用于枚举字段的mongoDb和spring数据自定义转换器

Question

我有一个名为Metric的简单Java类，它有两个字段：MetricType和value：

public class Metric {
    MetricType type;
    int value;
}

enum MetricType {
    SPACE, CPU, UNKNOWN
}

public interface MetricRepository extends MongoRepository<Metric, 
String> {}

@ReadingConverter
public class StringToMetricTypeConverter implements Converter<String, MetricType> {

    @Override
    public MetricType convert(String dbData) {
         try {
             return MetricType.valueOf(dbData);
         }
        catch (IllegalArgumentException e) {
            return MetricType.UNKNOWN;
        }
     }
 }

@Bean
public MongoTemplate mongoTemplate() throws Exception {
    MongoTemplate mongoTemplate = new MongoTemplate(mongo(), getDatabaseName());
    MappingMongoConverter mongoMapping = (MappingMongoConverter) mongoTemplate.getConverter();
    mongoMapping.setCustomConversions(customConversions()); 
    mongoMapping.afterPropertiesSet();
    return mongoTemplate;
}

@Bean
public CustomConversions customConversions() {
    return new CustomConversions(Arrays.asList(new StringToMetricTypeConverter()));
}

Answer 1

您可以尝试使用MongoCustomConversions而不是org.springframework.data.convert.CustomConversions。MongoCustomConversions是CustomConversions

但是理想的情况是根本不需要任何转换，或者转换器可以在枚举中配置。