feat(events): harden registration checkout lifecycle

apps/events/admin.py

@@ -7,6 +7,7 @@ from core.templatetags.jalali import jdate
 from apps.events.models import Event, Registration
 from apps.events.resources import EventResource, RegistrationResource
 from apps.events.services import verify_registration_attendance
+from apps.events.checkout import cancel_event_checkouts
 
 
 @admin.register(Event)
@@ -79,8 +80,14 @@ class EventAdmin(BaseModelAdmin, ImportExportModelAdmin):
 
     @admin.action(description='Mark selected events as cancelled')
     def make_cancelled(self, request, queryset):
-        queryset.update(status=Event.StatusChoices.CANCELLED)
-        self.message_user(request, f'Cancelled {queryset.count()} events.')
+        count = 0
+        for event in queryset:
+            if event.status != Event.StatusChoices.CANCELLED:
+                event.status = Event.StatusChoices.CANCELLED
+                event.save(update_fields=['status'])
+                cancel_event_checkouts(event.pk)
+                count += 1
+        self.message_user(request, f'Cancelled {count} events.')
 
     @admin.action(description='Mark selected events as completed')
     def make_completed(self, request, queryset):
@@ -93,15 +100,27 @@ class EventAdmin(BaseModelAdmin, ImportExportModelAdmin):
             event.restore()
         self.message_user(request, f'Restored {queryset.count()} events.')
 
+    def save_model(self, request, obj, form, change):
+        previous_status = None
+        if change and obj.pk:
+            previous_status = Event.all_objects.filter(pk=obj.pk).values_list("status", flat=True).first()
+        super().save_model(request, obj, form, change)
+        if previous_status != Event.StatusChoices.CANCELLED and obj.status == Event.StatusChoices.CANCELLED:
+            cancel_event_checkouts(obj.pk)
+
 
 @admin.register(Registration)
 class RegistrationAdmin(BaseModelAdmin, ImportExportModelAdmin):
     resource_class = RegistrationResource
     list_display = (
-        'user', 'event', 'status', 'registered_at', 'ticket_id',
+        'user', 'event', 'status', 'registered_at', 'checkout_expires_at',
+        'cancellation_reason', 'ticket_id',
         'discount_code', 'discount_amount', 'final_price',
     )
-    list_filter = ('status', 'event', 'is_deleted', 'registered_at', SoftDeleteListFilter)
+    list_filter = (
+        'status', 'cancellation_reason', 'event', 'is_deleted', 'registered_at',
+        SoftDeleteListFilter,
+    )
     search_fields = (
         'user__username', 'user__email', 'user__first_name', 'user__last_name',
         'event__title', 'ticket_id',
@@ -109,13 +128,15 @@ class RegistrationAdmin(BaseModelAdmin, ImportExportModelAdmin):
     readonly_fields = (
         'ticket_id', 'registered_at', 'confirmation_notification_sent_at',
         'cancellation_notification_sent_at', 'discount_code', 'discount_amount',
-        'final_price', 'deleted_at', 'attendance_verified_at',
+        'final_price', 'checkout_started_at', 'checkout_expires_at',
+        'cancellation_reason', 'deleted_at', 'attendance_verified_at',
         'attendance_verified_by', 'attendance_verification_source',
     )
     fieldsets = (
         ('Registration Details', {'fields': (
             'user', 'event', 'status', 'registered_at', 'ticket_id',
             'confirmation_notification_sent_at', 'cancellation_notification_sent_at',
+            'checkout_started_at', 'checkout_expires_at', 'cancellation_reason',
         )}),
         ('Attendance verification', {'fields': (
             'attendance_verified_at', 'attendance_verified_by', 'attendance_verification_source',