Add custom_data column to paper_trail versions table so we can track a specific list of ids in a model

Activate paper_trail in order_cycles and schedules and track each others ids

An alternative way of doing this would be to use a gem for paper_trail associations but this way we avoid adding a new dependency to the app

app/models/order_cycle.rb

@@ -17,6 +17,7 @@ class OrderCycle < ActiveRecord::Base
   has_many :distributors, source: :receiver, through: :cached_outgoing_exchanges, uniq: true
 
   has_and_belongs_to_many :schedules, join_table: 'order_cycle_schedules'
+  has_paper_trail meta: { custom_data: :schedule_ids }
 
   attr_accessor :incoming_exchanges, :outgoing_exchanges
 

app/models/schedule.rb

@@ -1,5 +1,7 @@
 class Schedule < ActiveRecord::Base
   has_and_belongs_to_many :order_cycles, join_table: 'order_cycle_schedules'
+  has_paper_trail meta: { custom_data: :order_cycle_ids }
+
   has_many :coordinators, uniq: true, through: :order_cycles
 
   attr_accessible :name, :order_cycle_ids