text: from rest_framework import serializers
  from .models import Country
  
  class CountrySerializer(serializers.ModelSerializer):
      class Meta:
          model = Country
          fields = ('code', 'name', 'allowed_from', 'restriction_level')
  
  class CountrySerializerBasic(serializers.ModelSerializer):
      class Meta:
          model = Country
          fields = ('code', 'name')