Question

我有来自CRUD控制器的方法“更新”：

@PutMapping(value = "/{id}")
public ResponseEntity<?> update(
        @PathVariable("id") Long id,
        @RequestBody Entity entity
) {
    repository.saveAndFlush(entity);
    return ResponseEntity.ok(entity);
}

这是代码创建实体的新实例。如何将RequestBody映射到现有实体？类似的东西：

public ResponseEntity<?> update(
        @RequestBody @LoadById(@PathVariable("id")) Entity entity
)

感谢。

Answer 1

映射示例：

@RequestMapping(method = RequestMethod.PUT, value = "/{id}")
public ResponseEntity<?> update(
        @PathVariable("id") Long id,
        @Valid @RequestBody Entity entity
) {
    Entity oldEntity = repository.findOne(id);

    AnnotatedClass annotatedClass = AnnotatedClass.construct(
            entity.getClass(),
            objectMapper.getDeserializationConfig().getAnnotationIntrospector(),
            new SimpleMixInResolver(null)
    );

    Iterator<AnnotatedField> fields = annotatedClass.fields().iterator();
    while (fields.hasNext()) {
        AnnotatedField field = fields.next();
        if (!objectMapper.getDeserializationConfig().getAnnotationIntrospector().hasIgnoreMarker(field)) {
            field.fixAccess();
            field.setValue(oldEntity, field.getValue(entity));
        }
    }

    repository->save(oldEntity);
    return ResponseEntity.ok(oldEntity);
}

如何映射到存在对象？

1 个答案: