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

config/initializers/paper_trail.rb

@@ -1 +1,7 @@
 PaperTrail.config.track_associations = false
+
+module PaperTrail
+  class Version < ActiveRecord::Base
+    attr_accessible :custom_data
+  end
+end

db/migrate/20191202165700_add_custom_data_to_versions.rb

@@ -0,0 +1,5 @@
+class AddCustomDataToVersions < ActiveRecord::Migration
+  def change
+    add_column :versions, :custom_data, :string
+  end
+end

db/schema.rb

@@ -1202,6 +1202,7 @@ ActiveRecord::Schema.define(:version => 20191023172424) do
     t.string   "whodunnit"
     t.text     "object"
     t.datetime "created_at"
+    t.string   "custom_data"
   end
 
   add_index "versions", ["item_type", "item_id"], :name => "index_versions_on_item_type_and_item_id"