Spring Mongo：使用Spring Boot和Mongodb（MongoRepository）的自定义转换器不起作用。我无法删除_class字段

Question

我正在尝试为Spring Data Mongo实现一个@WritingConverter，但似乎什么也没做。

我尝试了以下这篇文章：https://www.baeldung.com/spring-data-mongodb-index-annotations-converter。

还尝试在其他StackOverflow线程中找到答案：

Spring not using mongo custom converters;

Spring data MongoDb: MappingMongoConverter remove _class;

Spring Mongodb - Cannot write custom Converter for java.time.Period;

Setup custom converters in Spring Data Mongo;

我使用的是MongoRepository（例如JPARepository），而不是mongoTemplate来获取查询结果。

这是我要转换的班级：

 

    @Document(collection = "users")
    @Getter
    @Setter
    public class User {
        @Id
        private int id;
        private String username;
        private String password;
        private String role;
        private PersonalData personalData;

        public User() {

        }

        @PersistenceConstructor
        public User(String username, String password, String role, PersonalData personalData) {
            this.username = username;
            this.password = password;
            this.role = role;
            this.personalData = personalData;
        }
    }

 

这是MongoConfig类：

 

    @Configuration
    @EnableMongoRepositories(basePackages = {"edu.utcn.carappapi.repositories"})
    public class MongoConfig extends AbstractMongoConfiguration {

        private List<Converter<?, ?>> converters = new ArrayList<Converter<?, ?>>();

        @Override
        protected String getDatabaseName() {
            return "rentcar";
        }

        @Override
        public MongoClient mongoClient() {
            return new MongoClient("127.0.0.1", 27017);
        }

    //    @Override
    //    public MappingMongoConverter mappingMongoConverter() throws Exception {
    //        DbRefResolver dbRefResolver = new DefaultDbRefResolver(this.mongoDbFactory());
    //        MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, this.mongoMappingContext());
    //        converter.setCustomConversions(this.customConversions());
    //        converter.afterPropertiesSet();
    //        return converter;
    //    }

        @Override
        public MongoCustomConversions customConversions() {
            converters.add(new UserWriterConverter());
            return new MongoCustomConversions(converters);
        }
    }

 

这是WritingConverter：

 

    @Component
    @WritingConverter
    public class UserWriterConverter implements Converter<User, DBObject> {

        @Override
        public DBObject convert(User user) {
            DBObject dbObject = new BasicDBObject();
            dbObject.put("id", user.getId());
            dbObject.put("username", "dummy");
            dbObject.put("password", user.getPassword());
            dbObject.put("role", user.getRole());
            if (user.getPersonalData() != null) {
                DBObject personalDataDbObject = new BasicDBObject();
                personalDataDbObject.put("email", user.getPersonalData().getEmail());
                personalDataDbObject.put("firstName", user.getPersonalData().getFirstName());
                personalDataDbObject.put("lastName", user.getPersonalData().getLastName());
                personalDataDbObject.put("phoneNumber", user.getPersonalData().getPhoneNumber());
                personalDataDbObject.put("age", user.getPersonalData().getAge());
                dbObject.put("personalData", personalDataDbObject);
            }
            dbObject.removeField("_class");
            return dbObject;
        }
    }

 

文档中不应包含_class字段。

 

    {
     ...
     "_class" : "edu.utcn.carappapi.entities.User"
    }