Django Rest Framework - Nested Serializer Attribute error in response
wondering if someone could help me with the following problem.
I have a serialises such as this:
class LineupPlayerSerializer(serializers.ModelSerializer):
id = serializers.UUIDField(write_only=True)
name = serializers.CharField(read_only=True)
positionType = serializers.CharField(read_only=True)
alternativePositions = serializers.CharField(read_only=True, required=False, allow_blank=True)
shirtNumber = serializers.IntegerField(read_only=True, required=False, allow_null=True)
positionOnPitch = serializers.IntegerField(required=True)
class Meta:
model = LineupPlayer
fields = ['id', 'positionType', 'alternativePositions', 'name', 'shirtNumber', 'positionOnPitch']
def create(self, validated_data):
player_id = validated_data.pop('id')
player = Player.objects.get(id=player_id)
position_on_pitch = validated_data.pop('positionOnPitch')
lineup = validated_data.pop('lineup')
lineup_player = LineupPlayer.objects.create(lineup=lineup, player=player, positionOnPitch=position_on_pitch)
return lineup_player
class LineupSerializer(serializers.ModelSerializer):
players = LineupPlayerSerializer(many=True)
class Meta:
model = Lineup
fields = ['id', 'formation', 'players']
def create(self, validated_data):
try:
players_data = validated_data.pop('players')
lineup = Lineup.objects.create(**validated_data)
for player_data in players_data:
player_data['lineup'] = lineup
LineupPlayerSerializer().create(player_data)
return lineup
except Exception as e:
print(f"Error: {e}")
raise e
However, when I send the request I get an Attribute error:
Got AttributeError when attempting to get a value for field `positionOnPitch` on serializer `LineupPlayerReadSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `Player` instance.
Original exception text was: 'Player' object has no attribute 'positionOnPitch'.
For some reason Django thinks that the positionOnPitch is in the Player model and I can't figure out how. When I use write_only=True for positionOnPitch it sends the request OK so it has only a problem when getting the positionOnPitch.
My models:
class Lineup(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
formation = models.CharField(max_length=10)
players = models.ManyToManyField(Player, through='LineupPlayer', through_fields=('lineup', 'player'))
def __str__(self):
return self.formation
class Meta:
verbose_name = "Lineup"
verbose_name_plural = "Lineups"
class LineupPlayer(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
lineup = models.ForeignKey(Lineup, on_delete=models.CASCADE, related_name='lineup')
player = models.ForeignKey(Player, on_delete=models.CASCADE, related_name='player')
positionOnPitch = models.PositiveSmallIntegerField()
def __str__(self):
return f"{self.player.name} in {self.lineup.formation}"
class Meta:
verbose_name = "Lineup Player"
verbose_name_plural = "Lineup Players"
and Player model:
class Player(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
name = models.CharField(max_length=50)
shirtNumber = models.SmallIntegerField(default=None, blank=True, null=True)
positionType = models.ForeignKey(Position, on_delete=models.CASCADE, related_name='positionType')
alternativePositions = models.ForeignKey(Position, on_delete=models.CASCADE, blank=True, null=True ,related_name='alternativePositions')
active = models.BooleanField(default=True)
injured = models.BooleanField(default=False, blank=True)
def __str__(self):
return self.name
class Meta:
verbose_name = "Player"
verbose_name_plural = "Players"
Can anyone see what could be the problem? I tried searching but couldn't find anything similar, maybe my logic is completely wrong? I have tried using copilot but that wasn't useful since it thinks there's nothing wrong with it. Any help more than welcome. I have spent already a few days on it, tried few things but getting the positionOnPitch just doesn't work. If you need any more information let me know, please. Thank you