Moves sponsor email attribute from conference to contact

db/migrate/20140930092923_move_sponsor_email_to_contact.rb

@@ -0,0 +1,26 @@
+class MoveSponsorEmailToContact < ActiveRecord::Migration
+  class TempConference < ActiveRecord::Base
+    self.table_name = 'conferences'
+  end
+
+  class TempContact < ActiveRecord::Base
+    self.table_name = 'contacts'
+  end
+
+  def change
+    add_column :contacts, :sponsor_email, :string
+
+    TempConference.all.each do |conference|
+      contact = TempContact.find_by(conference_id: conference.id)
+      if contact
+        contact.sponsor_email = conference.sponsor_email
+        contact.save
+      else
+        Contact.create(conference_id: conference.id,
+                       sponsors_email: conference.sponsor_email)
+      end
+    end
+
+    remove_column :conferences, :sponsor_email
+  end
+end