Question

我有Product和Category模型一对多地捆绑在一起。如何按类别过滤产品？在模板中，我有

 <a href="{{ route('product.productsByCategory', $category->id) }}" class="list-group-item">{{ $category->name }}</a>

如何编写函数来过滤具有类别的产品？

 public function productsByCategory($category_id){
   $products = Product:: ????
   return view("layouts._productsByCategory", compact("products"));

答案是

$products = Product::where('category_id', $category_id)->get();

Answer 1

您可以使用：

$products = Product::where('category_id', $category_id)->get();

或

$products = Product::whereHas('category', function($q) use ($category_id) {
               $q->where('id', $category_id);
           });

假设您在category模型中设置了Product关系。

Answer 2

您可能会发现通过类别更容易：

public function productsByCategory($category_id){
    return view("layouts._productsByCategory", [
       'products' => Category::with('products')->find($category_id)->products
    ]);
}

Laravel过滤一对多关系

2 个答案: