Install paper_trail and track all models

Gemfile

@@ -16,6 +16,7 @@ gem 'simple_form'
 gem 'omniauth-reddit', :git => 'git://github.com/jackdempsey/omniauth-reddit.git'
 
 gem 'active_model_serializers'
+gem 'paper_trail'
 
 # AUTHORIZATION
 gem 'pundit'

Gemfile.lock

@@ -118,6 +118,10 @@ GEM
     omniauth-oauth2 (1.3.1)
       oauth2 (~> 1.0)
       omniauth (~> 1.2)
+    paper_trail (4.0.0)
+      activerecord (>= 3.0, < 6.0)
+      activesupport (>= 3.0, < 6.0)
+      request_store (~> 1.1)
     pg (0.18.3)
     puma (2.14.0)
     pundit (1.0.1)
@@ -163,6 +167,7 @@ GEM
       thor (>= 0.18.1, < 2.0)
     rake (10.4.2)
     rdoc (4.2.0)
+    request_store (1.2.0)
     rolify (4.1.1)
     ruby-graphviz (1.2.2)
     sass (3.4.18)
@@ -225,6 +230,7 @@ DEPENDENCIES
   jbuilder (~> 2.0)
   jquery-rails
   omniauth-reddit!
+  paper_trail
   pg
   puma
   pundit

app/models/awaken_type.rb

@@ -1,3 +1,5 @@
 class AwakenType < ActiveRecord::Base
+  has_paper_trail
+
   validates :name, presence: true
 end

app/models/card.rb

@@ -1,4 +1,6 @@
 class Card < ActiveRecord::Base
+  has_paper_trail
+
   belongs_to :character
   belongs_to :rarity
   belongs_to :type

app/models/character.rb

@@ -1,4 +1,6 @@
 class Character < ActiveRecord::Base
+  has_paper_trail
+
   validates :name, presence: true,
                    uniqueness: { case_sensitive: false }
 

app/models/leader_skill.rb

@@ -1,3 +1,5 @@
 class LeaderSkill < ActiveRecord::Base
+  has_paper_trail
+
   validates :description, presence: true
 end

app/models/link.rb

@@ -1,4 +1,6 @@
 class Link < ActiveRecord::Base
+  has_paper_trail
+
   has_and_belongs_to_many :cards
 
   validates :name, presence: true,

app/models/passive_skill.rb

@@ -1,4 +1,6 @@
 class PassiveSkill < ActiveRecord::Base
+  has_paper_trail
+
   validates :name, presence: true
   validates :description, presence: true
 

app/models/rarity.rb

@@ -1,4 +1,6 @@
 class Rarity < ActiveRecord::Base
+  has_paper_trail
+
   validates :name, presence: true,
                    uniqueness: { case_sensitive: false }
   validates :description, presence: true

app/models/super_attack.rb

@@ -1,4 +1,6 @@
 class SuperAttack < ActiveRecord::Base
+  has_paper_trail
+
   validates :name, presence: true
   validates :description, presence: true
 

app/models/type.rb

@@ -1,4 +1,6 @@
 class Type < ActiveRecord::Base
+  has_paper_trail
+
   validates :name, presence: true,
                    uniqueness: { case_sensitive: false }
   validates :description, presence: true

app/models/user.rb

@@ -1,4 +1,5 @@
 class User < ActiveRecord::Base
+  has_paper_trail
   rolify
 
   after_create :set_admin, if: :first_user?

db/migrate/20151009204428_create_versions.rb

@@ -0,0 +1,20 @@
+class CreateVersions < ActiveRecord::Migration
+
+  # The largest text column available in all supported RDBMS is
+  # 1024^3 - 1 bytes, roughly one gibibyte.  We specify a size
+  # so that MySQL will use `longtext` instead of `text`.  Otherwise,
+  # when serializing very large objects, `text` might not be big enough.
+  TEXT_BYTES = 1_073_741_823
+
+  def change
+    create_table :versions do |t|
+      t.string   :item_type, :null => false
+      t.integer  :item_id,   :null => false
+      t.string   :event,     :null => false
+      t.string   :whodunnit
+      t.text     :object,    :limit => TEXT_BYTES
+      t.datetime :created_at
+    end
+    add_index :versions, [:item_type, :item_id]
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20151008192100) do
+ActiveRecord::Schema.define(version: 20151009204428) do
 
   create_table "awaken_types", force: :cascade do |t|
     t.string   "name"
@@ -134,4 +134,15 @@ ActiveRecord::Schema.define(version: 20151008192100) do
 
   add_index "users_roles", ["user_id", "role_id"], name: "index_users_roles_on_user_id_and_role_id"
 
+  create_table "versions", force: :cascade do |t|
+    t.string   "item_type",                     null: false
+    t.integer  "item_id",                       null: false
+    t.string   "event",                         null: false
+    t.string   "whodunnit"
+    t.text     "object",     limit: 1073741823
+    t.datetime "created_at"
+  end
+
+  add_index "versions", ["item_type", "item_id"], name: "index_versions_on_item_type_and_item_id"
+
 end