php - 如何在 Laravel 分页集合结果中添加自定义(新)列

Question

我正在创建一个 API，我想在分页查询的结果中添加额外的列。例如，我的数据库中有价格和折扣。我想发送包含结果集的 discounted_price 列。

这是我迄今为止尝试过的:

Controller :

$products = Products::latest()->paginate(10);
if (! empty($products)) {
    $final_prod = [];
    foreach ($products as $product) {
        $final_prod[] = $product->asFilterJson();
    }
    $data['products'] = $final_prod;
    $data['status'] = 200;
} else {
    $data['error'] = "No product available";
}

在我的产品模型中我有

public function asFilterJson() {
    $json = [];
    $json['id'] = $this->id;
    $json['title'] = $this->title;
    $json['category_id'] = $this->category_id;
    $json['price'] = $this->price;
    $json['description'] = $this->description;
    $json['quantity'] = $this->quantity;
    $json['discount'] = $this->discount;
    $json['type_id'] = $this->type_id;
    $json['created_by_id'] = $this->created_by_id;
    $json['created_at'] = $this->created_at;
    $json['updated_at'] = $this->updated_at;
    if($this->type_id == self::ITEM_SPECIAL) {
        $json['discounted_price'] = ($this->discount * $this->price) / 100;    }
    return $json;
}

它工作正常，但它删除了分页。

Answer 1

您可以使用 map 在集合对象中添加键和值方法

$products = Products::latest()->paginate(10);

$itemSpecial = self::ITEM_SPECIAL; //pass variable in closure by using use 

$products->map(function($item) use ($itemSpecial) {
     if($item->type_id == $itemSpecial) {
        $item->discounted_price = ($item->discount * $item->price) / 100; 
     }
     return $item;
});

you can used condition also in clourse