為什么“ @foreach（$ pastRegistrations as $ pastRegistration）”也返回結果？

Question

我有一個UserController，它具有index（）方法來獲取auth用戶在會議中的過去和下一次注冊。

然后，在視圖中，我在一個標簽中顯示下一個注冊，在另一個標簽中顯示過去的注冊。

db上只有一個會議，其結束日期為“ 2018-06-15 15:30:00”。 用戶在該會議中只有一個注冊。

因此，日期為“ 2018-06-15 15:30:00”的是下一個注冊，但在過去的選項卡中，注冊用戶中還會出現日期為“ 2018-06-15 15”的會議中的用戶注冊： 30:00" 。 但是它應該僅顯示在下一個注冊選項卡中，因為它是下一個注冊。

您知道為什么foreach“ @foreach($pastRegistrations as $pastRegistration) ”也返回結果嗎？

因此，我在一節中顯示了過去的注冊：

@foreach($pastRegistrations as $pastRegistration)
    @if(!empty($pastRegistration->conference || !empty($pastRegistration->conference->start_date)))
        <li class="list-group-item">
            <h5>{{optional($pastRegistration->conference)->name}}</h5>
        </li>
    @endif
@endforeach
<div class="text-center d-flex justify-content-center mt-3">
    {{$pastRegistrations->fragment('pastConferences')->links("pagination::bootstrap-4")}}
</div>

並顯示下一個注冊：

@foreach($nextRegistrations as $nextRegistration)
    @if(!empty($nextRegistration->conference || !empty($nextRegistration->conference->start_date)))

        <li class="list-group-item">
            <h5>{{optional($nextRegistration->conference)->name}}</h5>
            @if ($nextRegistration->status === 'I')
                <a href="{{route('conferences.payment',
                ['id' => $nextRegistration->conference->id,
                'regID'=> $nextRegistration->id])}}"
                   class="btn btn-primary ml-2">Pay
                </a>
            @endif
        </li>
    @endif
@endforeach
<div class="text-center d-flex justify-content-center mt-3">
           {{$nextRegistrations->fragment('nextConferences')->links("pagination::bootstrap-4")}}
</div>

UserController index（）返回過去和下一個注冊：

class UserController extends Controller
{
    public function index(Request $request){

        $pageLimit = 5;
        $user = $request->user();

        $pastRegistrations = $user->registrations()->with(['conference' => function ($query) {
            $query->where('end_date', '<', now());
        }])->paginate($pageLimit);

        $nextRegistrations = $user->registrations()->with(['conference' => function ($query) {
            $query->where('end_date', '>', now());
        }])->paginate($pageLimit);

        return view('users.index',
            compact('user', 'pastRegistrations','nextRegistrations'));
    }

“ dd（$ pastRegistrations）;” 說明：

LengthAwarePaginator {#276 ▼
  #total: 1
  #lastPage: 1
  #items: Collection {#272 ▼
    #items: array:1 [▼
      0 => Registration {#270 ▼
        #fillable: array:3 [▶]
        #connection: "mysql"
        #table: null
        #primaryKey: "id"
        #keyType: "int"
        +incrementing: true
        #with: []
        #withCount: []
        #perPage: 15
        +exists: true
        +wasRecentlyCreated: false
        #attributes: array:6 [▼
          "id" => 1
          "status" => "C"
          "conference_id" => 1
          "main_participant_id" => 1
          "created_at" => "2018-06-14 00:09:39"
          "updated_at" => "2018-06-14 00:09:39"
        ]
        #original: array:6 [▶]
        #changes: []
        #casts: []
        #dates: []
        #dateFormat: null
        #appends: []
        #dispatchesEvents: []
        #observables: []
        #relations: array:1 [▼
          "conference" => null
        ]
        #touches: []
        +timestamps: true
        #hidden: []
        #visible: []
        #guarded: array:1 [▶]
      }
    ]
  }
  #perPage: 5
  #currentPage: 1
  #path: "http://proj.test/user/profile"
  #query: []
  #fragment: null
  #pageName: "page"
}

“ dd（$ nextRegistrations）;” 說明：

LengthAwarePaginator {#279 ▼
  #total: 1
  #lastPage: 1
  #items: Collection {#274 ▼
    #items: array:1 [▼
      0 => Registration {#280 ▼
        #fillable: array:3 [▶]
        #connection: "mysql"
        #table: null
        #primaryKey: "id"
        #keyType: "int"
        +incrementing: true
        #with: []
        #withCount: []
        #perPage: 15
        +exists: true
        +wasRecentlyCreated: false
        #attributes: array:6 [▼
          "id" => 1
          "status" => "C"
          "conference_id" => 1
          "main_participant_id" => 1
          "created_at" => "2018-06-14 00:09:39"
          "updated_at" => "2018-06-14 00:09:39"
        ]
        #original: array:6 [▶]
        #changes: []
        #casts: []
        #dates: []
        #dateFormat: null
        #appends: []
        #dispatchesEvents: []
        #observables: []
        #relations: array:1 [▼
          "conference" => Conference {#281 ▼
            #fillable: array:18 [▶]
            #dates: array:2 [▶]
            #appends: array:1 [▶]
            #connection: "mysql"
            #table: null
            #primaryKey: "id"
            #keyType: "int"
            +incrementing: true
            #with: []
            #withCount: []
            #perPage: 15
            +exists: true
            +wasRecentlyCreated: false
            #attributes: array:23 [▶]
            #original: array:23 [▶]
            #changes: []
            #casts: []
            #dateFormat: null
            #dispatchesEvents: []
            #observables: []
            #relations: []
            #touches: []
            +timestamps: true
            #hidden: []
            #visible: []
            #guarded: array:1 [▶]
          }
        ]
        #touches: []
        +timestamps: true
        #hidden: []
        #visible: []
        #guarded: array:1 [▶]
      }
    ]
  }
  #perPage: 5
  #currentPage: 1
  #path: "http://proj.test/user/profile"
  #query: []
  #fragment: null
  #pageName: "page"
}

Answer 1

問題可能出在@第2行：

@if(!empty($pastRegistration->conference || !empty($pastRegistration->conference->start_date)))

代替

@if(!empty($pastRegistration->conference) || !empty($pastRegistration->conference->start_date))

Answer 2

看看whereHas方法。 它使您可以基於相關模型的約束來限制結果。

嘗試這個：

    $pastRegistrations = $user->registrations()->whereHas('conference', function ($query) {
        $query->where('end_date', '<', now());
    })->paginate($pageLimit);

    $nextRegistrations = $user->registrations()->whereHas('conference', function ($query) {
        $query->where('end_date', '>', now());
    })->paginate($pageLimit);

Answer 3

約翰（John），比較日期總是有些麻煩，我想查詢無法為您提供正確的信息。 幸運的是，Laravel在Eloquent中有一個內置的解決方案，可以使生活變得更輕松：whereDate（） Docs（在頁面下方約2/3）

嘗試將查詢更改為Laravel whereDate函數：

$pastRegistrations = $user->registrations()->whereHas('conference', function ($query) {
        $query->whereDate('end_date', '<', now());
    })->paginate($pageLimit);

此外，內置的\\ Carbon函數可能值得研究，因為它們還可以使生活變得更加輕松。 如果使用它們，則只需將now()更改為\\Carbon\\Carbon::now()

在一個簡單的查詢上使用whereDate方法，看看是否確實是麻煩所在。