无论收到多少记录，如何循环一定次数（Laravel）

Question

我有以下查询：

      @php
     $age_id = \App\Goalage::where('goal_id',$cat_fil->id)->pluck('age_id');
     $age_name = \App\Age::wherein('rangeid',$age_id)->groupby('rangeid')->get();
     @endphp

以及以下 If 条件和 foreach：

                   @if(count($age_name) > 4 ) 
                           @foreach($age_name as $agename)
                        <button type="button" class="btn btn-outline-primary btn-sm-new mr-1"> 
                         {{$agename->agerange}} yrs
                        </button>
                          @endforeach
                     <a href="{{some.route}}">Click here for more than 4 results <a>
                  @else
                  //same code but will show 4 results or less

                   @endif

如何将以下语法更改为仅循环/显示 foreach 中的前 4 个结果，即使还有更多结果？

@foreach($age_name as $agename)

Answer 1

你可以做这样的事情在 4 次迭代后打破循环
在foreach循环中添加这个

  @if($loop->iteration > 4)

    @break

  @endif

或者，您可以针对 Laravel 5.2 执行此操作

@php
    $count = 0;
@endphp
@foreach($age_name as $agename)
    @if($count >= 4 )
        @break
    @endif
    <button type="button" class="btn btn-outline-primary btn-sm-new mr-1"> 
    {{$agename->agerange}} yrs
    </button>
    @php
     $count++;
    @endphp
@endforeach

Answer 2

使用take()或limit()从查询中提取一定数量的记录：

$age_name = \App\Age::wherein('rangeid',$age_id)->groupby('rangeid')->take(4)->get();

或者

$age_name = \App\Age::wherein('rangeid',$age_id)->groupby('rangeid')->limit(4)->get();

编辑：

使用$loop->iteration来获取循环的当前迭代，并在它达到某个迭代时中断，在你的情况下是4 。

@if(count($age_name) > 4 ) 
  @foreach($age_name as $agename)
      @if($loop->iteration > 4)
          @break;
      @endif
      <button type="button" class="btn btn-outline-primary btn-sm-new mr-1"> 
      {{$agename->agerange}} yrs
      </button>
  @endforeach
      <a href="{{some.route}}">Click here for more than 4 results <a>
@else
   //same code but will show 4 results or less
@endif