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Python Django REST Framework Security and Customization Validate Field

A player with an age of 13 was rejected!; A player over 13 was rejected!; A young player was accepted as valid!

I've added an age field to the Player model and serializer. Now, I know and you know that people under the age of 13 can play games but the powers-that-be have decided we can't track players that are younger than 13.

So, add a method to the Player serializer to validate the age field. If the player is younger than 13, throw a ValidationError with a message of "Player age must be 13 or over".

I keep getting this error not sure what to do please help

scorekeeper/serializers.py
from rest_framework import serializers

from . import models


class GameSerializer(serializers.ModelSerializer):
    class Meta:
        fields = ('id', 'name')
        model = models.Game


class PlayerSerializer(serializers.ModelSerializer):
    class Meta:
        fields = ('id', 'name', 'age', 'parent_approval')
        model = models.Player

    def validate_age(self, value):
        if value in range(16, 13):
            return value
        raise serializers.ValidationError(
            'Player age must be over 13')


class ScoreSerializer(serializers.ModelSerializer):
    game = serializers.HyperlinkedRelatedField(
        read_only=True, view_name='apiv2:game-detail')
    player = serializers.HyperlinkedRelatedField(
        read_only=True, view_name='apiv2:player-detail')

    class Meta:
        fields = ('id', 'game', 'player', 'score')
        model = models.Score