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I want to create a Post method to update a single property from my API main Object:

@Builder
@Document(collection = "tableItems")
@NoArgsConstructor
@AllArgsConstructor
@Data
public class TableItem {

    @Id
    private String id;
    private int roundNumber;
    private RoundState roundState;
    private int bigBlind;
    private int smallBlind;
    private int maxSize;
    private int freeSeats;
    private double tableChips;
    private List<Card> tableCards;
    private List<Player> players;
    private List<Seat> seats;

}

So, this object ist save on my MongoDB. I want to add a new Player on players, but all other properties should not change!

In my GameController, I have a @RequestMapping("/api/tableitems") and my method looks like this:

@PostMapping("/{id}/players")
public void postNewPlayer(@RequestBody Player newPlayer, String tableId) {
    gameService.addNewPlayer(id, newPlayer);
}

In my GameService my addNewPlayer method looks like this:

public void addNewPlayer(Player newPlayer, String tableId) {

    TableItem tableToBeUpdated = tableItemsRepo.findById(tableId)
            .orElseThrow( () -> new NoSuchElementException(("Table with ID " + tableId + " not found!")));

    tableItemsRepo.save(newPlayer);
}

IntelliJ grumbles and throws the following error message:

Inferred type ‘S’ for type parameter ‘S’ is not within its bound; should extend ‘backend.model.TableItem’

And finally my repository looks like this:

@Repository
public interface TableItemsRepository extends MongoRepository<TableItem, String> {
}

Is it at all possible to update a single property of an object with @POST? How does it work? If not, how else can it be done? I am at a loss and would be very grateful for some help… Thanks a lot!

2

Answers


  1. Chosen as BEST ANSWER

    Thanks for the quick feedback! I have seen some thinking errors already... my Repository expects TableItems and I just give it the property I want to change(Player in Players). I also forgot by the @Post the PathVariable with the TableId.

    Through your tips I have now found a solution that also works! Here my code:

    Controller:

     @PostMapping("/{id}/players")
    public void postNewPlayer(@RequestBody Player newPlayer, @PathVariable String id) {
        gameService.addNewPlayer(newPlayer, id);
    }
    

    Service:

    public void addNewPlayer(Player newPlayer, String tableId) {
    
        TableItem tableToBeUpdated = tableItemsRepo.findById(tableId)
                .orElseThrow( () -> new NoSuchElementException(("Table with ID " + tableId + " not found!")));
        List<Player> players =  tableToBeUpdated.getPlayers();
        if( players == null) {
            players = new ArrayList<>();
            tableToBeUpdated.setPlayers(players);
        }
        players.add(newPlayer);
        tableItemsRepo.save(tableToBeUpdated);
    }
    

    I did not have to change anything in the repo. The result it looks like this in the DB:

    {
       "roundNumber": 2,
       "bigBlind": 20,
       "smallBlind": 10,
       "maxSize": 2,
       "freeSeats": 2,
       "tableChips": 0,
       "tableCards": [
       {
          "rank": "FIVE",
          "suit": "HEARTS"
      },
      {
         "rank": "SEVEN",
         "suit": "SPADES"
      }
      ],
      "players": [
      {
         "playerName": "brasuca",
         "playerChips": 1000,
         "playerCards": [
         {
            "rank": "SEVEN",
            "suit": "HEARTS"
        },
        {
           "rank": "KING",
           "suit": "HEARTS"
        }
      ]
    }
    ]}
    

    Thank you very much for your help!!


  2. you can have 2 solutions:

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