Laravel

Question

我有一个 collection 个数组 (18)，它们都有关系 - question.

获取数据的函数：

 $auditResults = Audit::where('audit_id', $id)
     ->with('question', 'question.auditQuestion')
     ->get();

在问题数组中，我可以看到我想要访问的属性。当我尝试访问它时，我得到一个 Trying to get property of non-object

Collection:

Collection {#407 ▼
  #items: array:18 [▼
    0 => Audit {#411 ▶}
    1 => Audit {#412 ▶}
    2 => Audit {#413 ▶}
    ... shortened for brevity's sake
    14 => Audit {#425 ▶}
    15 => Audit {#426 ▶}
    16 => Audit {#427 ▶}
    17 => Audit {#428 ▶}
  ]
}

一个Audit的输出：

@foreach($auditResults as $answer)
    {{$answer}}
@endforeach

{  
       "id":1,
       "audit_id":1,
       "audit_questions_details_id":2,
       "question":{  
          "id":2,
          "audit_question_id":2,
          "question_number":1,
          "comment":1,
          "header":0,
          "created_at":"2017-03-27 12:16:50",
          "updated_at":"2017-03-27 12:16:50",
          "audit_question":{  
             "id":2,
             "audit_detail_id":1,
             "question":"Lorum Ipsum Dorum",
             "created_at":"2017-03-27 12:16:50",
             "updated_at":"2017-03-27 12:16:50"
          }
       },
       "score":null,
       "comment":null,
       "created_at":null,
       "updated_at":null
    }

如果我接着访问问题关系：

@foreach($auditResults as $answer)
    {{$answer->question}}
@endforeach

它只输出一个数字（我不确定它到底是什么！，因为我希望它输出问题关系）：

为什么它只输出一个数字，而它应该输出问题数组本身，如上所示？

当我尝试访问 question 关系时显示错误：

@foreach($auditResults as $answer)
    {{$answer->question->id}}
@endforeach

审核模型：

class Audit extends Model
{
    protected $fillable = [
        'audit_id', 'audit_questions_details_id', 'question', 'score', 'comment'
    ];

    public function auditScore()
    {
        return $this->belongsTo('App\AuditScore', 'id', 'audit_id');
    }

    public function question(){
        return $this->belongsTo(AuditQuestionDetail::class, 'audit_questions_details_id');
    }

}

审计模型数据：

AuditQuestionDetail 模型：

class AuditQuestionDetail extends Model
{
    protected $table = 'audit_questions_details';

    protected $fillable = [
        'audit_question', 'question_number', 'comment',
    ];

    public function auditQuestion()
    {
        return $this->hasOne(AuditQuestion::class, 'id', 'audit_question_id');
    }

    public function score()
    {
        return $this->hasMany(Audit::class);
    }
}

非常感谢。

Answer 1

我敢肯定，我发现了您的问题：您的 table 中有 question 字段用于模型 Audit，因此，由于某些原因，Laravel 将此字段优先于具有相同名称的关系 question。只需尝试重命名模型中的关系 Audit:

例如，改变这个

public function question(){
    return $this->belongsTo(AuditQuestionDetail::class, 'audit_questions_details_id');
}

对此：

// I know this isn't the best name, just for the test purposes
public function rquestion(){
    return $this->belongsTo(AuditQuestionDetail::class, 'audit_questions_details_id');
}

然后尝试：

@foreach($auditResults as $answer)
    {{$answer->rquestion}}
@endforeach

如果您将在此 foreach 中看到的不仅仅是数字，还有模型 AuditQuestionDetail 实例的 JSON，那么您可以使用此关系中的任何可用字段：

@foreach($auditResults as $answer)
    {{$answer->rquestion->id}}
@endforeach

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