Document/fix conference versions view

CHANGES.md

@@ -26,6 +26,15 @@ have collected.
 bundle exec rake data:drop_all_ahoy_events RAILS_ENV=production
 ```
 
+### Conference wide revision history
+There is now a conference wide revision history that will show organizers
+everything that is happening. To be able to do this we need to change old
+data.
+
+```
+bundle exec rake data:set_conference_in_versions RAILS_ENV=production
+```
+
 # Changes in OSEM 1.0
 
 [Released May 24, 2016](https://osem.io/1.0)

app/views/admin/versions/_object_desc_and_link.html.haml

@@ -79,8 +79,8 @@
   = link_to (current_or_last_object_state('Event', object.event_id).try(:title) || 'deleted'),
            admin_conference_program_event_path(conference_short_title, object.event_id)
   in
-  =  link_to "Schedule #{event_schedule.schedule_id}",
-            admin_conference_schedule_path(conference_short_title, event_schedule.schedule_id)
+  =  link_to "Schedule #{version.item.schedule_id}",
+            admin_conference_schedule_path(conference_short_title, version.item.schedule_id)
 
 - when 'Schedule'
   = link_if_alive version, "Schedule #{version.item_id}",

lib/tasks/version.rake

@@ -10,8 +10,12 @@ namespace :data do
         version.update_attributes(conference_id: version.item_id)
 
       elsif version.item_type == 'Event'
-        event = (version.item || version.reify || version.next.reify)
-
+        event = version.item
+        unless event || Event.find_by(id: version.item_id)
+          puts 'Not updating versions of deleted event...'
+          next
+        end
+        event ||= (version.reify || version.next.reify)
         conference_id = if event.try(:program)
                           event.program.conference_id
                         # Event had attribute conference_id before it was replaced with program_id