JSON data types cannot be deserialized from a GraphQL query by using Ferry package

Question

I have this GraphQL query:

query QuoteRequests($page: Int!) {
  getQuoteRequestsList(page: $page) {
    vehicle
    body
    licensePlate
    vin
    quality
    currency
    items
  }
}

It generates this sample result:

{
    "data": {
        "getQuoteRequestsList": [
            {
                "vehicle": "1997 TOYOTA AVALON 4 DR ",
                "body": "Sedan",
                "licensePlate": "RHJ456",
                "vin": "XBGGDFYYREAXVJJJD",
                "quality": [
                    "GENUINO"
                ],
                "currency": "USD",
                "items": [
                    {
                        "uid": "74355f85-5312-9999-8acd-709ceccda00a",
                        "name": "Doble cero que es",
                        "description": "no me interesa",
                        "quantity": 11
                    },
                    {
                        "uid": "66db6fe0-1044-4d58-8454-5e51ab7a313f",
                        "name": "El arenero",
                        "description": "el duende verde",
                        "quantity": 2
                    }
                ]
            },
        ]
    }
}

The items data is a JSON type, and when trying to fetch that data by using Ferry package with

client.request(GQuoteRequestsReq((b) => b..vars.page = 0)).listen((response) => print(response.data.toString()));

I get a Null result, but if I leave items out of the query, I get a no-null result. I have no problem if I run that query using the HTTP package.

Is this is an error from Package? or do I need to configure something?

Thanks.

UPDATE 1

This is definitely an error because if I try to make a hot-reload in Flutter I get this error in debug console:

Reloaded 1 of 1700 libraries in 860ms.
E/flutter ( 2286): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Deserializing '[__typename, Query, getQuoteRequestsList, [{__typename: GetQuoteRequestsRecor...' to 'GQuoteRequestsData' failed due to: Deserializing '[{__typename: GetQuoteRequestsRecord, uid: 0bf6709f-7ab7-464e-8ee3-6a94e46f05...' to 'BuiltList<GQuoteRequestsData_getQuoteRequestsList>' failed due to: Deserializing '[__typename, GetQuoteRequestsRecord, uid, 0bf6709f-7ab7-464e-8ee3-6a94e46f057...' to 'GQuoteRequestsData_getQuoteRequestsList' failed due to: Deserializing '[{uid: 16870250-5acb-4c23-a7e4-f4e23bbd23ad, name: Doble cero que es, descrip...' to 'GJSON' failed due to: type 'List<dynamic>' is not a subtype of type 'String?' in type cast
E/flutter ( 2286): #0      BuiltJsonSerializers._deserialize
package:built_value/src/built_json_serializers.dart:178
E/flutter ( 2286): #1      BuiltJsonSerializers.deserialize
package:built_value/src/built_json_serializers.dart:124

It's clear it is fetching the expected result but it cannot deserialize properly, then it returns a null result.

Is there any workaround?

UPDATE 2

I've tried this solution but I'm getting same error.

In my case, I've followed these steps, I've

• installed built_value package,
• edited build.yaml file,
• run the command flutter packages pub run build_runner build

Answer 1

The answer can be found in this issue.