Spring Data REST自定义资源URI适用于String但不适用于Long

Question

我有一个模特:

public class MyModel {
    @Id private Long id;
    private Long externalId;
    // Getters, setters
}

我想externalId用作我的资源标识符:

@Configuration
static class RepositoryEntityLookupConfig extends RepositoryRestConfigurerAdapter {
    @Override
    public void configureRepositoryRestConfiguration(RepositoryRestConfiguration configuration) {
        configuration
                .withEntityLookup()
                    .forRepository(MyRepository.class, MyModel::getExternalId, MyRepository::findByExternalId);
    }
}

如果externalId是String,这可以正常工作.但因为它是一个数字(Long)

public interface MyRepository extends JpaRepository<MyModel, Long> {
    Optional<MyModel> findByExternalId(@Param("externalId") Long externalId);
}

在调用时:/myModels/1我得到:

java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Long
    at org.springframework.data.rest.core.config.EntityLookupConfiguration$RepositoriesEntityLookup.lookupEntity(EntityLookupConfiguration.java:213) ~[spring-data-rest-core-2.6.4.RELEASE.jar:na]
    at org.springframework.data.rest.core.support.UnwrappingRepositoryInvokerFactory$UnwrappingRepositoryInvoker.invokeFindOne(UnwrappingRepositoryInvokerFactory.java:130) ~[spring-data-rest-core-2.6.4.RELEASE.jar:na]
    at org.springframework.data.rest.webmvc.RepositoryEntityController.getItemResource(RepositoryEntityController.java:524) ~[spring-data-rest-webmvc-2.6.4.RELEASE.jar:na]
    at org.springframework.data.rest.webmvc.RepositoryEntityController.getItemResource(RepositoryEntityController.java:335) ~[spring-data-rest-webmvc-2.6.4.RELEASE.jar:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_111]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_111]
    ...

单独的自定义EntityLookupSupport<MyModel>组件类可以工作.

我是否遗漏了一些东西让Long我在我的工作中使用方法参考RepositoryRestConfigurerAdapter？

Answer 1

尝试将其添加到您的RepositoryEntityLookupConfig班级中：

@Override
public void configureConversionService(ConfigurableConversionService conversionService) {
    conversionService.addConverter(String.class, Long.class, Long::parseLong);
    super.configureConversionService(conversionService);
}