获取子类别下的产品数量以及子类别中主类别的总数量

Question

如果子类别中有产品，我想统计该子类别的父类别中的所有产品。 例如：

1. 类别1（总产品10）//我如何获得它

   • 类别1.1（总产品5）

   • 类别1.2（总产品3）

   • 类别1.3（总产品2）

Json代码：

id: 291,
    level: 1,
    parent_id: null, //parent category
    name: "Chemicals",
    bn_name: null,
    sector: "product",
    slug: "Chemicals",
    status: "active",
    created_at: "2021-04-16T23:53:52.000000Z",
    updated_at: "2021-04-16T23:53:52.000000Z",
    **products_count: 0,**
    total_items: 1,
    sub_categories: [
    
    id: 292,
    level: 2,
    parent_id: 291,
    name: "Activated Carbon",
    bn_name: null,
    sector: "product",
    slug: "Activated-Carbon",
    status: "active",
    created_at: "2021-04-16T23:53:52.000000Z",
    updated_at: "2021-04-16T23:53:52.000000Z",
    products_count: 0,
    total_items: 0,
    sub_categories: [ ]
    },
    {
    id: 293,
    level: 2,
    parent_id: 291,
    name: "Adhesives & Sealants",
    bn_name: null,
    sector: "product",
    slug: "Adhesives-&-Sealants",
    status: "active",
    created_at: "2021-04-16T23:53:52.000000Z",
    updated_at: "2021-04-16T23:53:52.000000Z",
    products_count: 0,
    total_items: 0,
    sub_categories: [ ]
    },
    {
    id: 294,
    level: 2,
    parent_id: 291,
    name: "Agro Chemicals",  //child category
    bn_name: null,
    sector: "product",
    slug: "Agro-Chemicals",
    status: "active",
    created_at: "2021-04-16T23:53:52.000000Z",
    updated_at: "2021-04-16T23:53:52.000000Z",
    **products_count: 1,**
    total_items: 1,
    sub_categories: [ ]
}

控制器代码是：

return $categories = Category::rootCategories()->with('subCategories')->withCount('products')->orderBy('name', 'ASC')->get();

类别型号：

public static function rootCategories() {
    return self::whereNull('parent_id')->where('status', 'active')->orderBy('name', 'ASC');
}

public static function productRootCategories() {
    return self::whereNull('parent_id')->where(['status' => 'active', 'sector' => 'product'])->orderBy('name', 'asc');
}

public function subCategories() {
    return $this->hasMany(self::class, 'parent_id')->where('status', 'active')->with('subCategories')->withCount('products')->orderBy('name', 'asc');
}

Answer 1

您可以通过两种方式做到这一点。

1. 只需在产品表中添加category_id 列稍微更改一下数据库关系，并在添加新产品时指定类别即可。这是最简单、最容易的方法，因为当你想统计一个类别的所有产品时，只需在类别模型中添加 hasMany 函数即可轻松获得 -

   public function products()
   {
    return $this->hasMany(Product::class);
   }
   

   并在产品模型中添加belongsTo函数 -

   public function category()
   {
    return $this->belongsTo(Category::class);
   }
   

   您已设置完毕，现在像这样调用控制器 -

    use App\Models\Category;
   
    $category = Category::find(your_category_id);
    $category_products = count($category->products);
   

   就完成了，简单。

2. 如果你的产品表中没有类别列，并且你已经在产品表中添加了大量数据，那么使用 eloquent collection 和 foreach 循环来计算产品-

   首先在子类别的类别模型中添加 hasMany 函数 -

   public function subCategories()
   {
    return $this->hasMany(SubCategory::class);
   }
   

   然后是类别的子类别模型中的logsTo函数 -

   public function category()
    {
      return $this->belongsTo(Category::class);
    }
   

   并在 SubCategory 中为定义 subcategory_id 的产品添加 hasMany 函数 -

    public function products()
    {
      return $this->hasMany(Product::class, 'subcategory_id');
    }
   

   完成！现在在控制器中使用此方法来按您的类别获取产品并对其进行计数。

    $category = Category::findOrFail(your_category_id);
   
    $result = array();
    foreach ($category->subCategories as $key => $sub) {
        array_push($result, $sub->products->toArray());
    }
   
    $products = call_user_func_array('array_merge', $result);
    return count($products);
   

   如果您还想获取所有类别数据，请像这样使用 -

    $data = array();
    $categories = Category::all();
    foreach ($categories as $category) {
        $result = array();
        foreach ($category->subCategories as $key => $sub) {
            array_push($result, $sub->products->toArray());
        }
   
        $products = call_user_func_array('array_merge', $result);
        $data[$category->id] = count($products);
    }
   
    return $data;
   

   现在您将获得产品总数:)