feat: error_code + api doc + printing-job fields

api_v2/tests.py

@@ -171,6 +171,8 @@ class PrintingJobByCustomerAPITest(TestCase):
             customer=self.customer,
             fabric='棉',
             width='150cm',
+            curve='曲线A',
+            new_curve='新曲线A',
             external_order_id='KD20410611',
         )
         self.printing_order_other = printing_models.PrintingOrder.objects.create(
@@ -256,6 +258,8 @@ class PrintingJobByCustomerAPITest(TestCase):
         self.assertEqual(resp.data[0]['external_order_id'], 'KD20410611')
         self.assertEqual(resp.data[0]['sub_id'], 11)
         self.assertEqual(resp.data[0]['billed_quantity'], '20.00')
+        self.assertEqual(resp.data[0]['curve'], '曲线A')
+        self.assertEqual(resp.data[0]['new_curve'], '新曲线A')
 
     def test_filter_by_printing_order(self):
         resp = self._get({