Laravel 5 menggunakan kueri mentah untuk mendapatkan hasil ke array

Saya memiliki pertanyaan dari database saya di mana saya ingin membuat hasilnya menjadi array, saya menggunakan laravel tetapi saya tidak menggunakan Eloquent karena saya hanya seorang pemula. Ini pertanyaan saya.

Pertanyaan:

 $array = array();

        $shippings = DB::table('shipping_table')
        ->select('*')
        ->leftJoin('shipping_products', function ($join) use ($array) {
            $join->on('shipping_products.shipping_id','=','shipping_table.shipping_id');
        })
        ->leftJoin('products', function ($join) use ($array) {
            $join->on('products.product_id', '=', 'shipping_products.product_id');
        })->get();

        dd($shippings);

Ini hasil kueri saya adalah ini:

Collection {#296 ▼
  #items: array:2 [▼
    0 => {#297 ▼
      +"shipping_id": 56
      +"shipping_date": null
      +"total_amount": 95000
      +"shipping_receiver": "Robert"
      +"shipping_address": "test"
      +"mobile_number": "09992238185"
      +"user_id": 1
      +"shipping_status": 0
      +"paywith": "paypal"
      +"id": 9
      +"product_id": 1
      +"quantity": 15
      +"subcategory_id": 1
      +"featured_img": "sample image1.jpg"
      +"product_name": "Product 1"
      +"description": "Product 1 desc"
      +"price": 46000.0
      +"status": "published"
      +"created_at": "2017-10-04 05:29:59"
      +"updated_at": "2017-10-04 05:29:59"
    }
    1 => {#287 ▼
      +"shipping_id": 56
      +"shipping_date": null
      +"total_amount": 95000
      +"shipping_receiver": "Robert"
      +"shipping_address": "Test"
      +"mobile_number": "09992238185"
      +"user_id": 1
      +"shipping_status": 0
      +"paywith": "paypal"
      +"id": 10
      +"product_id": 2
      +"quantity": 10
      +"subcategory_id": 1
      +"featured_img": "DSC04477-e1490885078524-200x300.jpg"
      +"product_name": "Product 2"
      +"description": "Product 2 desc"
      +"price": 49000.0
      +"status": "published"
      +"created_at": "2017-10-04 05:58:55"
      +"updated_at": "2017-10-04 05:58:55"
    }
  ]
}

Dengan hasil yang saya dapatkan, saya kurang puas karena saya ingin hasil seperti ini:

Collection {#296 ▼
  #items: array:1 [▼
    0 => {#297 ▼
      +"shipping_id": 56
      +"shipping_date": null
      +"total_amount": 95000
      +"shipping_receiver": "test"
      +"shipping_address": "tester"
      +"mobile_number": "09992238185"
      +"user_id": 1
      +"shipping_status": 0
      +"paywith": "paypal"
       #products: array:2 {
         0 => {
          +"product_id": 1
          +"quantity": 15
          +"subcategory_id": 1
          +"featured_img": "sample.jpg"
          +"product_name": "Product 1"
          +"description": "Product desc 1"
          +"price": 46000.0
          +"status": "published"
          +"created_at": "2017-10-04 05:29:59"
          +"updated_at": "2017-10-04 05:29:59" 
        }
        1 => {
          +"product_id": 2
          +"quantity": 10
          +"subcategory_id": 1
          +"featured_img": "DSC04477-e1490885078524-200x300.jpg"
          +"product_name": "Product 2"
          +"description": "Product Desc 2"
          +"price": 46000.0
          +"status": "published"
          +"created_at": "2017-10-04 05:29:59"
          +"updated_at": "2017-10-04 05:29:59" 
        }
    }

bagaimana aku bisa mencapai ini? tolong bantu saya membangun dengan kueri yang benar. Saya ingin menjadikan produk sebagai sub array

Inilah struktur tabel saya:

Tabel pengiriman:

Ship_ID (INT AUTO INC)
AMOUNT (DOUBLE,2)
NAME (VARCHAR)
SHIP_DATE (DATE)
RECEIVER (VARCHAR)

Pengiriman_produk:

ID (INT AUTO INC)
Ship_id (foreign key from shipping table)
Product_id

Produk_tabel:

Product_id (Auto Inc)
name(varchar)
Qty(int)
Description (varchar)