如何在 Laravel 的同一视图中检索或返回不同的记录？

Posted 2023-05-09

【中文标题】如何在 Laravel 的同一视图中检索或返回不同的记录？

【英文标题】：How can i retrieve or return different records on the same view in Laravel?

【发布时间】：2020-04-19 01:37:23

【问题描述】：

请尝试在仪表板视图中检索事件数据和学生数据，但它们似乎相互冲突。学生记录也显示在我的事件记录应该显示的位置。 看起来是这样的：

路线

Route::post('/dashboard/submit', 'EventController@submit');
Route::get('/dashboard', 'EventController@getevent');
Route::post('/dashboard/student/pay', 'PaymentController@submit');
Route::post('register','StudentRegister@register');
Route::get('/dashboard', 'StudentRegister@getStudents');

EventController.php

class EventController extends Controller

    public function submit(Request $request)
    
        $message = new Event;
        $message->title = $request->input('title');
        $message->deadline = $request->input('deadline');
        $message->message = $request->input('message');

        $message->save();

        return redirect('/dashboard')->with('status', 'Event Added');
    


    public function getevent()
    
        $msgevent = Event::orderBy('id', 'DESC')->get();

        return view('dashboard')->with('dashboard', $msgevent);
    

studentRegister.php

public function getStudents()
    $Students = Student::all();

    return view('dashboard') -> with('dashboard', $Students);

我的 dashboard.blade.php

中有这些

<div class="paginate-no-scroll 5">
    <div class="items">

        @if(count($dashboard) > 0)
        @foreach ($dashboard as $msg)
        <div>
            <svg class="bd-placeholder-img mr-2 rounded"   xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 32x32">
                <rect   fill="#007bff"/>
                <text x="50%" y="50%" fill="#007bff" dy=".3em"></text>
            </svg>
            <p class="media-body pb-3 mb-0 small lh-125 border-bottom border-gray">
                <strong class="d-block text-gray-dark">$msg -> title</strong> | $msg -> deadline |<b
                    style="color: #25027f"> @username</b> | <a href="#" style="text-decoration: underline;">Edit</a> |
                <a href="/delete/!! $msg -> id !!" style="text-decoration: underline;">Delete</a><br>
                $msg -> message
        </div>
        @endforeach
        @endif

        <table id="tableData" class="table table-bordered table-striped">
            <thead>
            <th>#</th>
            <th>Student ID</th>
            <th>First Name</th>
            <th>Last Name</th>
            <th>Action</th>
            </thead>

            @if(count($dashboard) > 0)
            @foreach ($dashboard as $std)
            <tr>
                <td style="text-align:center"><img src="uploads/$std->image" style="width: 50px;height: 50px; border-radius: 50%" ></td>
                <td style="text-align:center; padding-top: 25px;">$std->studentID</td>
                <td style="text-align:center; padding-top: 25px;">$std->fName</td>
                <td style="text-align:center; padding-top: 25px;">$std->surName</td>
                <td style="text-align:center; padding-top: 25px;"><a href="" class="btn btn-primary"> view</a>
                </td>
            </tr>
            @endforeach
            @endif

            </tbody>
        </table>

【参考方案1】：

为什么你用同名调用两个事件。你改变你的代码如下。

studentRegister.php

public function getStudents()

    $students = Student::all();
    $msgevents = Event::all()->orderBy('id', 'DESC');

    return view('dashboard', [
                     'students' => $students,
                     'msgevents' => $msgevents
               ]);

不要忘记在文件中添加use App\Event;。

dashboard.blade.php

<div class="paginate-no-scroll 5">
      <div class="items">

          @if(count($msgevents) > 0)
          @foreach ($msgevents as $msg)
        <div>


          <svg class="bd-placeholder-img mr-2 rounded"   xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 32x32"><rect   fill="#007bff"/><text x="50%" y="50%" fill="#007bff" dy=".3em"></text></svg>
          <p class="media-body pb-3 mb-0 small lh-125 border-bottom border-gray">
          <strong class="d-block text-gray-dark">$msg -> title</strong> | $msg -> deadline |<b style="color: #25027f"> @username</b> | <a href="#" style="text-decoration: underline;">Edit</a> | <a href="/delete/!! $msg -> id !!" style="text-decoration: underline;">Delete</a><br>
          $msg -> message

        </div>
         @endforeach
        @endif





<table id="tableData" class="table table-bordered table-striped">
          <thead>
    <th>#</th>
    <th>Student ID</th>
    <th>First Name</th>
    <th>Last Name</th>
    <th>Action</th>
  </thead>
    @if(count($students) > 0)
      @foreach ($students as $std)
  <tr>
    <td style="text-align:center"><img src="uploads/$std->image" style="width: 50px;height: 50px; border-radius: 50%" ></td>
    <td style="text-align:center; padding-top: 25px;" >$std->studentID</td>
    <td style="text-align:center; padding-top: 25px;">$std->fName</td>
    <td style="text-align:center; padding-top: 25px;">$std->surName</td>
    <td style="text-align:center; padding-top: 25px;"><a href="" class="btn btn-primary"> view</a> 
    </td>
  </tr>
      @endforeach
      @endif

  </tbody>
        </table>

【讨论】：

我得到未定义的变量：msgevents

现在我编辑了试试我的改变看看。从$msgevents = Event::orderBy('id', 'DESC')->get(); 到$msgevents = Event::all()->orderBy('id', 'DESC');。

这些是错误 [ * undefined variable:msgevents*, possible typo $msgevents 你的意思是 $students，最后修复错字]

你为什么要为同一个视图使用两个函数？有什么要求吗？否则我将更改代码。

删除一种方法，并在一种方法中同时添加。

【参考方案2】：

您在控制器中使用具有相同with 变量dashboard 的相同视图。

在 EventController.php 中 获取事件：

return view('dashboard') -> with('dashboard', $msgevent);

在 studentRegister.php 中 获取学生：

return view('dashboard') -> with('dashboard', $Students);

在相应的文件中将它们更改为更合适的名称，例如：

return view('dashboard') -> with('events', $msgevent);
return view('dashboard') -> with('students', $Students);

然后在您的 blade 文件中使用这些名称，例如：

<div class="paginate-no-scroll 5">
    <div class="items">

        @if($events && count($events) > 0)
        @foreach ($events as $msg)
        <div>
            <svg class="bd-placeholder-img mr-2 rounded"   xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 32x32">
                <rect   fill="#007bff"/>
                <text x="50%" y="50%" fill="#007bff" dy=".3em"></text>
            </svg>
            <p class="media-body pb-3 mb-0 small lh-125 border-bottom border-gray">
                <strong class="d-block text-gray-dark">$msg -> title</strong> | $msg -> deadline |<b
                    style="color: #25027f"> @username</b> | <a href="#" style="text-decoration: underline;">Edit</a> |
                <a href="/delete/!! $msg -> id !!" style="text-decoration: underline;">Delete</a><br>
                $msg -> message
        </div>
        @endforeach
        @endif

        <table id="tableData" class="table table-bordered table-striped">
            <thead>
            <th>#</th>
            <th>Student ID</th>
            <th>First Name</th>
            <th>Last Name</th>
            <th>Action</th>
            </thead>

            @if($students && count($students) > 0)
            @foreach ($students as $std)
            <tr>
                <td style="text-align:center"><img src="uploads/$std->image" style="width: 50px;height: 50px; border-radius: 50%" ></td>
                <td style="text-align:center; padding-top: 25px;">$std->studentID</td>
                <td style="text-align:center; padding-top: 25px;">$std->fName</td>
                <td style="text-align:center; padding-top: 25px;">$std->surName</td>
                <td style="text-align:center; padding-top: 25px;"><a href="" class="btn btn-primary"> view</a>
                </td>
            </tr>
            @endforeach
            @endif

            </tbody>
        </table>

【讨论】：

我现在得到未定义的变量：事件

由于我们使用相同的刀片文件在 2 个控制器中渲染，我们应该在使用前检查传入的变量是否存在到视图中。我已经更新了答案中的刀片文件以显示，例如：@if($events && count($events) > 0) 和 @if($students && count($students) > 0)。