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Python Django REST Framework Security and Customization Validate Field

not sure where am wrong

where am I going wrong

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(self, data):
        if data['age'] < 13 and not data['parent_approval']:
            raise serializers.ValidationError('Children under 13 require parental approval')
        else:
            return data


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