Add SupervisionEvent model for supervisions

aleksis/apps/chronos/models.py

@@ -1380,6 +1380,7 @@ class LessonEvent(CalendarEvent):
         Group,
         related_name="lesson_events",
         verbose_name=_("Groups"),
+        blank=True,
     )
 
     rooms = models.ManyToManyField(
@@ -1477,3 +1478,19 @@ class LessonEvent(CalendarEvent):
     class Meta:
         verbose_name = _("Lesson Event")
         verbose_name_plural = _("Lesson Events")
+
+
+class SupervisionEvent(LessonEvent):
+    name = "supervision"
+    verbose_name = _("Supervisions")
+
+
+    @classmethod
+    def value_title(cls, reference_object: "LessonEvent") -> str:
+        """Get the title of the event."""
+
+        return _("Supervision: {}").format(reference_object.room_names)
+
+    @classmethod
+    def value_description(cls, reference_object: "LessonEvent") -> str:
+        return render_to_string("chronos/supervision_event_description.txt", {"event": reference_object})
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aleksis/apps/chronos/templates/chronos/lesson_event_description.txt

+{% load i18n %}{% trans "Groups" %}: {{ event.group_names }}
+{% trans "Subject" %}: {{ event.subject }}
+{% trans "Teachers" %}: {{ event.teacher_names }}
+{% trans "Rooms" %}: {{ event.room_names }}
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aleksis/apps/chronos/templates/chronos/supervision_event_description.txt

+{% load i18n %}{% trans "Teachers" %}: {{ event.teacher_names }}
+{% trans "Areas" %}: {{ event.room_names }}
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