# apps/notification/serializers.py
from rest_framework import serializers
from apps.notification.models import Notification
from apps.accounts.models import User

class NotificationSerializer(serializers.ModelSerializer):
    sender = serializers.PrimaryKeyRelatedField(queryset=User.objects.all())
    receiver = serializers.PrimaryKeyRelatedField(read_only=True)
    created_at = serializers.DateTimeField(format='%Y-%m-%d %H:%M:%S', read_only=True)

    class Meta:
        model = Notification
        fields = [
            'id', 'sender', 'receiver', 'title', 'content', 'type',
            'related_resource', 'is_read', 'created_at'
        ]
        read_only_fields = ['id', 'receiver', 'created_at', 'is_read']