实现GraphQL&扑 [英] Implement GraphQL & Flutter

问题描述

是否可以在Flutter中实现GraphQL?我试图用JSON对象中的查询和变量对象进行API调用.

Is there a way to implement GraphQL in flutter? I was trying making the API call with the query and variables objects in a JSON object.

类型'_InternalLinkedHashMap'不是强制类型转换中'字符串'类型的子类型

type '_InternalLinkedHashMap' is not a subtype of type 'String' in type cast

推荐答案

我一直在使用 graphql_flutter 包已经有几个星期了，它似乎已经足够好了.这是一个示例:

I have been using graphql_flutter package for a few weeks now and it seems to work well enough. Here is an example:

import 'package:graphql_flutter/graphql_flutter.dart' show Client, InMemoryCache;
...
Future<dynamic> post(
    String body, {
    Map<String, dynamic> variables,
  }) async {
    final Client client = Client(
      endPoint: endpoint,
      cache: new InMemoryCache(),
    );

    final Future<Map<String, dynamic>> result =
        client.query(query: body, variables: variables);

    return result;
  }

要使用它，只需给它graphql和任何变量.即删除突变可能看起来像

To use just give it the graphql and any variables. i.e. a delete mutation may look like

String deleteMutation =
      '''mutation deleteItem(\$itemId: ID!) {
    deleteItem(input: { itemId: \$itemId}) {
      itemId
    }
  }'''.replaceAll('\n', ' ');

 await post(deleteMutation , variables: <String, dynamic>{'itemId': itemId});

这篇关于实现GraphQL&扑的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！