类型FieldUndefined的验证错误:类型'Query‘中的字段'register’未定义

Question

我是GrapQL的新手。我正试着把它和弹力靴一起使用。我可以成功地进行查询，它返回了我需要的数据，但我想现在使用突变。当他注册时，我需要向数据库添加一个用途。

这是我的schema.graphqls文件：

type Token {
    token: String
}
type Register {
    message: String
}
type User {
    username: String!
    firstName: String!
    lastName: String!
    password: String!
    role: String!
}

type Query {
    login(username: String, password: String): Token
}

type Mutation {
    register(input: RegisterUserInput!): Register
}

input RegisterUserInput {
    username: String!
    firstName: String!
    lastName: String!
    password: String!
    role: String!
}

schema {
    query: Query
    mutation: Mutation
}

因此，正如您所看到的，寄存器是突变类型，它是按查询方式添加到模式中的。但由于某些原因，它看起来不会发生突变，它只是试图在查询中找到类型。

这是我的控制器：

@Autowired
    private UserService userService;

    /**
     * Login the user and return generated token
     * @param query
     * @return String token
     */
    @PostMapping("/login")
    public ResponseEntity<Object> login(@RequestBody String query){
        ExecutionResult executionResult = userService.getGraphQL().execute(query);

        // Check if there are errors
        if(!executionResult.getErrors().isEmpty()){
            return new ResponseEntity<>(executionResult.getErrors().get(0).getMessage(), HttpStatus.UNAUTHORIZED);
        }

        return new ResponseEntity<>(executionResult, HttpStatus.OK);
    }

    /**
 * Create new user and save him to database
 * @param mutation
 * @return String message
 */
@PostMapping("/register")
public ResponseEntity<Object> register(@RequestBody String mutation){
    ExecutionResult executionResult = userService.getGraphQL().execute(mutation);

    // Check if there are errors
    if(!executionResult.getErrors().isEmpty()){
        return new ResponseEntity<>(executionResult.getErrors().get(0).getMessage(), HttpStatus.UNAUTHORIZED);
    }

    return new ResponseEntity<>(executionResult, HttpStatus.OK);
}

正如我所说的，登录工作正常，但注册返回了我在标题中提到的错误。

我的服务类：

@Value("classpath:graphql-schema/schema.graphqls")
    Resource resource;

    private GraphQL graphQL;

    @Autowired
    private LoginDataFetcher loginDataFetcher;
    @Autowired
    private RegisterDataFetcher registerDataFetcher;

    @PostConstruct
    public void  loadSchema() throws IOException{
    // Get the schema
    File schemaFile = resource.getFile();

    // Parse schema
    TypeDefinitionRegistry typeDefinitionRegistry = new SchemaParser().parse(schemaFile);
    RuntimeWiring runtimeWiring = buildRuntimeWiring();
    GraphQLSchema graphQLSchema = new SchemaGenerator().makeExecutableSchema(typeDefinitionRegistry, runtimeWiring);
    graphQL = GraphQL.newGraphQL(graphQLSchema).build();
}

private RuntimeWiring buildRuntimeWiring() {
    return RuntimeWiring.newRuntimeWiring()
            .type("Query", typeWiring ->
                typeWiring
                    .dataFetcher("login", loginDataFetcher))
            .type("Mutation", typeWiring ->
                typeWiring
                    .dataFetcher("register", registerDataFetcher))
            .build();
}

public GraphQL getGraphQL() {
    return graphQL;
}

我的LoginDataFetcher：

@Autowired
    private AppUserRepository appUserRepository;

    private JwtGenerator jwtGenerator;

    public LoginDataFetcher(JwtGenerator jwtGenerator) {
        this.jwtGenerator = jwtGenerator;
    }

    @Override
    public TokenDAO get(DataFetchingEnvironment dataFetchingEnvironment) {
        String username = dataFetchingEnvironment.getArgument("username");
        String password = dataFetchingEnvironment.getArgument("password");

        AppUser appUser = appUserRepository.findByUsername(username);

        // If user is not foung
        if(appUser == null){
            throw new RuntimeException("Username does not exist");
        }

        // If the user is fount check passwords
        if(!appUser.getPassword().equals(password)){
            throw new RuntimeException("Incorrect password");
        }

        // Generate the token
        String token = jwtGenerator.generate(appUser);

        return new TokenDAO(token);
    }

RegisterDataFetcher：

@Autowired
    private AppUserRepository appUserRepository;

    @Override
    public RegisterDAO get(DataFetchingEnvironment dataFetchingEnvironment) {
        String username = dataFetchingEnvironment.getArgument("username");
        String firstName = dataFetchingEnvironment.getArgument("firstName");
        String lastName = dataFetchingEnvironment.getArgument("lastName");
        String password = dataFetchingEnvironment.getArgument("password");
        String role = dataFetchingEnvironment.getArgument("role");

        AppUser appUser = appUserRepository.findByUsername(username);

        // Check if username exists
        if(appUser != null){
            throw new RuntimeException("Username already taken");
        }

        AppUser newAppUser = new AppUser(username, password, role, firstName, lastName);

        // Save new user
        appUserRepository.save(newAppUser);

        return new RegisterDAO("You have successfully registered");
    }

我在控制台中看到的错误：

graphql.GraphQL                          : Query failed to validate : '{
    register(username: "user", firstName: "Bla", lastName: "Blabla", password: "password", role: "DEVELOPER") {
        message
    }
}'

谢谢你的帮助。

更新

根据我得到的答案，我像这样修改了我的模式文件：

query UserQuery{
    login(username: String, password: String){
        token
    }
}

mutation UserMutation{
    register(input: RegisterUserInput) {
        message
    }
}

input RegisterUserInput {
    username: String!
    firstName: String!
    lastName: String!
    password: String!
    role: String!
}

schema {
    query: UserQuery
    mutation: UserMutation
}

但是现在我得到了这个错误：

解析类型“”query“”时不存在操作类型“”UserQuery“”。解析类型“”query“”时不存在操作类型“”UserMutation“

那么现在的问题是什么呢？我怎么才能让它工作呢？

Answer 1

您告诉GraphQL您正在请求一个查询，而实际上register是一个突变。编写GraphQL请求时，查询语法通常遵循以下格式：

query someOperationName {
  login {
    # other fields
  }
}

在编写突变时，您只需简单地指定：

mutation someOperationName {
  register {
    # other fields
  }
}

您可以省略操作名称，但最好将其包括在内。您可能会看到以下格式的示例：

{
  someQuery {
    # other fields
  }
}

在这种情况下，操作名称和操作类型(查询与突变)都被省略了。这仍然是一个有效的请求，因为当您去掉操作类型时，GraphQL只是假设您指的是query。从规范中：

如果文档只包含一个操作，则该操作可以是未命名的，也可以用速记形式表示，这将省略查询关键字和操作名称。

因此，在您的请求中，GraphQL假设register是一个查询，而实际上它是一个突变，并返回一个错误作为结果。

同样，在编写请求时，最好始终同时包含操作名称和查询/突变关键字。