text: from django.conf import settings
  from rest_framework import serializers
  
  from core.models import UserModel
  
  
  class ReadOnlyUserLinkSerializer(serializers.ModelSerializer):
  	avatar = serializers.SerializerMethodField()
  
  	def get_avatar(self, obj):
  		request = self.context.get('request')
  		if obj.avatar:
  			return request.build_absolute_uri(obj.avatar.url)
  
  		return settings.DEFAULT_NO_IMAGE_URL
  
  	class Meta:
  		model = UserModel
  		read_only_fields = ('id', 'username', 'avatar')
  		fields = ('id', 'username', 'avatar')
  