spring-jpa-mongodb 不保存"_class"字段

package com.erick.infrastructure.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.MongoDatabaseFactory;
import org.springframework.data.mongodb.core.convert.DbRefResolver;
import org.springframework.data.mongodb.core.convert.DefaultDbRefResolver;
import org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper;
import org.springframework.data.mongodb.core.convert.MappingMongoConverter;
import org.springframework.data.mongodb.core.mapping.MongoMappingContext;

@Configuration
public class MongoConfig {

    private final MongoDatabaseFactory mongoDbFactory;
    private final MongoMappingContext mongoMappingContext;

    public MongoConfig(MongoDatabaseFactory mongoDbFactory, MongoMappingContext mongoMappingContext) {
        this.mongoDbFactory = mongoDbFactory;
        this.mongoMappingContext = mongoMappingContext;
    }

    /**
     * 转换类配置
     * @return 转换类
     */
    @Bean
    public MappingMongoConverter mappingMongoConverter() {
        DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDbFactory);
        MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, mongoMappingContext);
        //不保存 _class 属性到 mongo
        converter.setTypeMapper(new DefaultMongoTypeMapper(null));
        return converter;
    }
}