add paper_trail, tag.body

Gemfile

@@ -119,3 +119,6 @@ gem 'validates_email_format_of'
 
 # Presentaion layer
 gem 'draper', '~> 1.3'
+
+# ActiveRecord versioning
+gem 'paper_trail', '~> 3.0.0'

Gemfile.lock

@@ -210,6 +210,9 @@ GEM
       oauth2 (~> 0.9.3)
       omniauth (~> 1.2)
     orm_adapter (0.5.0)
+    paper_trail (3.0.0)
+      activerecord (>= 3.0, < 5.0)
+      activesupport (>= 3.0, < 5.0)
     parser (2.1.5)
       ast (~> 1.1)
       slop (~> 3.4, >= 3.4.5)
@@ -372,6 +375,7 @@ DEPENDENCIES
   mysql2
   nokogiri
   omniauth-google-oauth2
+  paper_trail (~> 3.0.0)
   poltergeist
   premailer
   pry-rails

app/decorators/tag_decorator.rb

@@ -10,11 +10,17 @@ class TagDecorator < Draper::Decorator
   #     end
   #   end
 
+  # tagページのURL
+  # urlエンコードを施す
+  def show_path
+    h.show_tag_path(name: h.url_encode(model.name))
+  end
+
   # tagをtree viewで表示する
   def tree_view_node
     _html = ''
     _html += %Q{
-      <a href="#{ h.posts_path(q: '#' + model.name) }" data-name="#{model.name}">
+      <a href="#{ self.show_path }" data-name="#{model.name}">
         #{model.name} <span class="badge">#{model.posts.count}</span>
       </a>
     }

app/models/tag.rb

@@ -2,8 +2,12 @@ class Tag < ActiveRecord::Base
   has_many :post_tags
   has_many :posts, through: :post_tags
 
+  # for tree structure
   has_ancestry
 
+  # for versioning
+  has_paper_trail
+
   default_scope { order(:updated_at => :desc) }
 
   # 自分のタグに紐づくPostをすべて`other_tag`へ移動する

app/views/posts/_show_fragment.html.erb

@@ -10,7 +10,7 @@
       <%### Post meta ###%>
       <% @post.tags.each do |tag| %>
         <span class="label label-info">
-          <a href="<%= show_tag_path(name: url_encode(tag.name)) %>">#<%= tag.name %></a>
+          <a href="<%= tag.decorate.show_path %>">#<%= tag.name %></a>
         </span>
       <% end %>
       <span class="label label-success">

db/migrate/20140302053659_add_body_to_tag.rb

+class AddBodyToTag < ActiveRecord::Migration
+  def change
+    add_column :tags, :body, :text
+  end
+end

db/migrate/20140302053916_create_versions.rb

+class CreateVersions < ActiveRecord::Migration
+  def self.up
+    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
+      t.datetime :created_at
+    end
+    add_index :versions, [:item_type, :item_id]
+  end
+
+  def self.down
+    remove_index :versions, [:item_type, :item_id]
+    drop_table :versions
+  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: 20140106160129) do
+ActiveRecord::Schema.define(version: 20140302053916) do
 
   create_table "comments", force: true do |t|
     t.integer  "author_id"
@@ -47,6 +47,7 @@ ActiveRecord::Schema.define(version: 20140106160129) do
     t.datetime "created_at"
     t.datetime "updated_at"
     t.string   "ancestry"
+    t.text     "body"
   end
 
   add_index "tags", ["ancestry"], name: "index_tags_on_ancestry", using: :btree
@@ -74,4 +75,15 @@ ActiveRecord::Schema.define(version: 20140106160129) do
   add_index "users", ["email"], name: "index_users_on_email", unique: true, using: :btree
   add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true, using: :btree
 
+  create_table "versions", force: true 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"
+    t.datetime "created_at"
+  end
+
+  add_index "versions", ["item_type", "item_id"], name: "index_versions_on_item_type_and_item_id", using: :btree
+
 end