diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
new file mode 100644
index 0000000..1e92bc7
--- /dev/null
+++ b/app/controllers/api_controller.rb
@@ -0,0 +1,3 @@
+class ApiController < ActionController::Base
+  #問題 如果沒有繼承action controller，會有什麼影響嗎？
+end
diff --git a/app/controllers/api_v1/messages_controller.rb b/app/controllers/api_v1/messages_controller.rb
new file mode 100644
index 0000000..0e609ca
--- /dev/null
+++ b/app/controllers/api_v1/messages_controller.rb
@@ -0,0 +1,10 @@
+class ApiV1::MessagesController < ApiController
+
+ def index
+   @messages = Message.all
+ end
+
+
+
+
+end
diff --git a/app/controllers/likes_controller.rb b/app/controllers/likes_controller.rb
new file mode 100644
index 0000000..150b6eb
--- /dev/null
+++ b/app/controllers/likes_controller.rb
@@ -0,0 +1,30 @@
+class LikesController < ApplicationController
+
+  before_action :authenticate_user!
+  before_action :set_message
+
+  def create
+    like = @message.finy_like_by(user)
+    if like
+      # do nothing
+    else
+      @message.likes.create!( :user => user )
+    end
+
+    redirect_to :back
+  end
+
+  def destroy
+    @like = user.likes.find( params[:id] )
+    @like.destroy
+
+    redirect_to :back
+  end
+
+  protected
+
+  def set_message
+    @message = message.find( params[:message_id] )
+  end
+
+end
diff --git a/app/controllers/messages_controller.rb b/app/controllers/messages_controller.rb
index 96f65e5..95a3360 100644
--- a/app/controllers/messages_controller.rb
+++ b/app/controllers/messages_controller.rb
@@ -31,7 +31,7 @@ def new
 
   def create
     @message = Message.new( message_params )
-    @message.user = current_user
+    @message.user = user
 
     @message.save!
 
@@ -39,13 +39,13 @@ def create
   end
 
   def edit
-    @message = current_user.messages.find( params[:id] )
+    @message = user.messages.find( params[:id] )
 
     render "new"
   end
 
   def update
-    @message = current_user.messages.find( params[:id] )
+    @message = user.messages.find( params[:id] )
 
     @message.update!( message_params )
 
@@ -53,12 +53,34 @@ def update
   end
 
   def destroy
-    @message = current_user.messages.find( params[:id] )
+    @message = user.messages.find( params[:id] )
     @message.destroy
 
     redirect_to root_path
   end
 
+  def subscribe
+   @message = message.find( params[:id] )
+
+   subscription = @message.finy_subscription_by(user)
+   if subscription
+     # do nothing
+   else
+     @subscription = @message.subscriptions.create!( :user => user )
+   end
+
+   redirect_to :back
+ end
+
+ def unsubscribe
+   @message = message.find( params[:id] )
+
+   subscription = @message.finy_subscription_by(user)
+   subscription.destroy
+
+   redirect_to :back
+ end
+
   protected
 
   def message_params
diff --git a/app/models/like.rb b/app/models/like.rb
new file mode 100644
index 0000000..3fd5eaf
--- /dev/null
+++ b/app/models/like.rb
@@ -0,0 +1,4 @@
+class Like < ActiveRecord::Base
+  belongs_to :topic
+  belongs_to :user
+end
diff --git a/app/models/message.rb b/app/models/message.rb
index e24a8b2..e1846bf 100644
--- a/app/models/message.rb
+++ b/app/models/message.rb
@@ -1,11 +1,17 @@
 class Message < ActiveRecord::Base
 
   belongs_to :user
-
   has_many :comments, :dependent => :destroy
+  has_many :likes
+  has_many :likes_users, :through => :likes, :source => :user
+  has_many :subscriptions
+  has_many :subscribed_users, :through => :likes, :source => :user
 
   def last_comment_summary
     self.comments.last.try(:content).try(:truncate, 20)
   end
 
+  def finy_subscription_by(user)
+    self.subscriptions.find_by_user_id( user.id )
+  end
 end
diff --git a/app/models/subscription.rb b/app/models/subscription.rb
new file mode 100644
index 0000000..2da70f7
--- /dev/null
+++ b/app/models/subscription.rb
@@ -0,0 +1,6 @@
+class Subscription < ActiveRecord::Base
+
+  belongs_to :user
+  belongs_to :topic
+
+end
diff --git a/app/models/user.rb b/app/models/user.rb
index 6d01aa9..a696ef5 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -6,6 +6,10 @@ class User < ActiveRecord::Base
 
   has_many :messages
   has_many :comments
+  has_many :likes
+
+  has_many :subscriptions
+  has_many :subscribed_messages, :through => :likes, :source => :message
 
   def display_name
     self.email.split("@").first
diff --git a/app/models/user_message_ship.rb b/app/models/user_message_ship.rb
new file mode 100644
index 0000000..1da1520
--- /dev/null
+++ b/app/models/user_message_ship.rb
@@ -0,0 +1,3 @@
+class UserMessageShip < ActiveRecord::Base
+
+end
diff --git a/app/views/api_v1/messages/_message.json.jbuilder b/app/views/api_v1/messages/_message.json.jbuilder
new file mode 100644
index 0000000..77c960c
--- /dev/null
+++ b/app/views/api_v1/messages/_message.json.jbuilder
@@ -0,0 +1,8 @@
+json.message do
+  json.id message.id
+  json.status message.status
+  json.category_name message.category_name
+  json.title message.title
+  json.content message.content
+  json.created_at message.created_at
+end
diff --git a/app/views/api_v1/messages/index.json.jbuilder b/app/views/api_v1/messages/index.json.jbuilder
new file mode 100644
index 0000000..2ad5d68
--- /dev/null
+++ b/app/views/api_v1/messages/index.json.jbuilder
@@ -0,0 +1,5 @@
+json.results do
+  json.array!(@messages) do |m|
+    json.partial! 'message', message: m
+  end
+end
diff --git a/app/views/messages/show.html.erb b/app/views/messages/show.html.erb
index 41401f6..ca5e126 100644
--- a/app/views/messages/show.html.erb
+++ b/app/views/messages/show.html.erb
@@ -2,6 +2,22 @@
 
 <%= simple_format @message.content %>
 
+
+<h2>subscription list</h2>
+<ul>
+<% @message.subscriptions.each do |u| %>
+<li><%= u.user.email %></li>
+<% end %>
+</ul>
+
+
+<h2>like list</h2>
+<ul>
+<% @message.likes.each do |u| %>
+<li><%= u.user.email %></li>
+<% end %>
+</ul>
+
 <h2>Comments list</h2>
 
 <%= form_for [@message, @comment] do |f| %>
@@ -28,4 +44,3 @@
   </p>
 
 <% end %>
-
diff --git a/config/routes.rb b/config/routes.rb
index 74d4dbf..e2b00ff 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -5,6 +5,13 @@
     resources :comments
   end
 
+  scope :path => '/api/v1/', :module => "api_v1", :as => 'v1', :defaults => { :format => :json } do
+    resources :messages
+  end
+
+
+
+
   # The priority is based upon order of creation: first created -> highest priority.
   # See how all your routes lay out with "rake routes".
 
diff --git a/db/migrate/20160429091408_create_subscriptions.rb b/db/migrate/20160429091408_create_subscriptions.rb
new file mode 100644
index 0000000..d5b6c6f
--- /dev/null
+++ b/db/migrate/20160429091408_create_subscriptions.rb
@@ -0,0 +1,9 @@
+class CreateSubscriptions < ActiveRecord::Migration
+  def change
+    create_table :subscriptions do |t|
+      t.integer :user_id, :integer, :index => true
+      t.integer :message_id, :integer, :index => true
+      t.timestamps null: false
+    end
+  end
+end
diff --git a/db/migrate/20160429091414_create_likes.rb b/db/migrate/20160429091414_create_likes.rb
new file mode 100644
index 0000000..405be91
--- /dev/null
+++ b/db/migrate/20160429091414_create_likes.rb
@@ -0,0 +1,9 @@
+class CreateLikes < ActiveRecord::Migration
+  def change
+    create_table :likes do |t|
+      t.integer :user_id, :integer, :index => true
+      t.integer :message_id, :integer, :index => true
+      t.timestamps null: false
+    end
+  end
+end
diff --git a/db/migrate/20160429091553_create_user_message_ships.rb b/db/migrate/20160429091553_create_user_message_ships.rb
new file mode 100644
index 0000000..48c6f5e
--- /dev/null
+++ b/db/migrate/20160429091553_create_user_message_ships.rb
@@ -0,0 +1,9 @@
+class CreateUserMessageShips < ActiveRecord::Migration
+  def change
+    create_table :user_message_ships do |t|
+      t.integer :user_id, :integer, :index => true
+      t.integer :message_id, :integer, :index => true
+      t.timestamps null: false
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index ef7b5c0..16d62c9 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: 20150728165437) do
+ActiveRecord::Schema.define(version: 20160429091553) do
 
   create_table "comments", force: :cascade do |t|
     t.text     "content"
@@ -23,6 +23,17 @@
 
   add_index "comments", ["message_id"], name: "index_comments_on_message_id"
 
+  create_table "likes", force: :cascade do |t|
+    t.integer  "user_id"
+    t.integer  "integer"
+    t.integer  "message_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  add_index "likes", ["message_id"], name: "index_likes_on_message_id"
+  add_index "likes", ["user_id"], name: "index_likes_on_user_id"
+
   create_table "messages", force: :cascade do |t|
     t.string   "title"
     t.text     "content"
@@ -36,6 +47,28 @@
   add_index "messages", ["status"], name: "index_messages_on_status"
   add_index "messages", ["user_id"], name: "index_messages_on_user_id"
 
+  create_table "subscriptions", force: :cascade do |t|
+    t.integer  "user_id"
+    t.integer  "integer"
+    t.integer  "message_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  add_index "subscriptions", ["message_id"], name: "index_subscriptions_on_message_id"
+  add_index "subscriptions", ["user_id"], name: "index_subscriptions_on_user_id"
+
+  create_table "user_message_ships", force: :cascade do |t|
+    t.integer  "user_id"
+    t.integer  "integer"
+    t.integer  "message_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  add_index "user_message_ships", ["message_id"], name: "index_user_message_ships_on_message_id"
+  add_index "user_message_ships", ["user_id"], name: "index_user_message_ships_on_user_id"
+
   create_table "users", force: :cascade do |t|
     t.string   "email",                  default: "", null: false
     t.string   "encrypted_password",     default: "", null: false
diff --git a/lib/tasks/dev.rake b/lib/tasks/dev.rake
index 4673e72..752ecbb 100644
--- a/lib/tasks/dev.rake
+++ b/lib/tasks/dev.rake
@@ -16,7 +16,13 @@ namespace :dev do
                            :status => ["pending", "completed"].sample,
                            :content => Faker::Lorem.paragraph,
                            :user => users.sample,
-                           :created_at => Time.now - rand(30).days )
+                           :created_at => Time.now - rand(30).days
+                           )
+      2.times do
+        m.likes.create!(:user => users.sample)
+        m.subscriptions.create!(:user => users.sample)
+      end
+
       5.times do
         m.comments.create!( :content => Faker::Lorem.paragraph,
                             :user => users.sample )
@@ -24,4 +30,4 @@ namespace :dev do
     end
   end
 
-end
\ No newline at end of file
+end
diff --git a/spec/models/like_spec.rb b/spec/models/like_spec.rb
new file mode 100644
index 0000000..76ea93d
--- /dev/null
+++ b/spec/models/like_spec.rb
@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe Like, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end
diff --git a/spec/models/subscription_spec.rb b/spec/models/subscription_spec.rb
new file mode 100644
index 0000000..d40bf0b
--- /dev/null
+++ b/spec/models/subscription_spec.rb
@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe Subscription, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end
diff --git a/spec/models/user_message_ship_spec.rb b/spec/models/user_message_ship_spec.rb
new file mode 100644
index 0000000..8f7b550
--- /dev/null
+++ b/spec/models/user_message_ship_spec.rb
@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe UserMessageShip, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end