How get the nested model's response in get method on FAST API

i want to get the nested response in FAST API after creating,

def createOrderPlace(request: OrderCreatePlaceOrder, db: Session):

        
            x = format(random.randint(10000,99999), '04d')
            exists_x=db.query(OrderModel).filter(OrderModel.order_id == x).first()
            if exists_x:
                x = format(random.randint(10000,99999), '04d') 
     
            order_create = OrderModel(
                user_id=request.currentUser.user_id,
                name=request.currentUser.name,
                email=request.currentUser.email,
                orderAmount=request.subtotal,
                cvv_id=request.currentUser.cvv_id,
                name_on_card=request.currentUser.card_name,
                card_numbr=request.currentUser.card_number,
                card_month=request.currentUser.card_month,
                card_year=request.currentUser.card_year,
                order_id=x,
            )

            

            db_orderid = (
                db.query(OrderModel)
                .filter(OrderModel.user_id == request.currentUser.user_id)
                .first()
            )


            for dic in request.cartItems:
                order_item_a = OrderItemsModel(
                    name=dic.item_name,
                    quantity=dic.item_quantity,
                    price=dic.item_price,
                    decscription=dic.item_decscription,
                    product_type=dic.item_product_type,
                )

                db.add(order_item_a)
            db.add(shipping_a)
            db.add(order_create)
            db.commit()
        

            return request

here is my response after creating

{
  "currentUser": {
    "user_id": 0,
    "name": "string",
    "email": "string",
    "product_is_active": true,
    "billing_first_name": "string",
    "billing_last_name": "string",
    "billing_phone_number": "string",
    "billing_country": "string",
    "billing_division": "string",
    "billing_district": "string",
    "billing_address": "string",
    "billing_police_station": "string",
    "billing_post_code": 0,
    "shipping_first_name": "string",
    "shipping_last_name": "string",
    "shipping_phone_number": "string",
    "shipping_country": "string",
    "shipping_division": "string",
    "shipping_district": "string",
    "shipping_address": "string",
    "shipping_police_station": "string",
    "shipping_post_code": 0,
    "cvv_id": 0,
    "card_name": "string",
    "card_number": "string",
    "card_month": 0,
    "card_year": 0
  },
  "cartItems": [
    {
      "item_id": 0,
      "item_name": "string",
      "item_price": 0,
      "item_description": "string",
      "user_id": 0
    }
  ],
  "subtotal": 0
}

but I don't know how to get the exact same response in get method,in fastapi serach for how to get the nested response, but the problem is i need the exact response in get method. help me to get the same response in get method