如何为所有模型动态更改检索到的数据

发布于 2025-01-20 13:17:10 字数 347 浏览 0 评论 0原文

每次从数据库检索记录时，我都想拦截观察者中的数据，以便可以更改其值，然后将更改后的记录返回给控制器。

我目前有一个基本模型，我在其中设置了一个观察者，以便每次检索数据时，它都会触发以下代码：

public function retrieved($data)
{
    $data->field = 'new value';
//return to controller
}

问题是检索到的事件发生在控制器接收数据之后，这意味着任何更改对模型所做的操作对控制器不可用。

无论如何，是否可以将这些更改后的数据发送回控制器。我是否以正确的方式处理这件事？对于我的目标有更好的解决方案吗？

原文

Every time records are retrieved from the database, I want to intercept the data in the observer so that I can change its value, then return the altered records to the controller.

I currently have a base model where I have set up an observer, so that every time data is retrieved, it triggers the following bit of code :

public function retrieved($data)
{
    $data->field = 'new value';
//return to controller
}

The problem is that the retrieved event happens after the controller receives the data, which means that any alterations made to the model are not available to the controller.

Is there anyway to send this altered data back to the controllers. Am I even going about this the right way ? Is there a better solution for my aims ?

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不再让梦枯萎 2025-01-27 13:17:10

在这种情况下，登录器似乎是一个不错的选择，因为您想在访问属性时修改结果。突变器是为了更新属性值时要修改值时。

要检索原始值，您可以使用$ someobj--＆gt; getRaworiginal（'属性'）;

，您可以将自定义属性附加到模型（使用class property $ appends ）如果需要，可以与自己的登录器。

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伤痕我心 2025-01-27 13:17:10

也许您应该查看 laravel突变器

由于您正在使用Laravel 8，所以您应该使用Laravel 8使用旧学校定义突变器的方式。

像这样：

class SomeModel {
  ...
    /**
    * Get field attribute
    * Called when controller or view calls `->field` property
    * If you want to make it work on `some_field` then, rename it with `getSomeFieldAttribute`
    */
    public function getFieldAttribute($current_field_value)
    {
      // return whatever you want after calculation
      return 'new value ' . $current_field_value;
    }
  ...
}

使用相同的逻辑您也可以使用setFieldAttribute funtion。

Maybe you should look at Laravel mutators

Since you are using laravel 8, you should use old school way of defining mutators.

Like this:

class SomeModel {
  ...
    /**
    * Get field attribute
    * Called when controller or view calls `->field` property
    * If you want to make it work on `some_field` then, rename it with `getSomeFieldAttribute`
    */
    public function getFieldAttribute($current_field_value)
    {
      // return whatever you want after calculation
      return 'new value ' . $current_field_value;
    }
  ...
}

With same logic you can use setFieldAttribute funtion as well.

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嗼ふ静 2025-01-27 13:17:10

我认为您需要的是变压器，它将转换您从数据库或某些源检索到的数据，然后可以在同一控制器中使用或传递到不同功能（控制器）。

看一下分形变压器

somemodeltransformer.php

<?php

namespace App\Transformers;

use App\Models\SomeModel;
use League\Fractal\TransformerAbstract;

class SomeModelTransformer extends TransformerAbstract
{
    /**
     * A Fractal transformer.
     *
     * @param SomeModel $someModel
     * @return array
     */
    public function transform(SomeModel $someModel): array
    {
        return [
            'name' => $someModel->name . " world",
        ];
    }
}

somemodel。 php

<?php

namespace App\Models;

class SomeModel {
    public $name;

    public function __construct($name)
    {
        $this->name = $name;
    }

}

use App\Models\SomeModel;
use App\Transformers\SomeModelTransformer;

$someModel = new SomeModel('hello');
$transformedData = (new SomeModelTransformer)->transform($someModel);

$ transformeddata

[
  "name" => "hello world",
]

I think what you need is a transformer, that will transform the data that you retrieved from the DB or some source, which can then be used within the same controller or passed on to different functions (controller).

Have a look at Fractal Transformers

SomeModelTransformer.php

<?php

namespace App\Transformers;

use App\Models\SomeModel;
use League\Fractal\TransformerAbstract;

class SomeModelTransformer extends TransformerAbstract
{
    /**
     * A Fractal transformer.
     *
     * @param SomeModel $someModel
     * @return array
     */
    public function transform(SomeModel $someModel): array
    {
        return [
            'name' => $someModel->name . " world",
        ];
    }
}

SomeModel.php

<?php

namespace App\Models;

class SomeModel {
    public $name;

    public function __construct($name)
    {
        $this->name = $name;
    }

}

use App\Models\SomeModel;
use App\Transformers\SomeModelTransformer;

$someModel = new SomeModel('hello');
$transformedData = (new SomeModelTransformer)->transform($someModel);

$transformedData