Add parent group field

aleksis/apps/csv_import/field_types.py

@@ -426,6 +426,19 @@ class GroupMembershipByShortNameFieldType(ProcessFieldType):
             pass
 
 
+@field_type_registry.register
+class ParentGroupByShortNameFieldType(ProcessFieldType):
+    name = "parent_group_short_name"
+    verbose_name = _("Short name of the group's parent group")
+
+    def process(self, instance: Model, value):
+        group, __ = Group.objects.get_or_create(
+            short_name=value, school_term=self.school_term, defaults={"name": value}
+        )
+        instance.parent_groups.add(group)
+        instance.save()
+
+
 @field_type_registry.register
 class ChildByUniqueReference(ProcessFieldType):
     name = "child_by_unique_reference"