Json content for One post in Many to one rs request in spring boot - spring-boot

Question

So i have two classes,
class User:
#Data
#NoArgsConstructor
#Entity
public class User {
#Id
#GeneratedValue
private int id;
private String displayName;
private String email;
private String gender;
private String Nationality;
private int age;
#OneToMany(mappedBy = "id", cascade = CascadeType.ALL)
private List<Event> createdEvents;
#OneToMany(mappedBy = "id", cascade = CascadeType.ALL)
private List<Reservation> clientReservations;
}
and class Event:
#Data
#Entity
public class Event {
#Id
#GeneratedValue
private int id;
private String eventName;
private Date eventDate;
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "created_at", nullable = false, updatable = false)
#CreatedDate
private Date createdAt;
#ManyToOne
#JoinColumn(name="user_id")
private User user;
}
Contoller class:
#RestController
#RequestMapping("/event")
public class EventController {
#Autowired
private EventRepository eventRepository;
#PostMapping("/create")
public Event addEvent(#RequestBody Event event) {
return eventRepository.save(event);
}
}
Json:
"eventName": "theatre",
"eventDate": "2020-04-22",
"user": 3
im new to spring boot and what I've tried doesn't work.
now i want to add a single Event, and i need to pass a user id to reference the user who created the event, How can i do it ?

Answer 1

1.
In your Event class, add a constructor like this:
public Event(String eventName, Date eventDate, User user) {
this.createdAt = new DateTime();
this.eventName = eventName;
this.eventDate = eventDate;
this.user = user;
}
2.
Instead of passing Event as #RequestBody, consider creating a dto that handles submitted data on Post requests
public class EventDto {
private String eventName;
private String eventDateString;
private Long userId;
public String getEventName() {
return eventName;
}
public void setEventName(String eventName) {
this.eventName = eventName;
}
public String getEventDateString() {
return eventDateString;
}
public void setEventDateString(String eventDateString) {
this.eventDateString = eventDateString;
}
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
}
Then you must replace #RequestBody Event event with #RequestBody EventDto eventDto
3.
Inject UserRepository, handle data, check that submitted user id exists and save your Event
#PostMapping("/create")
public Event addEvent(#RequestBody EventDto eventDto) throws ParseException {
var user = userRepository.findById(eventDto.getUserId());
if (user.isPresent()) {
Event event = new Event(eventDto.eventName.trim(), new SimpleDateFormat("yyyy-MM-dd").parse(eventDto.eventDateString), user.get());
eventRepository.save(event);
}
}