在 Laravel 中，我的表列被连接覆盖，我该如何解决？

Question

I have a mini problem in my application...
I want to get all products from the products table along with the category name from the categories table and get stock of each product from products_attribute table...
the problem is product table id overwrite with products_attribute id. In the product_attributes table, only 116 rows but products table has 177 rows and the loop gets only 116 rows with products_attribute id.

Product Table (Screenshot)

Product Attributes Table (Screenshot)

Categories Table (Screenshot)

public function viewProducts(Request $request)
{
    $products = Product::join('categories', 'categories.id', 'products.category_id')->join('products_attributes', 'products_attributes.product_id', 'products.id')->get();
    $products = json_decode(json_encode($products));

    return view('admin.products.view_products')->with(compact('products'));
}

Answer 1

Laravels join function default is inner join so You will need to use the leftJoin method. (See \\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Query\\Builder@join )

Answer 2

我希望它会有所帮助.. 如何使用left join ：

$products = Product::join('categories', 'categories.id', 'products.category_id')->leftjoin('products_attributes', 'products_attributes.product_id', 'products.id')->get();

Answer 3

You have to use aliases to preserve columns from the base table that will be overwritten by your joining table(s):

$products = Product::select('*', \DB::raw("product.id as product_id"))->join('categories', 'categories.id', '=', 'product.id')->get();

You can then access the product id using: $product->product_id