Create an index of all history changes

apiserver/apiserver/api/signals.py

@@ -0,0 +1,61 @@
+from django.dispatch import receiver
+from simple_history.signals import (
+    pre_create_historical_record,
+    post_create_historical_record
+)
+
+from . import models
+from .permissions import is_admin_director
+
+def get_object_owner(obj):
+    full_name = lambda member: member.first_name + ' ' + member.last_name
+
+    if getattr(obj, 'user', False):
+        return full_name(obj.user.member), obj.user.member.id
+
+    if getattr(obj, 'instructor', False):
+        return full_name(obj.instructor.member), obj.instructor.member.id
+
+    if getattr(obj, 'member_id', False):
+        try:
+            member = models.Member.objects.get(id=obj.member_id)
+            return full_name(member), member.id
+        except models.Member.DoesNotExist:
+            pass
+
+    return 'Protospace', 0
+
+@receiver(post_create_historical_record, dispatch_uid='create_hist')
+def post_create_historical_record_callback(
+        sender,
+        instance,
+        history_instance,
+        history_change_reason,
+        history_user,
+        using,
+        **kwargs):
+
+    changes = history_instance.diff_against(history_instance.prev_record).changes
+
+    if changes:
+        owner = get_object_owner(instance)
+
+        index = models.HistoryIndex.objects.create(
+            content_object=history_instance,
+            owner_name=owner[0],
+            owner_id=owner[1],
+            history_user=history_user,
+            history_date=history_instance.history_date,
+            history_type=history_instance.get_history_type_display(),
+            revert_url=history_instance.revert_url(),
+            is_system=bool(history_user == None),
+            is_admin=is_admin_director(history_user),
+        )
+
+        for change in changes:
+            models.HistoryChange.objects.create(
+                index=index,
+                field=change.field,
+                old=change.old,
+                new=change.new,
+            )