SpringBoot配置MongoDB去掉_class字段

最新推荐文章于 2025-06-10 14:07:22 发布

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最新推荐文章于 2025-06-10 14:07:22 发布

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分类专栏： 4.DB 文章标签： mongodb SpringBoot class

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本文介绍如何在使用Spring Data MongoDB时移除默认添加到集合中的_class键，适用于那些不需要处理继承关系且模型较为简单的场景。通过覆盖默认的MappingMongoConverter实现这一目的。

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When using spring data mongo it by default adds a _class key to your collection to be able to handle inheritance.
But if your domain model is simple and flat, you can remove it by overriding the default MappingMongoConverter

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.core.convert.*;
import org.springframework.data.mongodb.core.mapping.MongoMappingContext;

/**
 * @description:
 * When using spring data mongo it by default adds a _class key to your collection to be able to handle inheritance.
 * But if your domain model is simple and flat, you can remove it by overriding the default MappingMongoConverter
 * @author:@luomouren.
 * @Date:2017-12-03 21:26
 */
@Configuration
public class MongoConfig {

    @Bean
    public MappingMongoConverter mappingMongoConverter(MongoDbFactory factory, MongoMappingContext context, BeanFactory beanFactory) {
        DbRefResolver dbRefResolver = new DefaultDbRefResolver(factory);
        MappingMongoConverter mappingConverter = new MappingMongoConverter(dbRefResolver, context);
        try {
            mappingConverter.setCustomConversions(beanFactory.getBean(CustomConversions.class));
        } catch (NoSuchBeanDefinitionException ignore) {
        }

        // Don't save _class to mongo
        mappingConverter.setTypeMapper(new DefaultMongoTypeMapper(null));

        return mappingConverter;
    }

}