Flutter 渡輪自定義標量序列化器“具有非動態類型”

Question

我在 flutter 渡輪 graphql package 中的自定義序列化程序有點問題：

我完全使用了渡輪文檔中的示例： https://ferrygraphql.com/docs/custom-scalars/#create-a-custom-serializer

但是在運行 builder_runner 時我總是收到以下消息：

[SEVERE] built_value_generator:built_value on lib/schema.schema.gql.dart:
Error in BuiltValueGenerator for abstract class GDailyForecastInput implements Built<GDailyForecastInput, dynamic>.
Please make the following changes to use BuiltValue:

1. Make field dateStart have non-dynamic type. If you are already specifying a type, please make sure the type is correctly imported.
2. Make field dateEnd have non-dynamic type. If you are already specifying a type, please make sure the type is correctly imported.
[SEVERE] built_value_generator:built_value on lib/schema.schema.gql.dart:
Error in BuiltValueGenerator for abstract class GHourlyForecastInput implements Built<GHourlyForecastInput, dynamic>.
Please make the following changes to use BuiltValue:

1. Make field dateStart have non-dynamic type. If you are already specifying a type, please make sure the type is correctly imported.
2. Make field dateEnd have non-dynamic type. If you are already specifying a type, please make sure the type is correctly imported.

dateStart 和 dateEnd 是 Date 類型的查詢輸入值 這是我的類型覆蓋：type_overrides: Date: name: Date 有人知道為什么會發生這個錯誤嗎？ 我真的找不到問題所在

日期在我的 schema.graphql 文件中定義為標量：

"""A date string with format `Y-m-d`, e.g. `2011-05-23`."""
scalar Date

這是我的 build.yaml 文件：

targets:
  $default:
    builders:
      gql_build|schema_builder:
        enabled: true
        options:
          type_overrides:
            Date:
              name: Date
              
      gql_build|ast_builder:
        enabled: true
        options:
          type_overrides:
            Date:
              name: Date

      gql_build|data_builder:
        enabled: true
        options:
          type_overrides:
            Date:
              name: Date
          schema: appdemo|lib/schema.graphql

      gql_build|var_builder:
        enabled: true
        options:
          type_overrides:
            Date:
              name: Date
          schema: appdemo|lib/schema.graphql

      gql_build|serializer_builder:
        enabled: true
        options:
          schema: appdemo|lib/schema.graphql
          custom_serializers:
            - import: './serializers/date_serializer.dart'
              name: DateSerializer

      ferry_generator|req_builder:
        enabled: true
        options:
          type_overrides:
            Date:
              name: Date
          schema: appdemo|lib/schema.graphql

我已經試過調試了。 如果我將標量重命名為DateTime ，一切正常。 （我的schema.graphql文件中也有一個標量DateTime 。）只有當我使用名稱Date時才會出現此錯誤。

我錯過了什么嗎？ 我是否需要在文檔中的代碼之外創建一個 dart Date class 並鏈接它？

Answer 1

確保還包括 data_builder、var_builder 和 req_builder 的 type_overrides。

重要為了簡潔起見，我們只包含上面的 schema_builder，但我們還需要為 data_builder、var_builder 和 req_builder 包含相同的 type_overrides map。 有關詳細信息，請參閱完整的 build.yaml 示例。

例如：

假設我有兩個自定義標量，一個原始類型和一個非原始類型，

schema.graphql ：

scalar Date #A datetime string in iso8601.
scalar Metadata #A map with key string and value any.

type Test {
  id: ID!
  date: Date!
  metadata: Metadata!
}

type Query {
  getTest(): Test!
}

date_serializer.dart ：

import 'package:built_value/serializer.dart';

class DateSerializer implements PrimitiveSerializer<DateTime> {
  @override
  DateTime deserialize(
    Serializers serializers,
    Object serialized, {
    FullType specifiedType = FullType.unspecified,
  }) {
    assert(serialized is String,
        "DateSerializer expected 'String' but got ${serialized.runtimeType}");
    return DateTime.parse(serialized is String ? serialized : "");
  }

  @override
  Object serialize(
    Serializers serializers,
    DateTime date, {
    FullType specifiedType = FullType.unspecified,
  }) =>
      date.toUtc().toIso8601String();

  @override
  Iterable<Type> get types => [DateTime];

  @override
  String get wireName => "Date";
}

metadata_serializer.dart ：

import "package:gql_code_builder/src/serializers/json_serializer.dart";

class MetadataSerializer extends JsonSerializer<Map<String, dynamic>> {
  @override
  Map<String, dynamic> fromJson(Map<String, dynamic> json) => json;

  @override
  Map<String, dynamic> toJson(Map<String, dynamic> map) => map;
}

build.yaml ：

targets:
  $default:
    builders:
      gql_build|schema_builder:
        enabled: true
        options:
          type_overrides:
            Metadata:
              name: Map<String, dynamic>
            Date:
              name: DateTime
      gql_build|ast_builder:
        enabled: true

      gql_build|data_builder:
        enabled: true
        options:
          schema: my_project|lib/schema.graphql
          type_overrides:
            Metadata:
              name: Map<String, dynamic>
            Date:
              name: DateTime
      gql_build|var_builder:
        enabled: true
        options:
          schema: my_project|lib/schema.graphql
          type_overrides:
            Metadata:
              name: Map<String, dynamic>
            Date:
              name: DateTime
      gql_build|serializer_builder:
        enabled: true
        options:
          schema: my_project|lib/schema.graphql
          custom_serializers:
            - import: 'path/to/metadata_serializer.dart'
              name: MetadataSerializer
            - import: 'path/to/date_serializer.dart'
              name: DateSerializer

      ferry_generator|req_builder:
        enabled: true
        options:
          schema: my_project|lib/schema.graphql
          type_overrides:
            Metadata:
              name: Map<String, dynamic>
            Date:
              name: DateTime

構建后，您現在應該覆蓋兩個標量，

test.dart ：

client.request(request).first.then((response){
  print(response.data?.test.date.runtimeType);
  print(response.data?.test.metadata.runtimeType);
})

output :

DateTime
JsLinkedHashMap<String, dynamic>