Php 访问延迟加载的属性

下面的查询返回一个对象，然后将该对象发送到视图

$user = $this->user->find($id)
            ->load(
                'images',
                'albums',
                'measurements',
                'medicalAnswers.medicalQuestion',
                'goals.strengthGoalDesc.excersise',
                'goals.distanceGoalDesc.excersise',
                'goals.bodyGoalDesc',
                'client.trainers.user',
                'trainer.clients.user',
                'trainer.classes',
                'trainer.types',
                'trainer.programs.weeks.days.sessions.phases.excersises',
                'trainer.testimonials'
            );

在视图中，我正在做很多事情来显示所有这些信息，在我尝试访问与这些关系相关的属性之前，一切都很顺利

            'goals.strengthGoalDesc.excersise',
            'goals.distanceGoalDesc.excersise',

下面是一个示例，它说明了一个目标返回的内容，该目标具有一个练习的strength goal desc

{
"id":"2",
"userId":"1",
"title":"strength goal title",
"goalDesc":"This should describe my strngth goal in text form",
"goalStatus":"0",
"bodyGoalId":null,
"strengthGoalId":"1",
"distanceGoalId":null,
"created_at":"2014-01-16 15:51:16",
"updated_at":"2014-01-16 15:51:16",
"strength_goal_desc":{
    "id":"1",
    "excersise":{
        "id":"1",
        "name":"Leg Extension",
        "type":"Resistance",
        "variation":null, 
        "equipment":"Machine", 
        "focus":"Legs", 
        "desc":"", 
        "video":null, 
        "created_at":"2014-01-16 15:51:18", 
        "updated_at":"2014-01-16 15:51:18"},
    "sets":"4", 
    "reps":"10",
    "weight":"70.00", 
    "created_at":"2014-01-16 15:51:16", 
    "updated_at":"2014-01-16 15:51:16"}, 
"distance_goal_desc":null,
"body_goal_desc":null} 

我的第一个问题是，为什么bodyGoalDesc、distanceGoalDesc和strengthGoalDesc被转换为snake case？在我所做的工作中（数据库、关系方法等），我没有使用过snake case

现在我的主要问题是

我可以用电脑进入目标

@foreach($user->goals as $goal)
    {{ $goal }}
@endforeach

和$goal->strengthGoalDesc回报

{"id":"1","excersise":{"id":"1","name":"Leg Extension","type":"Resistance","variation":null,"equipment":"Machine","focus":"Legs","desc":"","video":null,"created_at":"2014-01-16 15:51:18","updated_at":"2014-01-16 15:51:18"},"sets":"4","reps":"10","weight":"70.00","created_at":"2014-01-16 15:51:16","updated_at":"2014-01-16 15:51:16"}

但是$goal->strengthGoalDesc->exercise只返回1，而$goal->strengthGoalDesc->execises->name只返回1

ErrorException
Trying to get property of non-object (View: /var/www/app/views/users/show.blade.php)

尝试像数组$goal->strengthGoalDesc['exercises']一样访问它只返回1

编辑：尝试访问name属性的代码

@elseif($goal->strengthGoalId !== null)
   <th>{{ 'Strength' }}</th>
   <th>

      Excersise: {{ $goal->strengthGoalDesc->excersise->name) }}
      Weight: {{ $goal->strengthGoalDesc->weight }}</br>
      Sets: {{ $goal->strengthGoalDesc->sets }}</br>
      Reps: {{ $goal->strengthGoalDesc->reps }}</br>
   </th>

和*var_dump（$goal->Strengthgoaldesc['exersise']*

null
string '1' (length=1)
null

---

注意

var_dump（）

给出的

null

输出。第一次和第三次尝试访问

$goal->stengtgoaldesc->exersise

时，

$goal->stengtgoaldesc

变量是

null

，这会导致错误异常

尝试将其包装在if语句中，检查

$goal->strengthGoalDesc

是否为空：

if( $goal->strengthGoalDesc !== null ) {
    var_dump( $goal->strengthGoalDesc->exercise );
}

---

这应该可以解决ErrorException。希望它能有所帮助。

我想这是一个结构问题（所有的数据看起来都不错，但你在一个糟糕的时刻调用它）

---

请查看您的foreach或粘贴更多代码。（在您尝试使用strengthGoalDesc的地方）您的问题是属性和关系名称重叠。您有一个名为

exercise

的数据库列以及一个名为相同的关系，属性优先于关系。请将该列重命名为

exerciseId

或其他名称

---

至于转换为snake_的情况，请尝试在您的模型或所有模型扩展的基础模型上设置

public static$snakeAttributes=false

。

执行

var_dump

以查看它是什么类型的对象。它可能是数组，而不是标准对象。尝试

$goal->strengthGoalDesc['excersise']

感谢您的快速回复$goal->strengthGoalDesc['excersise']简单地返回“1”，我已将var_dump的输出添加到我的问题中。它看起来像是一个对象，用于向您发送回复。我这里的特殊问题是，它不应为null，因为数据库中有该特定关系的信息。该信息由$goal->strengthGoalDesc返回（请参阅第5个代码块了解输出）但我无法单独访问某些代码块reason@Ir1sh我明白了。所以问题似乎在于模型之间的关系绑定，对吗？尝试使用

DB:：getQueryLog（）转储原始查询

。也许你会在那里找到答案-因为ORM并不总是按预期工作。抱歉，我应该补充一点，它被包装在if语句中原始查询是否让你走得更远？试着自己在数据库中运行它们，大多数情况下这有助于你更好地了解幕后发生的事情。

if( $goal->strengthGoalDesc !== null ) {
    var_dump( $goal->strengthGoalDesc->exercise );
}

@foreach($user->goals as $goal)
    {{ $goal }}
    $goal->strengthGoalDesc->excersise 
    //this will throw an error because not all Goals have strengthGoalDesc
@endforeach