final all done 2nd last plan before goign live

backend/igny8_core/business/notifications/serializers.py

@@ -0,0 +1,90 @@
+"""
+Notification Serializers
+"""
+
+from rest_framework import serializers
+
+from .models import Notification
+
+
+class NotificationSerializer(serializers.ModelSerializer):
+    """Serializer for Notification model"""
+    
+    site_name = serializers.CharField(source='site.name', read_only=True, default=None)
+    
+    class Meta:
+        model = Notification
+        fields = [
+            'id',
+            'notification_type',
+            'title',
+            'message',
+            'severity',
+            'site',
+            'site_name',
+            'action_url',
+            'action_label',
+            'is_read',
+            'read_at',
+            'metadata',
+            'created_at',
+        ]
+        read_only_fields = ['id', 'created_at', 'read_at']
+
+
+class NotificationListSerializer(serializers.ModelSerializer):
+    """Lightweight serializer for notification lists"""
+    
+    site_name = serializers.CharField(source='site.name', read_only=True, default=None)
+    time_ago = serializers.SerializerMethodField()
+    
+    class Meta:
+        model = Notification
+        fields = [
+            'id',
+            'notification_type',
+            'title',
+            'message',
+            'severity',
+            'site_name',
+            'action_url',
+            'action_label',
+            'is_read',
+            'created_at',
+            'time_ago',
+            'metadata',
+        ]
+    
+    def get_time_ago(self, obj):
+        """Return human-readable time since notification"""
+        from django.utils import timezone
+        from datetime import timedelta
+        
+        now = timezone.now()
+        diff = now - obj.created_at
+        
+        if diff < timedelta(minutes=1):
+            return 'Just now'
+        elif diff < timedelta(hours=1):
+            minutes = int(diff.total_seconds() / 60)
+            return f'{minutes} minute{"s" if minutes != 1 else ""} ago'
+        elif diff < timedelta(days=1):
+            hours = int(diff.total_seconds() / 3600)
+            return f'{hours} hour{"s" if hours != 1 else ""} ago'
+        elif diff < timedelta(days=7):
+            days = diff.days
+            if days == 1:
+                return 'Yesterday'
+            return f'{days} days ago'
+        else:
+            return obj.created_at.strftime('%b %d, %Y')
+
+
+class MarkReadSerializer(serializers.Serializer):
+    """Serializer for marking notifications as read"""
+    
+    notification_ids = serializers.ListField(
+        child=serializers.IntegerField(),
+        required=False,
+        help_text='List of notification IDs to mark as read. If empty, marks all as read.'
+    )