Fix field references

aleksis/apps/alsijil/models.py

@@ -558,7 +558,7 @@ class Documentation(CalendarEvent):
                 continue
 
             event_reference_obj = event["REFERENCE_OBJECT"]
-            existing_documentations = event_reference_obj.documentation.filter(
+            existing_documentations = event_reference_obj.amended_by.filter(
                 datetime_start=event["DTSTART"].dt,
                 datetime_end=event["DTEND"].dt,
             )
@@ -635,7 +635,7 @@ class ParticipationStatus(CalendarEvent):
     )
 
     def __str__(self) -> str:
-        return f"{self.documentation}, {self.person}"
+        return f"{self.related_documentation}, {self.person}"
 
     class Meta:
         verbose_name = _("Participation Status")

aleksis/apps/alsijil/schema/documentation.py

@@ -10,6 +10,7 @@ from reversion import create_revision, set_comment, set_user
 
 from aleksis.apps.alsijil.util.predicates import can_edit_documentation, is_in_allowed_time_range
 from aleksis.apps.chronos.models import LessonEvent
+from aleksis.apps.chronos.schema import LessonEventType
 from aleksis.apps.cursus.models import Subject
 from aleksis.apps.cursus.schema import CourseType, SubjectType
 from aleksis.core.models import Person
@@ -45,6 +46,7 @@ class DocumentationType(PermissionsTypeMixin, DjangoFilterMixin, DjangoObjectTyp
         }
 
     course = graphene.Field(CourseType, required=False)
+    amends = graphene.Field(lambda: LessonEventType, required=False)
     subject = graphene.Field(SubjectType, required=False)
 
     future_notice = graphene.Boolean(required=False)