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Python Django REST Framework Security and Customization Validate Two Fields

Posted by Savious Munyaradzi Ngundu
Savious Munyaradzi Ngundu
16,920 Points

validate 2 fields

im stuck

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 >= 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

1 Answer

diogorferreira
diogorferreira
19,363 Points
diogorferreira
diogorferreira
19,363 Points

Hey Savious, I'd recommend reading the docs and going to the section labeled Object Level Validation, it allows you to validate multiple fields, which is needed for this challenge.

  • First, you'd create a validate method, that takes self and data (data being all the values passed in)
  • Then check whether the player is less than 13 and has parent_approval
  • If they don't then raise a serializers.ValidationError() with "Children under 13 require parental approval"
  • Otherwise, just return the data passed into the validation method

Hopefully you can solve it with that, if you need any more help then the code below is an example of what it could look like.

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')
        return data

Hope it helps!