Setup custom converters in Spring Data Mongo

问题

We are trying to setup our own Converters for Spring Data Mongo and having problems with it.

Seems like Spring never calls for registerConvertersIn on CustomConversions and thus our custom converters added through overriden AbstractMongoConfiguration#customConversions never become part of conversion.

We are using Spring Data Mongo 1.6.3, but it seems it could be a problem for 1.8.0 too (I've checked calls to CustomConversions#registerConvertersIn and found none.)

I was able to fix this problem by calling CustomConversions#registerConvertersIn in custom MappingMongoConverter like this:

class MongoConfig extends AbstractMongoConfiguration {
    @Bean
    @Override
    public MappingMongoConverter mappingMongoConverter() throws Exception {
        DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDbFactory());
        MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, mongoMappingContext()) {
            @Override
            public void setCustomConversions(CustomConversions conversions) {
                super.setCustomConversions(conversions);
                conversions.registerConvertersIn(conversionService);
            }

        };
        converter.setCustomConversions(customConversions());
        return converter;
    }
}

Is that a bug or we are doing something wrong?

Found another work around: https://stackoverflow.com/a/14369998/4567261

回答1:

Did you annotate your MongoConfig class with @Configuration ?

Your class MongoConfig need to be managed by the Spring BeanFactory to get callback afterPropertiesSet()( where conversions.registerConvertersIn(conversionService) is originally called ) automatically called

If you don't annotate you configuration bean you need to call afterPropertiesSet() yourself

回答2:

Nothing worked for me but this.While setting up mongo template we need to tell to mongo db use the custom conversion.

@Bean
public MongoTemplate mongoTemplate() throws Exception {

    MongoTemplate mongoTemplate = new MongoTemplate(mongo(), mongoDatabase);
    MappingMongoConverter mongoMapping = (MappingMongoConverter) mongoTemplate.getConverter();
    mongoMapping.setCustomConversions(customConversions()); // tell mongodb to use the custom converters
    mongoMapping.afterPropertiesSet();
    return mongoTemplate;

}

Follow this link for more details : http://ufasoli.blogspot.in/2017/06/custom-converter-for-mongodb-and-spring.html

来源：https://stackoverflow.com/questions/34212545/setup-custom-converters-in-spring-data-mongo