我怎麼能力彈簧DATA REST @PathVariable實體存在

Question

對於注射@PathVariable實體我的意思是

@RequestMapping(method = RequestMethod.PUT, path = "{project-id}") 
@Transactional 
@PreAuthorize("#user.id == #project.userId") 
public Object update(@P("user") @Current User user, 
        @P("project") @PathVariable Project entity, 
        @RequestBody @Valid ProjectPost request) { 
    setProjectPostToEntity(entity, request); 

    return ResponseEntity.ok(ImmutableMap.of("message", "Project update successful")); 
} 

但@PathVariable Project entity將是無效的，如果不project-id在庫中找到，我想是這樣的

@RequestMapping(method = RequestMethod.PUT, path = "{project-id}") 
@Transactional 
@PreAuthorize("#user.id == #project.userId") 
public Object update(@P("user") @Current User user, 
        @P("project") @PathVariable @Valid @NotNull(message="Update project not exists") Project entity, 
        @RequestBody @Valid ProjectPost request) { 
    setProjectPostToEntity(entity, request); 

    return ResponseEntity.ok(ImmutableMap.of("message", "Project update successful")); 
} 

如果在庫中找不到project-id將返回消息Update project not exists，但@Valid @NotNull(message="Update project not exists")在這裏不起作用，我該怎麼做這樣的事情？

Answer 1

用方法setProjectPostToEntity(entity, request)創建服務並用@Transactional和@PreAuthorize註釋它。該方法保證你的變量將存在。 而在控制器方法有關@Transactional：https://stackoverflow.com/a/23120647/5649869