invoiceninja/app/Http/Controllers/QuoteApiController.php

<?php

namespace App\Http\Controllers;

use App\Models\Invoice;
use App\Ninja\Repositories\InvoiceRepository;
use Response;

class QuoteApiController extends BaseAPIController
{
    protected $invoiceRepo;

    protected $entityType = ENTITY_INVOICE;

    public function __construct(InvoiceRepository $invoiceRepo)
    {
        parent::__construct();

        $this->invoiceRepo = $invoiceRepo;
    }

     /**
      * @SWG\Get(
      *   path="/quotes",
      *   tags={"quote"},
      *   summary="List of quotes",
      *   @SWG\Response(
      *     response=200,
      *     description="A list with quotes",
      *      @SWG\Schema(type="array", @SWG\Items(ref="#/definitions/Invoice"))
      *   ),
      *   @SWG\Response(
      *     response="default",
      *     description="an ""unexpected"" error"
      *   )
      * )
      */
     public function index()
     {
         $invoices = Invoice::scope()
                         ->withTrashed()
                         ->quotes()
                         ->with('invoice_items', 'client')
                         ->orderBy('created_at', 'desc');

         return $this->listResponse($invoices);
     }
}