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how to post data to foreign key in django rest framework

class ProfileSerializer(serializers.ModelSerializer):
    class Meta:
        model=Profile
        fields=('id','user','email','birthday','gender','bio','points')
        read_only_fields = ('created','updated')

    def to_representation(self, instance):
        self.fields['user'] =  UserSerializer(read_only=True)
        return super(ProfileSerializer, self).to_representation(instance)

how to post data to foreign key in django rest framework

class ArticleSerializer(serializers.ModelSerializer):
    tags = serializers.CharField()

    class Meta:
        model = Article
        fields = '__all__'

    def create(self, validated_data):
        tag = validated_data.pop('tags')
        tag_instance, created = Tag.objects.get_or_create(name=tag)
        article_instance = Article.objects.create(**validated_data, tags=tag_instance)
        return article_instance

how to post data to foreign key in django rest framework

class ContentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Content
        fields = ('title', 'body', 'topic')

    def to_representation(self, instance):
        response = super().to_representation(instance)
        response['topic'] = TopicSerializer(instance.topic).data
        return response