我正在使用graphql_flutter包在flutter中测试一个graphql查询。
下面是我执行查询的代码-

final phoneNumbers = ["4160000000", "7780000000"];

    final filters = phoneNumbers.map((phoneNumber) => phoneNumber).toList();

    Map<String, dynamic> filter = {
      "or": filters,
    };

    const String getAzureContacts = """
      query filterItems (\$filter: filters!) {
        items(filter: \$filter) {
          items {
            partitionKey
            userPhoneNumber
            userDisplayName
          } 
        }
      }
    """;

    HttpLink link = GlobalVariables().graphqlEndpoint;
    GraphQLClient graphQlClient = GraphQLClient(
      link: link,
      cache: GraphQLCache(
        store: InMemoryStore(),
      ),
    );
    try {
      QueryResult queryResult = await graphQlClient.query(
        QueryOptions(
            fetchPolicy: FetchPolicy.networkOnly,
            document: gql(
              getAzureContacts,
            ),
            variables: {'filter': filter}),
      );
      print(queryResult.data);
    } catch (e) {
      print('Query failed: $e');
    }

下面是运行代码后的错误-

I/flutter ( 7103): Query failed: Error on line 6, column 5: Expected a selection set starting with '{'
I/flutter ( 7103):   ╷
I/flutter ( 7103): 6 │     }
I/flutter ( 7103):   │     ^
I/flutter ( 7103):   ╵

更新-2023年4月22日
我已经添加了花括号，现在我得到另一个错误。

const String getAzureContacts = """ {
  query(\$filter: filters!) {
    items(filter: \$filter) {
      items {
        partitionKey
        userPhoneNumber
        userDisplayName
      }
    }
  }
}  
""";

I/flutter (11573): Query failed: Error on line 2, column 22: Expected an argument name
I/flutter (11573):   ╷
I/flutter (11573): 2 │   query filterItems ($filter: filters!) {
I/flutter (11573):   │                      ^
I/flutter (11573):   ╵