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Mongo spring-data issue with java.util.Currency

由 亡梦爱人 提交于 2019-12-05 18:27:13

The Currency type is currently not supported out of the box by the Spring Data MongoDB object mapping system. You can teach Spring Data MongoDB how to convert instances of that type by providing a custom implementation of a core Spring Converter as described in the reference documentation.

public class CustomMongoConfiguration extends AbstractMongoConfiguration {

  @Bean
  @Override
  public CustomConversions customConversions() {

    Converter<Currency, String> currencyToString = source -> source.toString();
    Converter<String, Currency> stringToCurrency = source -> Currency.getInstance(source);

    return new CustomConversions(Arrays.asList(currencyToString, stringToCurrency));
  }
}

As the conversion to a String seems to be straight-forward, I create a ticket to be resolved in the upcoming version of Spring Data MongoDB.

Just in case someone else runs into @oliver-gierke's answer and get the NullPointerException like @kaluva

Spring's type resolver seems to have problems with the Lambda expression. Just change the bean definition to:

@Bean
public CustomConversions customConversions() {
    Converter<Currency, String> currencyToString = new Converter<Currency, String>() {
        @Override
        public String convert(Currency currency) {
            return currency.toString();
        }
    };

    Converter<String, Currency> stringToCurrency = new Converter<String, Currency>() {
        @Override
        public Currency convert(String s) {
            return Currency.getInstance(s);
        }
    };

    return new CustomConversions(Arrays.asList(currencyToString, stringToCurrency));
}

(I'm sorry I could not add this answer as comment to Oliver's answer. Stackoverflow won't let me.)

标签
java
Spring
jackson
spring-data
spring-data-mongodb
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