fix migration

db/migrate/20140717110124_delete_events_without_user.rb

@@ -1,45 +1,37 @@
 class DeleteEventsWithoutUser < ActiveRecord::Migration
+
+  class TempEvent < ActiveRecord::Base
+    self.table_name = 'events'
+  end
+
+  class TempUser < ActiveRecord::Base
+    self.table_name = 'users'
+  end
+
+  class TempEventUser < ActiveRecord::Base
+    self.table_name = 'event_users'
+    attr_accessible :event_id, :user_id, :event_role
+  end
+
   def up
-    # User deletion without all the proper dependent: :destroy options might have left
-    # Events without a submitter (event_user association is deleted, but Event itslef is not)
-    Event.all.each do |event|
-      if event.submitter.blank? || event.speakers.first.blank?
-        if event.start_time.present? # If event is scheduled
-
-          # Create dummy user
-          unless (user = User.find_by(email: 'deleted@localhost.com'))
-            user = User.new(email: 'deleted@localhost.com', name: 'User deleted',
-                                biography: 'Data is no longer available for deleted user.',
-                                password: Devise.friendly_token[0, 20])
-            user.skip_confirmation!
-            user.save!
-          end
-
-          # Event without submitter
-          unless event.event_users.where(event_role: 'submitter').present?
-            event.event_users.create!(user: user, event_role: 'submitter')
-          end
-
-          # Event without speaker
-          unless event.event_users.where(event_role: 'speaker').present?
-            event.event_users.create!(user: user, event_role: 'speaker')
-          end
-
-          event.event_users.each do |eu|
-           unless eu.user.present?
-             eu.user = user
-             eu.save!
-           end
-          end
-
-        else
-          event.destroy
+    TempEvent.all.each do |event|
+      if TempEventUser.where(event_id: event).blank?
+        # Create dummy user
+        unless (user = User.find_by(email: 'deleted@localhost.osem'))
+          user = User.new(email: 'deleted@localhost.osem', name: 'User deleted',
+                              biography: 'Data is no longer available for deleted user.',
+                              password: Devise.friendly_token[0, 20])
+          user.skip_confirmation!
+          user.save!
         end
+
+        TempEventUser.create!(event_id: event.id, user_id: user.id, event_role: 'submitter')
+        TempEventUser.create!(event_id: event.id, user_id: user.id, event_role: 'speaker')
       end
     end
   end
 
   def down
-    raise ActiveRecord::IrreversibleMigration.new('Cannot reverse migration. Deleted events cannot be re-created')
+    raise ActiveRecord::IrreversibleMigration, 'Cannot reverse migration. Events deleted cannot be re-created'
   end
 end