feat: add is_scheduled column to submission admin

Add a new column in the submission admin that shows whether a submission
is scheduled in the conference. The column displays a boolean checkmark
using Django's admin.display decorator with boolean=True.

- Add `is_scheduled` to list_display in SubmissionAdmin
- Implement `is_scheduled` method that checks if submission has schedule items
- Optimize queryset with prefetch_related for schedule_items to avoid N+1
- Add tests for the new is_scheduled method

Closes #4585

Co-authored-by: Marco Acierno <marcoacierno@users.noreply.github.com>

Author: github-actions[bot]

backend/submissions/admin.py

@@ -222,6 +222,7 @@ class SubmissionAdmin(ExportMixin, ConferencePermissionMixin, admin.ModelAdmin):
         "speaker_display_name",
         "type",
         "status",
+        "is_scheduled",
         "conference",
         "open_submission",
         "inline_tags",
@@ -306,6 +307,15 @@ def speaker_display_name(self, obj):
     def inline_tags(self, obj):
         return ", ".join([tag.name for tag in obj.tags.all()])
 
+    @admin.display(
+        description="Scheduled",
+        boolean=True,
+    )
+    def is_scheduled(self, obj):
+        # Use bool() on all() to utilize prefetch_related data instead of exists()
+        # which would issue an additional query
+        return bool(obj.schedule_items.all())
+
     @admin.display(
         description="Open",
     )
@@ -318,7 +328,7 @@ def open_submission(self, obj):  # pragma: no cover
         )
 
     def get_queryset(self, request):
-        return super().get_queryset(request).prefetch_related("tags")
+        return super().get_queryset(request).prefetch_related("tags", "schedule_items")
 
     class Media:
         js = ["admin/js/jquery.init.js"]

backend/submissions/tests/test_admin.py

@@ -3,7 +3,9 @@
 from notifications.tests.factories import EmailTemplateFactory
 from notifications.models import EmailTemplateIdentifier, SentEmail
 import pytest
+from schedule.tests.factories import ScheduleItemFactory
 from submissions.admin import (
+    SubmissionAdmin,
     apply_and_notify_status_change,
     send_proposal_in_waiting_list_email_action,
     send_proposal_rejected_email_action,
@@ -14,6 +16,25 @@
 pytestmark = pytest.mark.django_db
 
 
+def test_is_scheduled_returns_true_when_submission_has_schedule_items():
+    submission = SubmissionFactory()
+    ScheduleItemFactory(
+        submission=submission,
+        conference=submission.conference,
+        type="submission",
+    )
+
+    admin = SubmissionAdmin(model=Submission, admin_site=None)
+    assert admin.is_scheduled(submission) is True
+
+
+def test_is_scheduled_returns_false_when_submission_has_no_schedule_items():
+    submission = SubmissionFactory()
+
+    admin = SubmissionAdmin(model=Submission, admin_site=None)
+    assert admin.is_scheduled(submission) is False
+
+
 def test_send_proposal_rejected_email_action(rf, mocker):
     mock_task = mocker.patch("submissions.admin.send_proposal_rejected_email")
     mocker.patch("submissions.admin.messages")