Question

我想从每个类别中提取 2 个产品。

Product.php

class Product extends Model
{ 
   protected $table = 'products';
}

类别.php

class Category extends Model {
    protected $table = 'categories';
}

控制器

public function index() {
    $products = Product::all();
    return Product::latest()->take(5)->get();
}

Answer 1

这应该获取每个类别的前两个产品：

// Get all categories
$categories = Category::all();

//Create an empty array to store our product IDs
$prodIds = array();

// Extract the first 2 product IDs in each category
foreach ($categories as $category) {
    $prodIds[] = $category->products->take(2)->pluck('id');
}

// Fetch products from their IDs
$products = Product::findMany($prodIds);

编辑：我上面的回答应该有效，如果该类别没有至少两个产品，它将失败。要解决此问题，您需要从 $prodIds 中删除空值。

Answer 2

Product.php

class Product extends Model
{ 
   protected $table = 'products';

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

注意：在类别模型中导入您的类别模型

类别.php

class Category extends Model {
    protected $table = 'categories';

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

注意：在产品模型中导入您的类别模型

控制器

public function index() {
   
    return Category::with('Product'=>funcation($obj){
        return $obj->take(2);
    })->latest()->take(5)->get();
}

Answer 3

试试这个

$products = Product::latest()->take(2)->with('categories')->get();

如何从每个类别中获取 2 个产品

3 个答案: