Using backref instead of a manual query

server/db.py

@@ -13,7 +13,7 @@ class Game(db.Model):
     timer = db.Column(db.Integer)
     rounds = db.Column(db.Integer)
     coordinates = db.relationship("Coordinate", lazy=True, order_by="Coordinate.round_number")
-    players = db.relationship("Player", lazy=True)
+    players = db.relationship("Player", lazy=True, backref="game")
 
     @staticmethod
     def create(timer, rounds):
@@ -81,7 +81,7 @@ class Player(db.Model):
         if len(self.guesses) == 0:
             return 1
         next_round = self.guesses[-1].round_number + 1
-        if next_round <= Game.query.get(self.game_id).rounds:
+        if next_round <= self.game.rounds:
             return next_round
         return None