permissions package which uses the team_id provided after the user's login to load the user's roles relation (in that team). Now me setting the relation to be eagerly loaded with the $with property is basically saying load the relation before setting the team_id !!, That's why it was returning null.
SORRY FOR NOT PROVIDING MORE INFO ABOUT THE ISSUE (:'
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