Graphql 没有为接口/联合定义解析器 - java [英] Graphql no resolver definied for interface/union - java

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问题描述

我在 graphql 中使用这种方法添加解析器时遇到问题:

@RestController@RequestMapping("/api/dictionary/")@RequiredArgsConstructor(onConstructor = @__(@Autowired))公共类字典控制器{@Value("classpath:items.graphqls")私有资源架构资源；私有 GraphQL graphQL；私人最终字典服务字典服务；@PostConstructpublic void loadSchema() 抛出 IOException {文件 schemaFile = schemaResource.getFile();TypeDefinitionRegistry registry = new SchemaParser().parse(schemaFile);RuntimeWiring 接线 = buildWiring();GraphQLSchema schema = new SchemaGenerator().makeExecutableSchema(registry,wiring);graphQL = GraphQL.newGraphQL(schema).build();}私有 RuntimeWiring buildWiring() {DataFetcher<List<DictionaryItemWithParentDto>>fetcher6 = dataFetchingEnvironment ->dictionaryService.getClaimSubType();返回 RuntimeWiring.newRuntimeWiring().type("查询", typeWriting ->打字.dataFetcher("getClaimSubType", fetcher6)).建造();}公共列表getClaimSubType() {返回 dictionaryService.getClaimSubType();}}

items.graphqls 文件内容:

类型查询{getClaimSubType: [DictionaryItemWithParentDto]}输入 DictionaryItemWithParentDto {代码:字符串！名称:字符串父母:[DictionaryItemDto]}输入 DictionaryItemDto {代码:字符串！名称:字符串描述:字符串}

在 Java 中，我有 Vehicle 接口和两个实现它的类:Airplane 和 Car.当我将此行添加到架构时:

union SearchResult = 飞机 |车

我收到以下错误:

没有为 interface/union 'Vehicle' 类型定义类型解析器，没有为 interface/union 'SearchResult' 类型定义类型解析器]}

我不知道如何处理.

如果我添加:

interface Vehicle {最大速度:整数}类型飞机执行车辆{最大速度:整数翼展:Int}类型 Car 执行 Vehicle {最大速度:整数牌照:字符串}

我收到以下错误:

errors=[没有为接口/联合车辆"类型定义类型解析器]

如何使用我的方法处理这些错误?有没有其他方法来处理它?<​​/p>

编辑

添加这些代码行我猜可以解决这个问题:

TypeResolver t = new TypeResolver() {@覆盖公共 GraphQLObjectType getType(TypeResolutionEnvironment env) {对象 javaObject = env.getObject();if (javaObject instanceof Car) {返回 env.getSchema().getObjectType("Car");} else if (javaObject instanceof Airplane) {返回 env.getSchema().getObjectType("飞机");} 别的 {返回 env.getSchema().getObjectType("Car");}}};

并添加到 RuntimeWiring 构建器:

 .type("Vehicle", typeWriting ->打字.typeResolver(t))@PostMapping("getVehicle")公共响应实体<对象>getVehicleMaxSpeed(@RequestBody String 查询){ExecutionResult 结果 = graphQL.execute(query);返回新的 ResponseEntity(结果，HttpStatus.OK)；}
要求时:
查询{getVehicle(最大速度:30){最大速度}}
我得到了 maxSpeed 但是当我添加 wingspan 时我得到一个错误 
'Vehicle' 类型中的字段 'wingspan' 未定义 @'getVehicle/wingspan'",
我加了
getVehicle(maxSpeed: Int):车辆
到 graphqls 文件.我认为多态在这里会起作用.
 解决方案 
添加以下代码行解决问题:
TypeResolver t = new TypeResolver() {@覆盖公共 GraphQLObjectType getType(TypeResolutionEnvironment env) {对象 javaObject = env.getObject();if (javaObject instanceof Car) {返回 env.getSchema().getObjectType("Car");} else if (javaObject instanceof Airplane) {返回 env.getSchema().getObjectType("飞机");} 别的 {返回 env.getSchema().getObjectType("Car");}}};
并添加到 RuntimeWiring 构建器:
 .type("Vehicle", typeWriting ->打字.typeResolver(t))@PostMapping("getVehicle")公共响应实体<对象>getVehicleMaxSpeed(@RequestBody String 查询){ExecutionResult 结果 = graphQL.execute(query);返回新的 ResponseEntity(结果，HttpStatus.OK)；}
要求时:
查询{getVehicle(最大速度:30){最大速度}}
我得到了 maxSpeed 但是当我添加 wingspan 时我得到一个错误 
'Vehicle' 类型中的字段 'wingspan' 未定义 @'getVehicle/wingspan'",
我加了
getVehicle(maxSpeed: Int):车辆
到 graphqls 文件.我认为多态在这里会起作用.
如果我想要子类的字段，我可以这样要求:
查询{getVehicle(最大速度:10){最大速度...在飞机上{翼展}...在车上{牌照}}}
I have problem adding resolver using this approach in graphql:
@RestController
@RequestMapping("/api/dictionary/")
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
public class DictionaryController {
    @Value("classpath:items.graphqls")
    private Resource schemaResource;
    private GraphQL graphQL;
    private final DictionaryService dictionaryService;

    @PostConstruct
    public void loadSchema() throws IOException {
        File schemaFile = schemaResource.getFile();
        TypeDefinitionRegistry registry = new SchemaParser().parse(schemaFile);
        RuntimeWiring wiring = buildWiring();
        GraphQLSchema schema = new SchemaGenerator().makeExecutableSchema(registry, wiring);
        graphQL = GraphQL.newGraphQL(schema).build();
    }

private RuntimeWiring buildWiring() {
    DataFetcher<List<DictionaryItemWithParentDto>> fetcher6 = dataFetchingEnvironment -> dictionaryService.getClaimSubType();

        return RuntimeWiring.newRuntimeWiring()
                .type("Query", typeWriting ->
                   typeWriting
                    .dataFetcher("getClaimSubType", fetcher6)
                    )
                .build();
    }


public List<DictionaryItemWithParentDto> getClaimSubType() {
    return dictionaryService.getClaimSubType();
   }
  }

items.graphqls file content:
type Query {
    getClaimSubType: [DictionaryItemWithParentDto]
}

type DictionaryItemWithParentDto {
    code: String!
    name: String
    parents: [DictionaryItemDto]
}

type DictionaryItemDto {
    code: String!
    name: String
    description: String
}

In java I have Vehicle interface and two classes that implement it: Airplane and Car. When i add to schema this line:
union SearchResult = Airplane | Car

I get following error:
There is no type resolver defined for interface / union 'Vehicle' type, There is no type resolver defined for interface / union 'SearchResult' type]}

I am not sure how to handle it.



If instead i add:
interface Vehicle {
    maxSpeed: Int
}

type Airplane implements Vehicle {
    maxSpeed: Int
    wingspan: Int
}

type Car implements Vehicle {
    maxSpeed: Int
    licensePlate: String
}

I get following error:
errors=[There is no type resolver defined for interface / union 'Vehicle' type]

How can i handle these errors using my approach ? Is there another approach to handle it?



Edit



Adding these lines of code fix the issue partway i guess:
TypeResolver t =  new TypeResolver() {
    @Override
    public GraphQLObjectType getType(TypeResolutionEnvironment env) {
        Object javaObject = env.getObject();
        if (javaObject instanceof Car) {
            return env.getSchema().getObjectType("Car");
        } else if (javaObject instanceof Airplane) {
            return env.getSchema().getObjectType("Airplane");
        } else {
            return env.getSchema().getObjectType("Car");
        }
    }
};

And adding to RuntimeWiring builder this:
            .type("Vehicle", typeWriting ->
                    typeWriting
                            .typeResolver(t)
            )


    @PostMapping("getVehicle")
    public ResponseEntity<Object> getVehicleMaxSpeed(@RequestBody String query) 
   {
        ExecutionResult result = graphQL.execute(query);
        return new ResponseEntity<Object>(result, HttpStatus.OK);
    }

When asking for:
query {
    getVehicle(maxSpeed: 30) {
        maxSpeed

    }
}

I get the maxSpeed but when i add wingspan i get an error 
Field 'wingspan' in type 'Vehicle' is undefined @ 'getVehicle/wingspan'",

I added 
getVehicle(maxSpeed: Int): Vehicle

To the graphqls file. I thought that polymorphism would work here.
 解决方案 
Adding these lines of code fix the issue:
TypeResolver t =  new TypeResolver() {
    @Override
    public GraphQLObjectType getType(TypeResolutionEnvironment env) {
        Object javaObject = env.getObject();
        if (javaObject instanceof Car) {
            return env.getSchema().getObjectType("Car");
        } else if (javaObject instanceof Airplane) {
            return env.getSchema().getObjectType("Airplane");
        } else {
            return env.getSchema().getObjectType("Car");
        }
    }
};

And adding to RuntimeWiring builder this:
            .type("Vehicle", typeWriting ->
                    typeWriting
                            .typeResolver(t)
            )


    @PostMapping("getVehicle")
    public ResponseEntity<Object> getVehicleMaxSpeed(@RequestBody String query) 
   {
        ExecutionResult result = graphQL.execute(query);
        return new ResponseEntity<Object>(result, HttpStatus.OK);
    }

When asking for:
query {
    getVehicle(maxSpeed: 30) {
        maxSpeed

    }
}

I get the maxSpeed but when i add wingspan i get an error 
Field 'wingspan' in type 'Vehicle' is undefined @ 'getVehicle/wingspan'",

I added 
getVehicle(maxSpeed: Int): Vehicle

To the graphqls file. I thought that polymorphism would work here.



If i want fields from subclasses i can ask for them like that:
query {
    getVehicle(maxSpeed: 10) {
        maxSpeed
        ... on Airplane {
        wingspan
      }
        ... on Car {
        licensePlate
      }
    }
}



                        
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