Question

我有以下查询返回一个对象，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，这一切都很顺利

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

这里是一个为目标返回的内容示例，其中包含具有异常值的强度目标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被转换为蛇案？无论我做了什么（数据库，ralhiphip方法等），我都使用了蛇案。

现在我的主要问题

我可以通过

访问目标

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

和$ goal-＆gt; strengthGoalDesc返回

{"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$ goal-＆gt; strengthGoalDesc-＆gt; excersise只返回1和$ goal-＆gt; strengthGoalDesc-＆gt; excerises-＆gt; name gives

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

尝试访问它就像一个数组$ goal-＆gt; strengthGoalDesc ['excersises']只返回1

编辑：我试图访问名称属性的代码

@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>

我认为这可能是因为它是一个集合但是将它包装在foreach中只返回了一个无效的参数异常，因为它说它不是一个对象

我确信我会做一些愚蠢的事情，但这让我完全失去了

var_dump（$ goal-＆gt; strengthGoalDesc）输出

null
object(StrengthGoalDesc)[506]
  protected 'guarded' => 
    array (size=0)
      empty
  protected 'table' => string 'strengthGoalDescs' (length=17)
  protected 'connection' => null
  protected 'primaryKey' => string 'id' (length=2)
  protected 'perPage' => int 15
  public 'incrementing' => boolean true
  public 'timestamps' => boolean true
  protected 'attributes' => 
    array (size=7)
      'id' => string '1' (length=1)
      'excersise' => string '1' (length=1)
      'sets' => string '4' (length=1)
      'reps' => string '10' (length=2)
      'weight' => string '70.00' (length=5)
      'created_at' => string '2014-01-16 15:51:16' (length=19)
      'updated_at' => string '2014-01-16 15:51:16' (length=19)
  protected 'original' => 
    array (size=7)
      'id' => string '1' (length=1)
      'excersise' => string '1' (length=1)
      'sets' => string '4' (length=1)
      'reps' => string '10' (length=2)
      'weight' => string '70.00' (length=5)
      'created_at' => string '2014-01-16 15:51:16' (length=19)
      'updated_at' => string '2014-01-16 15:51:16' (length=19)
  protected 'relations' => 
    array (size=1)
      'excersise' => 
        object(Excersise)[480]
          protected 'guarded' => 
            array (size=0)
              ...
          protected 'table' => string 'excersises' (length=10)
          protected 'connection' => null
          protected 'primaryKey' => string 'id' (length=2)
          protected 'perPage' => int 15
          public 'incrementing' => boolean true
          public 'timestamps' => boolean true
          protected 'attributes' => 
            array (size=10)
              ...
          protected 'original' => 
            array (size=10)
              ...
          protected 'relations' => 
            array (size=0)
              ...
          protected 'hidden' => 
            array (size=0)
              ...
          protected 'visible' => 
            array (size=0)
              ...
          protected 'appends' => 
            array (size=0)
              ...
          protected 'fillable' => 
            array (size=0)
              ...
          protected 'dates' => 
            array (size=0)
              ...
          protected 'touches' => 
            array (size=0)
              ...
          protected 'observables' => 
            array (size=0)
              ...
          protected 'with' => 
            array (size=0)
              ...
          public 'exists' => boolean true
          protected 'softDelete' => boolean false
  protected 'hidden' => 
    array (size=0)
      empty
  protected 'visible' => 
    array (size=0)
      empty
  protected 'appends' => 
    array (size=0)
      empty
  protected 'fillable' => 
    array (size=0)
      empty
  protected 'dates' => 
    array (size=0)
      empty
  protected 'touches' => 
    array (size=0)
      empty
  protected 'observables' => 
    array (size=0)
      empty
  protected 'with' => 
    array (size=0)
      empty
  public 'exists' => boolean true
  protected 'softDelete' => boolean false
null

和* var_dump（$ goal-＆gt; stengthGoalDesc ['excersise'] *

null
string '1' (length=1)
null

Answer 1

注意null给出的var_dump()输出。第一次和第三次尝试访问$goal->stengthGoalDesc->excersise时。 $goal->stengthGoalDesc变量为null，导致 ErrorException 。

尝试将其包装在 if语句中，以检查$goal->strengthGoalDesc是否为空：

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

那应该解决ErrorException。希望它有所帮助。

Answer 2

我猜这是一个结构问题（所有数据看起来都不错，但你在一个糟糕的时刻称之为）

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

请查看您的foreach或粘贴更多代码。（您尝试使用strengthGoalDesc的地方）

Answer 3

您的问题是您有重叠的属性和关系名称。您有一个名为exercise的数据库列以及名称相同的关系，并且属性优先于关系。将列重命名为exerciseId或其他内容。

至于转换为snake_case，请尝试在模型上设置public static $snakeAttributes = false或所有模型扩展的基础模型。

访问懒惰的热切加载属性

3 个答案: