Question

我正在处理两个表。一个叫做transacciones，另一个叫做transaction_details 这是transacciones表

Schema::create('transacciones', function (Blueprint $table) {
        $table->increments('id');

        $table->string('modulo');

        $table->timestamps();
    });

这是transaction_details表

Schema::create('transaction_details', function (Blueprint $table) {
        $table->integer('transacciones_id')->unsigned();

        $table->string('accion');
        $table->string('variable');
        $table->string('anterior')->nullable();
        $table->string('nuevo')->nullable();

        $table->foreign('transacciones_id')
            ->references('id')
            ->on('transacciones')
            ->onDelete('cascade');

        $table->timestamps();
    });

我正在尝试使用控制器文件中的以下代码传递数据以进行查看：

public function Transactions()
    {
        $logs = Transacciones::with('details')->get();
        return view('transacciones', compact('logs'));
    }

在模型文件中

@foreach($logs as $key => $log)

<tr>
    <td>{{ $log->id }}</td> //-> Works well

    <td>{{$log->details->accion}}</td> ->It doesn't work
    <td>{{$log->details->variable}}</td> ->It doesn't work
    <td>{{$log->details->anterior}}</td> ->It doesn't work
    <td>{{$log->details->nuevo}}</td> ->It doesn't work

    <td>{{ucfirst( $log->modulo) }}</td> //-> Works well
</tr>
@endforeach

在这种情况下，尝试打印时将返回错误： 此收藏实例上不存在属性[accion]。

我知道此错误是因为详细信息是一个集合。因此，它没有获得action参数，其余的都没有。我了解可以通过执行foreach to $logs->details as $detail解决此问题，但这会使整个电路板变形，看起来像这样 Deformed table by nested foreach

是否可以像Laravel文档中那样仅用一个foreach来完成所有这些工作？让我们留下这样的东西

<td>{{$log->details->accion}}</td>
<td>{{$log->details->varialbe}}</td>
<td>{{$log->details->anterior}}</td>
<td>{{$log->details->nuevo}}</td>

我是Laravel的新手。我只用了很短的时间。希望您能帮我解决这个问题，事实是我有24个多小时遇到同样的问题，不知道如何解决。

编辑：添加了dd（$ logs）

Collection {#1075 ▼
  #items: array:4 [▼
    0 => Transacciones {#913 ▶}
    1 => Transacciones {#914 ▼
      #table: "transacciones"
      #fillable: array:2 [▶]
      #connection: "mysql"
      #primaryKey: "id"
      #keyType: "int"
      +incrementing: true
      #with: []
      #withCount: []
      #perPage: 15
      +exists: true
      +wasRecentlyCreated: false
      #attributes: array:4 [▼
        "id" => 2
        "modulo" => "Usuarios"
        "created_at" => "2018-11-24 05:53:19"
        "updated_at" => "2018-11-24 05:53:19"
      ]
      #original: array:4 [▶]
      #changes: []
      #casts: []
      #dates: []
      #dateFormat: null
      #appends: []
      #dispatchesEvents: []
      #observables: []
      #relations: array:1 [▼
        "details" => Collection {#1072 ▼
          #items: array:6 [▼
            0 => Transaction_Detail {#1043 ▼
              #table: "transaction_details"
              #fillable: array:4 [▶]
              #connection: "mysql"
              #primaryKey: "id"
              #keyType: "int"
              +incrementing: true
              #with: []
              #withCount: []
              #perPage: 15
              +exists: true
              +wasRecentlyCreated: false
              #attributes: array:7 [▼
                "transacciones_id" => 2
                "accion" => "<Escribir>"
                "variable" => "nombres"
                "anterior" => "Joaquin Moises"
                "nuevo" => "Isaac Rosalind"
                "created_at" => "2018-11-24 05:53:19"
                "updated_at" => "2018-11-24 05:53:19"
              ]
              #original: array:7 [▶]
              #changes: []
              #casts: []
              #dates: []
              #dateFormat: null
              #appends: []
              #dispatchesEvents: []
              #observables: []
              #relations: []
              #touches: []
              +timestamps: true
              #hidden: []
              #visible: []
              #guarded: array:1 [▶]
            }
            1 => Transaction_Detail {#1044 ▶}
            2 => Transaction_Detail {#1045 ▶}
            3 => Transaction_Detail {#1046 ▶}
            4 => Transaction_Detail {#1047 ▶}
            5 => Transaction_Detail {#1048 ▶}
          ]
        }
      ]
      #touches: []
      +timestamps: true
      #hidden: []
      #visible: []
      #guarded: array:1 [▶]
    }
    2 => Transacciones {#915 ▶}
    3 => Transacciones {#916 ▶}
  ]
}

Answer 1

我认为您已经定义了一对多关系，因此您必须再次循环以显示所有关系。您确定这是您想要的关系，而不是一对一的关系吗？看一下laravel文档中的关系。 laravel relationships

这里也有错字 <td>{{$log->details->varialbe}}</td> ->It doesn't work 它是您在迁移中指定的变量 $table->string('variable');

如何在Laravel中分解关系集合

1 个答案: