java如何将JpaRepository结果转换为自定义DTO类

Question

我想一页一页地转换

所以我就这样实现了

@GetMapping("/history")
public Page<ResponseAllHistoryDto> getAllHistory() {
    Pageable pageable = PageRequest.of(0, 20, Sort.by("createdAt"));
    Page<History> histories = historyRepository.findAll(pageable);
    return histories.map(history -> {
       return ResponseAllHistoryDto.builder()
               .history(history)
               .tags(tagRepository.findByHistoryHistoryId(history.getHistoryId()))
               .auths(authRepository.findByHistoryHistoryId(history.getHistoryId()))
               .build();
    });
}

可悲的是。它给我

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class com.wrapsody.demo.ResponseAllHistoryDto and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.data.domain.PageImpl["content"]->java.util.Collections$UnmodifiableRandomAccessList[0])

问题是什么……：(

Answer 1

类需要有一个默认构造函数、getter和setter。试着用lombok的@Data注释它