db/migrate/20150111192335_subscribe_old_changesets.rb

   1 class SubscribeOldChangesets < ActiveRecord::Migration[4.2]
   2   class Changeset < ActiveRecord::Base
   3   end
   4
   5   def up
   6     Changeset.find_each do |changeset|
   7       changeset.subscribers << changeset.user unless changeset.subscribers.exists?(changeset.user.id)
   8     end
   9   end
  10
  11   def down; end
  12 end