BACKPACK Laravel 使用 Backpack CRUD 在多对多关系中管理 pivot table 中的额外列

Question

我正在为 laravel 使用背包，我正在尝试 add/update 在多对多关系中使用的枢轴 table 中的一些额外列。

总结上下文：我有一个模型 Task，另一个模型 Machine 和这个中间枢轴 table machine_task 包含 Task 和 Machine 之间的多对多关系

在这个machine_task中有machine_id,task_id然后是布尔列m（对于'monthly'），q（对于'quarterly'），b （对于 'biannual'）和 y（对于 'yearly'）。

这就是我的

在我的 Models/Task.php 中，我定义了 m-2-m 关系


   public function machines()
    {
        return $this->belongsToMany('App\Machine')->withPivot('m','q','b','y');
    }

在 /app/Http/Controllers/Admin/TaskCrudController.php 我有字段，最相关的是这个

       $this->crud->addField([   // n-n relationship
           'label' => "Machines", // Table column heading
           'type' => "select2_from_ajax_multiple_custom", // a customized field type modifying the standard select2_from_ajax_multiple type
           'name' => 'machines', // the column that contains the ID of that connected entity
           'entity' => 'machines', // the method that defines the relationship in your Model
           'attribute' => "name", // foreign key attribute that is shown to user
           'model' => "App\Models\Machine", // foreign key model
           'data_source' => url("api/machines"), // url to controller search function (with /{id} should return model)
           'placeholder' => "Select machine(s)", 
           'minimum_input_length' => 0, 
           'pivot' => true, 

           'dependencies' => ['building_id'], // this "Machines" field depends on another previous field value
           ]);

这非常有效：当我创建或更新任务时，AJAX 调用返回正确的结果，值被正确地添加到 select2 输入中，并且 pivot table machine_task 已正确填充并更新为 task_id 和 machine_id当我单击“保存并返回”按钮时。

但是如何将额外的值 m,q,b 插入主元 table 、y 与 task_id 和 machine_id 一起？

在TaskCrudController.php的最后我有

 public function store(StoreRequest $request)
    {
        // your additional operations before save here
        // What I should do here to get the pivot values into the request??????????????
        $redirect_location = parent::storeCrud($request);
        // your additional operations after save here
        // use $this->data['entry'] or $this->crud->entry
        return $redirect_location;
    }

    public function update(UpdateRequest $request)
    {
        // your additional operations before save here
        // What I should do here to get the pivot values into the request??????????????
        $redirect_location = parent::updateCrud($request);     
        // your additional operations after save here
        // use $this->data['entry'] or $this->crud->entry
        return $redirect_location;
    }

在我修改后的 select2_from_ajax_multiple 版本中，我为每个选定的选项添加了一些带有复选框的行。让我们在屏幕截图中看到更好的理解

select2_from_ajax_multiple_custom

在 /vendor/backpack/crud/src/resources/views/fields/select2_from_ajax_multiple_custom.blade.php 中，我像这样初始化值，然后使用 jquery 更新与select2 控件，但我不知道如何将 m、q、b、y 复选框与每个 select2 选定选项相关联并将它们传递给请求。

    @if ($old_value)
            @foreach ($old_value as $item)
                @if (!is_object($item))
                    @php
                        $item = $connected_entity->find($item);
                    @endphp
                @endif
                <div id="div{{ $item->getKey() }}">
                <span> {{ $item->getKey() }} {{ $item->{$field['attribute']} }} -- </span>
                Monthly <input type="checkbox" id="m{{ $item->getKey() }}" name="m{{ $item->getKey() }}" value="1" @php if ($item->pivot['m'] == "1") echo "checked"; @endphp > 
                Quarterly <input type="checkbox" id="q{{ $item->getKey() }}" name="q{{ $item->getKey() }}" value="1" @php if ($item->pivot['q'] == "1") echo "checked"; @endphp> 
                Biannual <input type="checkbox" id="b{{ $item->getKey() }}" name="b{{ $item->getKey() }}" value="1" @php if ($item->pivot['b'] == "1") echo "checked"; @endphp> 
                Yearly <input type="checkbox" id="y{{ $item->getKey() }}" name="y{{ $item->getKey() }}"value="1" @php if ($item->pivot['y'] == "1") echo "checked"; @endphp> <br/>
                @php
                @endphp
                </div>
            @endforeach
        @endif

非常感谢您抽出宝贵时间，希望您能帮助我！有点坚持这个！

Answer 1

我已经能够解决它，所以我会 post 解决方案，因为它可能对其他人有用。

我做了什么，

在我的TaskCrudController.php中，我添加了底层任务模型

// add this to the use statements 
use App\Models\Task;

然后，也是在TaskCrudController.php我做了这个

// Notice: You need to add this to "create" function as well, I'm just writing here the update function to keep it short.
 public function update(UpdateRequest $request)
    {
$redirect_location = parent::updateCrud($request);
foreach ($request->machines as $machine) {
            $set= array('m'=>'0','t'=> '0', 's' => '0', 'a' => '0');
            if (isset($request['m'])) in_array ($machine, $request['m']) ? $set['m'] = '1' :  $set['m'] = '0';
            if (isset($request['t'])) in_array ($machine, $request['t']) ? $set['q'] = '1' :  $set['q'] = '0';
            if (isset($request['s'])) in_array ($machine, $request['s']) ? $set['b'] = '1' :  $set['b'] = '0';
            if (isset($request['a'])) in_array ($machine, $request['a']) ? $set['y'] = '1' :  $set['y'] = '0';

            Task::find($request->id)->machines()->syncWithoutDetaching([$machine => $set]);
return $redirect_location;
        }

// Code explanation:
// what we are doing basically here is to grab the $request data
// For example: In the $request we receive m[3] b[1,3] y[1] arrays
// meaning that for our task:
// Machine 1 has no monthly, no quarterly but biannual and yearly checkboxes checked
// Machine 3 has monthly, no quarterly, biannual and no yearly checkboxes checked
// with the loop above, we cast that incoming data into this structure
// $set would contain after the loop:
// '1' => ['m' => '0', 'q'=> '0', 'b' => '1', 'y' => '1']
// '3' => ['m' => '1', 'q'=> '0', 'b' => '1', 'y' => '0']

// with that, we updated the intermediate table using syncWithoutDetaching

现在让我们看看 select2_from_ajax_multiple_custom.blade.php 虽然我没有 posting 所有代码（其余与 select2_from_ajax_multiple 标准字段相同)

<div @include('crud::inc.field_wrapper_attributes') >
   <label>{!! $field['label'] !!}</label>
   @include('crud::inc.field_translatable_icon')
   <select
       name="{{ $field['name'] }}[]"
       style="width: 100%"
       id="select2_ajax_multiple_custom_{{ $field['name'] }}"
       @include('crud::inc.field_attributes', ['default_class' =>  'form-control'])
       multiple>

       @if ($old_value)
           @foreach ($old_value as $item)
               @if (!is_object($item))
                   @php
                       $item = $connected_entity->find($item);
                   @endphp
               @endif
               <option value="{{ $item->getKey() }}" selected>
                   {{ $item->{$field['attribute']} }}
               </option>
           @endforeach
       @endif
   </select>
// What I added is:
   <div id="freq">
   @if ($old_value)
           @foreach ($old_value as $item)
               @if (!is_object($item))
                   @php
                       $item = $connected_entity->find($item);
                   @endphp
               @endif
               <div id="div{{ $item->getKey() }}">
               <span>{{ $item->{$field['attribute']} }} -- </span>
               Monthly <input type="checkbox" id="m{{ $item->getKey() }}" name="m[]" value="{{ $item->getKey() }}" @php if ($item->pivot['m'] == "1") echo "checked"; @endphp > 
               Quarterly <input type="checkbox" id="q{{ $item->getKey() }}" name="q[]" value="{{ $item->getKey() }}" @php if ($item->pivot['q'] == "1") echo "checked"; @endphp> 
               Biannual <input type="checkbox" id="b{{ $item->getKey() }}" name="b[]" value="{{ $item->getKey() }}" @php if ($item->pivot['b'] == "1") echo "checked"; @endphp> 
               Yearly <input type="checkbox" id="y{{ $item->getKey() }}" name="y[]"value="{{ $item->getKey() }}" @php if ($item->pivot['y'] == "1") echo "checked"; @endphp> <br/>

               </div>
           @endforeach
       @endif
   </div>


// js code to add or remove rows containing the checkboxes (This needs to be put inside <script> tags obviously)    $("#select2_ajax_multiple_custom_machines").on("select2:select", function(e) {
// add checkbox row
           htmlRow = "<div id=\"div"+e.params.data.id+"\">"+"<span> "+e.params.data.text+"-- </span>"+" Monthly <input type=\"checkbox\" id=\"m"+e.params.data.id+"\" name=\"m[]\" value=\""+e.params.data.id+"\">";
           htmlRow += " Quarterly <input type=\"checkbox\" id=\"q"+e.params.data.id+"\" name=\"q[]\" value=\""+e.params.data.id+"\">";
           htmlRow += " Biannual <input type=\"checkbox\" id=\"b"+e.params.data.id+"\" name=\"b[]\" value=\""+e.params.data.id+"\">";
           htmlRow += " Yearly <input type=\"checkbox\" id=\"y"+e.params.data.id+"\" name=\"y[]\" value=\""+e.params.data.id+"\"><br/>";
           htmlRow += "</div>";
           $("#freq").append(htmlRow);  
       });

$("#select2_ajax_multiple_custom_machines").on("select2:unselect", function(e) {
// remove checkbox row
           $("#div"+e.params.data.id).remove(); 
});

伙计们，仅此而已。希望对你有帮助。

BACKPACK Laravel 使用 Backpack CRUD 在多对多关系中管理 pivot table 中的额外列

BACKPACK Laravel manage extra columns in pivot table in a many-to-many relationship using Backpack CRUD

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