From f7adce658ef8865aa4afd48d44c690a33a4b6c1a Mon Sep 17 00:00:00 2001
From: Andrew Tomaka <atomaka@gmail.com>
Date: Fri, 9 Oct 2015 16:45:53 -0400
Subject: [PATCH 1/4] Install paper_trail and track all models

---
 Gemfile                                      |  1 +
 Gemfile.lock                                 |  6 ++++++
 app/models/awaken_type.rb                    |  2 ++
 app/models/card.rb                           |  2 ++
 app/models/character.rb                      |  2 ++
 app/models/leader_skill.rb                   |  2 ++
 app/models/link.rb                           |  2 ++
 app/models/passive_skill.rb                  |  2 ++
 app/models/rarity.rb                         |  2 ++
 app/models/super_attack.rb                   |  2 ++
 app/models/type.rb                           |  2 ++
 app/models/user.rb                           |  1 +
 db/migrate/20151009204428_create_versions.rb | 20 ++++++++++++++++++++
 db/schema.rb                                 | 13 ++++++++++++-
 14 files changed, 58 insertions(+), 1 deletion(-)
 create mode 100644 db/migrate/20151009204428_create_versions.rb

diff --git a/Gemfile b/Gemfile
index cc61952..280e850 100644
--- a/Gemfile
+++ b/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'
diff --git a/Gemfile.lock b/Gemfile.lock
index ef35c8a..6622a0d 100644
--- a/Gemfile.lock
+++ b/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
diff --git a/app/models/awaken_type.rb b/app/models/awaken_type.rb
index 7862d09..3caf9cd 100644
--- a/app/models/awaken_type.rb
+++ b/app/models/awaken_type.rb
@@ -1,3 +1,5 @@
 class AwakenType < ActiveRecord::Base
+  has_paper_trail
+
   validates :name, presence: true
 end
diff --git a/app/models/card.rb b/app/models/card.rb
index 1791328..a69e539 100644
--- a/app/models/card.rb
+++ b/app/models/card.rb
@@ -1,4 +1,6 @@
 class Card < ActiveRecord::Base
+  has_paper_trail
+
   belongs_to :character
   belongs_to :rarity
   belongs_to :type
diff --git a/app/models/character.rb b/app/models/character.rb
index 2f5c3d1..10142fc 100644
--- a/app/models/character.rb
+++ b/app/models/character.rb
@@ -1,4 +1,6 @@
 class Character < ActiveRecord::Base
+  has_paper_trail
+
   validates :name, presence: true,
                    uniqueness: { case_sensitive: false }
 
diff --git a/app/models/leader_skill.rb b/app/models/leader_skill.rb
index 36e8a22..3a493af 100644
--- a/app/models/leader_skill.rb
+++ b/app/models/leader_skill.rb
@@ -1,3 +1,5 @@
 class LeaderSkill < ActiveRecord::Base
+  has_paper_trail
+
   validates :description, presence: true
 end
diff --git a/app/models/link.rb b/app/models/link.rb
index 78cbc00..a3b5b50 100644
--- a/app/models/link.rb
+++ b/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,
diff --git a/app/models/passive_skill.rb b/app/models/passive_skill.rb
index 3a73da0..6eebdbc 100644
--- a/app/models/passive_skill.rb
+++ b/app/models/passive_skill.rb
@@ -1,4 +1,6 @@
 class PassiveSkill < ActiveRecord::Base
+  has_paper_trail
+
   validates :name, presence: true
   validates :description, presence: true
 
diff --git a/app/models/rarity.rb b/app/models/rarity.rb
index 39e9d46..bfe10ed 100644
--- a/app/models/rarity.rb
+++ b/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
diff --git a/app/models/super_attack.rb b/app/models/super_attack.rb
index b8cda47..332c480 100644
--- a/app/models/super_attack.rb
+++ b/app/models/super_attack.rb
@@ -1,4 +1,6 @@
 class SuperAttack < ActiveRecord::Base
+  has_paper_trail
+
   validates :name, presence: true
   validates :description, presence: true
 
diff --git a/app/models/type.rb b/app/models/type.rb
index bfc271d..a88c3e6 100644
--- a/app/models/type.rb
+++ b/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
diff --git a/app/models/user.rb b/app/models/user.rb
index d185b02..e80109e 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1,4 +1,5 @@
 class User < ActiveRecord::Base
+  has_paper_trail
   rolify
 
   after_create :set_admin, if: :first_user?
diff --git a/db/migrate/20151009204428_create_versions.rb b/db/migrate/20151009204428_create_versions.rb
new file mode 100644
index 0000000..3876dfc
--- /dev/null
+++ b/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
diff --git a/db/schema.rb b/db/schema.rb
index 8bd23fe..81bdf6a 100644
--- a/db/schema.rb
+++ b/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

From 73d5f3635763239bb2178b23a88d80a715619d26 Mon Sep 17 00:00:00 2001
From: Andrew Tomaka <atomaka@gmail.com>
Date: Tue, 13 Oct 2015 16:38:33 -0400
Subject: [PATCH 2/4] Add listing and showing of old versions

---
 app/assets/javascripts/admin/versions.coffee |  3 ++
 app/assets/stylesheets/admin/versions.scss   |  3 ++
 app/controllers/admin/cards_controller.rb    |  2 +
 app/controllers/admin/versions_controller.rb | 16 ++++++++
 app/helpers/admin/versions_helper.rb         |  2 +
 app/views/admin/cards/edit.html.slim         |  2 +
 app/views/admin/cards/show.html.slim         | 42 ++++++++++++++++++++
 app/views/admin/versions/_list.html.slim     | 16 ++++++++
 app/views/admin/versions/show.html.slim      |  0
 config/routes.rb                             |  1 +
 10 files changed, 87 insertions(+)
 create mode 100644 app/assets/javascripts/admin/versions.coffee
 create mode 100644 app/assets/stylesheets/admin/versions.scss
 create mode 100644 app/controllers/admin/versions_controller.rb
 create mode 100644 app/helpers/admin/versions_helper.rb
 create mode 100644 app/views/admin/cards/show.html.slim
 create mode 100644 app/views/admin/versions/_list.html.slim
 create mode 100644 app/views/admin/versions/show.html.slim

diff --git a/app/assets/javascripts/admin/versions.coffee b/app/assets/javascripts/admin/versions.coffee
new file mode 100644
index 0000000..24f83d1
--- /dev/null
+++ b/app/assets/javascripts/admin/versions.coffee
@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/
diff --git a/app/assets/stylesheets/admin/versions.scss b/app/assets/stylesheets/admin/versions.scss
new file mode 100644
index 0000000..222d135
--- /dev/null
+++ b/app/assets/stylesheets/admin/versions.scss
@@ -0,0 +1,3 @@
+// Place all the styles related to the Admin::Versions controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/
diff --git a/app/controllers/admin/cards_controller.rb b/app/controllers/admin/cards_controller.rb
index ce1de73..eb20739 100644
--- a/app/controllers/admin/cards_controller.rb
+++ b/app/controllers/admin/cards_controller.rb
@@ -32,6 +32,8 @@ class Admin::CardsController < Admin::BaseController
 
   def edit
     authorize @card
+
+    @versions = @card.versions
   end
 
   def update
diff --git a/app/controllers/admin/versions_controller.rb b/app/controllers/admin/versions_controller.rb
new file mode 100644
index 0000000..83ec1c9
--- /dev/null
+++ b/app/controllers/admin/versions_controller.rb
@@ -0,0 +1,16 @@
+class Admin::VersionsController < Admin::BaseController
+  before_action :set_version, only: [:show]
+
+  def show
+    type = @version.class.to_s.underscore
+    instance_variable_set('@' + type, @version)
+
+    render "admin/#{type.pluralize}/show"
+  end
+
+  private
+
+  def set_version
+    @version = PaperTrail::Version.find(params[:id]).reify
+  end
+end
diff --git a/app/helpers/admin/versions_helper.rb b/app/helpers/admin/versions_helper.rb
new file mode 100644
index 0000000..40b273c
--- /dev/null
+++ b/app/helpers/admin/versions_helper.rb
@@ -0,0 +1,2 @@
+module Admin::VersionsHelper
+end
diff --git a/app/views/admin/cards/edit.html.slim b/app/views/admin/cards/edit.html.slim
index fbedb45..9312321 100644
--- a/app/views/admin/cards/edit.html.slim
+++ b/app/views/admin/cards/edit.html.slim
@@ -1 +1,3 @@
 == render 'form'
+
+== render 'admin/versions/list', versions: @versions
diff --git a/app/views/admin/cards/show.html.slim b/app/views/admin/cards/show.html.slim
new file mode 100644
index 0000000..9708e90
--- /dev/null
+++ b/app/views/admin/cards/show.html.slim
@@ -0,0 +1,42 @@
+.row
+  .col-md-4
+    strong Game ID Number: 
+    = @card.gameid
+  .col-md-4
+    strong Title: 
+    = @card.title
+  .col-md-4
+    strong Character: 
+    = @card.character.name
+.row
+  .col-md-4
+    strong Rarity: 
+    = @card.rarity.name
+  .col-md-4
+    strong Type: 
+    = @card.type.name
+  .col-md-4
+    strong Awaken Type: 
+    = @card.awaken_type.name
+.row
+  .col-md-6
+    strong Leader Skill: 
+    = @card.leader_skill.description
+  .col-md-6
+    strong Passive Skill: 
+    = @card.passive_skill.name
+.row
+  .col-md-12
+    strong Super Attack: 
+    = "#{@card.super_attack.name} - #{@card.super_attack.description}"
+.row
+  .col-md-6
+    strong Dokkan Card: 
+    - if @card.dokkan_card
+      = @card.dokkan_card.full_name
+.row
+  .col-md-12
+    strong Links: 
+    ul
+    - @card.links.each do |link|
+      li= link.name
diff --git a/app/views/admin/versions/_list.html.slim b/app/views/admin/versions/_list.html.slim
new file mode 100644
index 0000000..803b0cf
--- /dev/null
+++ b/app/views/admin/versions/_list.html.slim
@@ -0,0 +1,16 @@
+.row
+  .col-md-12
+    table.table.table-striped.table-hover
+      thead
+        tr
+          th ID
+          th Event
+          th Date
+          th Modified By
+      tbody
+        - versions.each do |version|
+          tr
+            td= link_to version.id, admin_version_path(version)
+            td= version.event
+            td= version.created_at
+            td= User.find(version.version_author).nickname
diff --git a/app/views/admin/versions/show.html.slim b/app/views/admin/versions/show.html.slim
new file mode 100644
index 0000000..e69de29
diff --git a/config/routes.rb b/config/routes.rb
index be64e71..7b91c03 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -22,6 +22,7 @@ Rails.application.routes.draw do
     resources :super_attacks
     resources :types
     resources :users, except: [:new, :create]
+    resources :versions, only: [:show]
   end
 
   namespace :api do

From dc55fc10f1961dd1cbcda328dbecac557e6f0f4d Mon Sep 17 00:00:00 2001
From: Andrew Tomaka <atomaka@gmail.com>
Date: Wed, 14 Oct 2015 08:45:24 -0400
Subject: [PATCH 3/4] Support associations (no has_and_belongs_to)

---
 app/controllers/admin/versions_controller.rb  |  2 +-
 ...51014121823_create_version_associations.rb | 17 +++++++++++++++
 ...4_add_transaction_id_column_to_versions.rb | 11 ++++++++++
 db/schema.rb                                  | 21 ++++++++++++++-----
 4 files changed, 45 insertions(+), 6 deletions(-)
 create mode 100644 db/migrate/20151014121823_create_version_associations.rb
 create mode 100644 db/migrate/20151014121824_add_transaction_id_column_to_versions.rb

diff --git a/app/controllers/admin/versions_controller.rb b/app/controllers/admin/versions_controller.rb
index 83ec1c9..d16a86d 100644
--- a/app/controllers/admin/versions_controller.rb
+++ b/app/controllers/admin/versions_controller.rb
@@ -11,6 +11,6 @@ class Admin::VersionsController < Admin::BaseController
   private
 
   def set_version
-    @version = PaperTrail::Version.find(params[:id]).reify
+    @version = PaperTrail::Version.find(params[:id]).reify(has_one: true)
   end
 end
diff --git a/db/migrate/20151014121823_create_version_associations.rb b/db/migrate/20151014121823_create_version_associations.rb
new file mode 100644
index 0000000..12c8f06
--- /dev/null
+++ b/db/migrate/20151014121823_create_version_associations.rb
@@ -0,0 +1,17 @@
+class CreateVersionAssociations < ActiveRecord::Migration
+  def self.up
+    create_table :version_associations do |t|
+      t.integer  :version_id
+      t.string   :foreign_key_name, :null => false
+      t.integer  :foreign_key_id
+    end
+    add_index :version_associations, [:version_id]
+    add_index :version_associations, [:foreign_key_name, :foreign_key_id], :name => 'index_version_associations_on_foreign_key'
+  end
+
+  def self.down
+    remove_index :version_associations, [:version_id]
+    remove_index :version_associations, :name => 'index_version_associations_on_foreign_key'
+    drop_table :version_associations
+  end
+end
\ No newline at end of file
diff --git a/db/migrate/20151014121824_add_transaction_id_column_to_versions.rb b/db/migrate/20151014121824_add_transaction_id_column_to_versions.rb
new file mode 100644
index 0000000..67e0e22
--- /dev/null
+++ b/db/migrate/20151014121824_add_transaction_id_column_to_versions.rb
@@ -0,0 +1,11 @@
+class AddTransactionIdColumnToVersions < ActiveRecord::Migration
+  def self.up
+    add_column :versions, :transaction_id, :integer
+    add_index :versions, [:transaction_id]
+  end
+
+  def self.down
+    remove_index :versions, [:transaction_id]
+    remove_column :versions, :transaction_id
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 81bdf6a..33c88fa 100644
--- a/db/schema.rb
+++ b/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: 20151009204428) do
+ActiveRecord::Schema.define(version: 20151014121824) do
 
   create_table "awaken_types", force: :cascade do |t|
     t.string   "name"
@@ -134,15 +134,26 @@ ActiveRecord::Schema.define(version: 20151009204428) do
 
   add_index "users_roles", ["user_id", "role_id"], name: "index_users_roles_on_user_id_and_role_id"
 
+  create_table "version_associations", force: :cascade do |t|
+    t.integer "version_id"
+    t.string  "foreign_key_name", null: false
+    t.integer "foreign_key_id"
+  end
+
+  add_index "version_associations", ["foreign_key_name", "foreign_key_id"], name: "index_version_associations_on_foreign_key"
+  add_index "version_associations", ["version_id"], name: "index_version_associations_on_version_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   "item_type",                         null: false
+    t.integer  "item_id",                           null: false
+    t.string   "event",                             null: false
     t.string   "whodunnit"
-    t.text     "object",     limit: 1073741823
+    t.text     "object",         limit: 1073741823
     t.datetime "created_at"
+    t.integer  "transaction_id"
   end
 
   add_index "versions", ["item_type", "item_id"], name: "index_versions_on_item_type_and_item_id"
+  add_index "versions", ["transaction_id"], name: "index_versions_on_transaction_id"
 
 end

From dfa4ffeaeacaf92aac42f11d4272e234036c1500 Mon Sep 17 00:00:00 2001
From: Andrew Tomaka <atomaka@gmail.com>
Date: Wed, 14 Oct 2015 09:21:16 -0400
Subject: [PATCH 4/4] Implement undoing

---
 app/controllers/admin/base_controller.rb       |  8 ++++++++
 app/controllers/admin/cards_controller.rb      |  9 ++++++---
 app/controllers/admin/versions_controller.rb   | 17 ++++++++++++++---
 app/views/application/_flash_message.html.slim |  2 +-
 config/routes.rb                               |  2 ++
 5 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/app/controllers/admin/base_controller.rb b/app/controllers/admin/base_controller.rb
index 807fd9a..67c01ad 100644
--- a/app/controllers/admin/base_controller.rb
+++ b/app/controllers/admin/base_controller.rb
@@ -1,3 +1,11 @@
 class Admin::BaseController < ApplicationController
   layout 'admin'
+
+  private
+
+  def undo_link(item)
+    view_context.link_to('Undo this change',
+                         admin_revert_version_path(id: item.version.last),
+                         method: :post)
+  end
 end
diff --git a/app/controllers/admin/cards_controller.rb b/app/controllers/admin/cards_controller.rb
index eb20739..882a488 100644
--- a/app/controllers/admin/cards_controller.rb
+++ b/app/controllers/admin/cards_controller.rb
@@ -24,7 +24,8 @@ class Admin::CardsController < Admin::BaseController
     authorize @card
 
     if @card.save
-      redirect_to admin_cards_path, notice: 'Card was created'
+      redirect_to admin_cards_path,
+        notice: "Card was created. #{undo_link(@card)}"
     else
       render :new
     end
@@ -40,7 +41,8 @@ class Admin::CardsController < Admin::BaseController
     authorize @card
 
     if @card.update(card_params)
-      redirect_to admin_cards_path, notice: 'Card was updated'
+      redirect_to admin_cards_path,
+        notice: "Card was updated. #{undo_link(@card)}"
     else
       render :edit
     end
@@ -51,7 +53,8 @@ class Admin::CardsController < Admin::BaseController
 
     @card.destroy
 
-    redirect_to admin_cards_path, notice: 'Card was deleted'
+    redirect_to admin_cards_path,
+      notice: "Card was deleted. #{undo_link(@card)}"
   end
 
   private
diff --git a/app/controllers/admin/versions_controller.rb b/app/controllers/admin/versions_controller.rb
index d16a86d..af99796 100644
--- a/app/controllers/admin/versions_controller.rb
+++ b/app/controllers/admin/versions_controller.rb
@@ -1,16 +1,27 @@
 class Admin::VersionsController < Admin::BaseController
-  before_action :set_version, only: [:show]
-
   def show
+    @version = PaperTrail::Version.find(params[:id]).reify(has_one: true)
+
     type = @version.class.to_s.underscore
     instance_variable_set('@' + type, @version)
 
     render "admin/#{type.pluralize}/show"
   end
 
+  def revert
+    @version = PaperTrail::Version.find(params[:id])
+
+    if @version.reify(has_one: true)
+      @version.reify(has_one: true).save!
+    else
+      @version.item.destroy
+    end
+
+    redirect_to :back, notice: "Undid #{@version.event}!"
+  end
+
   private
 
   def set_version
-    @version = PaperTrail::Version.find(params[:id]).reify(has_one: true)
   end
 end
diff --git a/app/views/application/_flash_message.html.slim b/app/views/application/_flash_message.html.slim
index e604085..5e45690 100644
--- a/app/views/application/_flash_message.html.slim
+++ b/app/views/application/_flash_message.html.slim
@@ -2,4 +2,4 @@
   button.close type='button' data-dismiss='alert'
     span aria-hidden='true' &times;
     span.sr-only Close
-  = message
+  = raw(message)
diff --git a/config/routes.rb b/config/routes.rb
index 7b91c03..5151a74 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -12,6 +12,8 @@ Rails.application.routes.draw do
 
     get '/dashboard', to: 'dashboard#index'
 
+    post '/versions/revert', to: 'versions#revert', as: 'revert_version'
+
     resources :awaken_types
     resources :cards
     resources :characters