Meetup
实体
Map<String,String> properties
field
MEETUP_PROPERTY
表作为 @ElementCollection
MeetupRepository
QueryDslPredicateExecutor<Meetup>
网络查询
GET /api/meetup?properties[aKey]=aValue
仅返回具有指定键和值的属性条目的 Meetup:aKey=aValue。
但是,这对我不起作用。 我错过了什么?
使用简单的字段,例如名称和描述:
GET /api/meetup?name=whatever
收集字段像参与者一样工作:
GET /api/meetup?participants.name=whatever
但不是这个 Map 字段。
我尝试通过拥有存储库来自定义绑定(bind)
extend QuerydslBinderCustomizer<QMeetup>
并覆盖
customize(QuerydslBindings bindings, QMeetup meetup)
方法,但是 customize()
方法被命中,lambda 内部的绑定(bind)代码没有。
编辑:得知这是因为 QuerydslBindings
评估查询参数的方法不要让它与 pathSpecs
匹配映射它在内部持有 - 其中包含您的自定义绑定(bind)。
@ElementCollection(fetch = FetchType.EAGER)
@CollectionTable(name = "MEETUP_PROPERTY", joinColumns = @JoinColumn(name = "MEETUP_ID"))
@MapKeyColumn(name = "KEY")
@Column(name = "VALUE", length = 2048)
private Map<String, String> properties = new HashMap<>();
编辑:见上文;事实证明,这对我的代码没有任何作用。
public interface MeetupRepository extends PagingAndSortingRepository<Meetup, Long>,
QueryDslPredicateExecutor<Meetup>,
QuerydslBinderCustomizer<QMeetup> {
@Override
default void customize(QuerydslBindings bindings, QMeetup meetup) {
bindings.bind(meetup.properties).first((path, value) -> {
BooleanBuilder builder = new BooleanBuilder();
for (String key : value.keySet()) {
builder.and(path.containsKey(key).and(path.get(key).eq(value.get(key))));
}
return builder;
});
}
QuerydslPredicateBuilder.getPredicate()
问 QuerydslBindings.getPropertyPath()
尝试 2 种方法来返回路径,以便它可以做出 QuerydslAwareRootResourceInformationHandlerMethodArgumentResolver.postProcess()
的谓词可以使用。
QuerydslPredicateBuilder.getPredicate()
自动创建谓词。
很好 - 我可以手动完成,如果我可以连接到 QuerydslAwareRootResourceInformationHandlerMethodArgumentResolver.postProcess()
如何覆盖该类或替换 bean?它被实例化并作为 RepositoryRestMvcConfiguration.repoRequestArgumentResolver()
中的 bean 返回bean 声明。
repoRequestArgumentResolver
来覆盖该 bean bean,但它不会被使用。
RepositoryRestMvcConfiguration
覆盖s。我不能通过设置它来强制它@Primary
或 @Ordered(HIGHEST_PRECEDENCE)
. RepositoryRestMvcConfiguration.class
来强制它,但这也会弄乱 Spring Boot 的自动配置,因为它会导致
RepositoryRestMvcConfiguration's
要处理的 bean 声明
在任何自动配置运行之前。除其他外,这会导致 Jackson 以不需要的方式序列化响应。嗯 - 看起来我期望的支持不存在。
所以问题变成了:
如何正确覆盖 repoRequestArgumentResolver
bean ?
顺便说一句 - QuerydslAwareRootResourceInformationHandlerMethodArgumentResolver
尴尬地不公开。 :/
最佳答案
这就是我在应用程序上下文中替换 bean 的方式。
感觉有点老套。我很想听听一个更好的方法来做到这一点。
@Configuration
public class CustomQuerydslHandlerMethodArgumentResolverConfig implements ApplicationContextAware {
/**
* This class is originally the class that instantiated QuerydslAwareRootResourceInformationHandlerMethodArgumentResolver and placed it into the Spring Application Context
* as a {@link RootResourceInformationHandlerMethodArgumentResolver} by the name of 'repoRequestArgumentResolver'.<br/>
* By injecting this bean, we can let {@link #meetupApiRepoRequestArgumentResolver} delegate as much as possible to the original code in that bean.
*/
private final RepositoryRestMvcConfiguration repositoryRestMvcConfiguration;
@Autowired
public CustomQuerydslHandlerMethodArgumentResolverConfig(RepositoryRestMvcConfiguration repositoryRestMvcConfiguration) {
this.repositoryRestMvcConfiguration = repositoryRestMvcConfiguration;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
DefaultListableBeanFactory beanFactory = (DefaultListableBeanFactory) ((GenericApplicationContext) applicationContext).getBeanFactory();
beanFactory.destroySingleton(REPO_REQUEST_ARGUMENT_RESOLVER_BEAN_NAME);
beanFactory.registerSingleton(REPO_REQUEST_ARGUMENT_RESOLVER_BEAN_NAME,
meetupApiRepoRequestArgumentResolver(applicationContext, repositoryRestMvcConfiguration));
}
/**
* This code is mostly copied from {@link RepositoryRestMvcConfiguration#repoRequestArgumentResolver()}, except the if clause checking if the QueryDsl library is
* present has been removed, since we're counting on it anyway.<br/>
* That means that if that code changes in the future, we're going to need to alter this code... :/
*/
@Bean
public RootResourceInformationHandlerMethodArgumentResolver meetupApiRepoRequestArgumentResolver(ApplicationContext applicationContext,
RepositoryRestMvcConfiguration repositoryRestMvcConfiguration) {
QuerydslBindingsFactory factory = applicationContext.getBean(QuerydslBindingsFactory.class);
QuerydslPredicateBuilder predicateBuilder = new QuerydslPredicateBuilder(repositoryRestMvcConfiguration.defaultConversionService(),
factory.getEntityPathResolver());
return new CustomQuerydslHandlerMethodArgumentResolver(repositoryRestMvcConfiguration.repositories(),
repositoryRestMvcConfiguration.repositoryInvokerFactory(repositoryRestMvcConfiguration.defaultConversionService()),
repositoryRestMvcConfiguration.resourceMetadataHandlerMethodArgumentResolver(),
predicateBuilder, factory);
}
}
这些是基于 http 查询参数创建我自己的 map 搜索谓词的代码片段。 再次 - 很想知道更好的方法。
postProcess
方法调用:
predicate = addCustomMapPredicates(parameterMap, predicate, domainType).getValue();
就在之前将 predicate
引用传递到 QuerydslRepositoryInvokerAdapter
构造函数并返回。
这是 addCustomMapPredicates
方法:
private BooleanBuilder addCustomMapPredicates(MultiValueMap<String, String> parameters, Predicate predicate, Class<?> domainType) {
BooleanBuilder booleanBuilder = new BooleanBuilder();
parameters.keySet()
.stream()
.filter(s -> s.contains("[") && matches(s) && s.endsWith("]"))
.collect(Collectors.toList())
.forEach(paramKey -> {
String property = paramKey.substring(0, paramKey.indexOf("["));
if (ReflectionUtils.findField(domainType, property) == null) {
LOGGER.warn("Skipping predicate matching on [%s]. It is not a known field on domainType %s", property, domainType.getName());
return;
}
String key = paramKey.substring(paramKey.indexOf("[") + 1, paramKey.indexOf("]"));
parameters.get(paramKey).forEach(value -> {
if (!StringUtils.hasLength(value)) {
booleanBuilder.or(matchesProperty(key, null));
} else {
booleanBuilder.or(matchesProperty(key, value));
}
});
});
return booleanBuilder.and(predicate);
}
static boolean matches(String key) {
return PATTERN.matcher(key).matches();
}
还有图案:
/**
* disallow a . or ] from preceding a [
*/
private static final Pattern PATTERN = Pattern.compile(".*[^.]\\[.*[^\\[]");
https://stackoverflow.com/questions/45989336/
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