from rest_framework import serializers class GetNotifSerializer(serializers.ModelSerializer): send_by = UserSerializer() is_seen = serializers.SerializerMethodField() read_by = UserSerializer(many=True) class Meta: model = NotifModel fields = ('id', 'subject', 'priority', 'description', 'send_time', 'is_seen', 'send_by', 'read_by') read_only_fields = ("read_by", "send_by") def get_is_seen(self, obj): user = self.context['user'] return user in obj.read_by.all()