RailsConf: Presenters

app/controllers/users_controller.rb

@@ -47,18 +47,12 @@ def destroy
   end
 
   def following
-    @title = "Following"
-    @user = User.find(params[:id])
-    @users = @user.followed_users.paginate(page: params[:page])
-    @subtitle = "You Are Following #{@user.followed_users.size} Bloggers"
+    @presenter = Users::FollowedUsersPresenter.new(params[:id], params[:page])
     render 'show_follow'
   end
 
   def followers
-    @title = "Followers"
-    @user = User.find(params[:id])
-    @users = @user.followers.paginate(page: params[:page])
-    @subtitle = "Your Got #{@user.followers.size} Followers"
+    @presenter = Users::FollowersPresenter.new(params[:id], params[:page])
     render 'show_follow'
   end
 

app/presenters/users/follow_presenter.rb

@@ -0,0 +1,18 @@
+module Users
+  class FollowPresenter
+    include Draper::ViewHelpers
+
+    def initialize(user_id, page)
+      @user_id = user_id
+      @page    = page
+    end
+
+    def user
+      @user ||= User.find(@user_id)
+    end
+
+    def cache_key
+      [user, title]
+    end
+  end
+end

app/presenters/users/followed_users_presenter.rb

@@ -0,0 +1,15 @@
+module Users
+  class FollowedUsersPresenter < FollowPresenter
+    def users
+      @users ||= user.followed_users.paginate(page: @page)
+    end
+
+    def title
+      "Following"
+    end
+
+    def subtitle
+      @subtitle ||= "You Are Following #{h.pluralize(user.followed_users.size, "Blogger")}"
+    end
+  end
+end

app/presenters/users/followers_presenter.rb

@@ -0,0 +1,16 @@
+module Users
+  class FollowersPresenter < FollowPresenter
+    def users
+      @users ||= user.followers.paginate(page: @page)
+    end
+
+    def title
+      "Followers"
+    end
+
+    def subtitle
+      @subtitle ||= "Your Got #{h.pluralize(user.followers.size, "Followers")}"
+    end
+  end
+end
+

app/views/users/show_follow.html.erb

@@ -1,32 +1,32 @@
-<% provide(:title, @title) %>
+<% provide(:title, @presenter.title) %>
 
-<% cache [@user, @title] do %>
+<% cache @presenter.cache_key do %>
 <div class="row">
   <aside class="span4">
     <section>
-      <%= gravatar_for @user %>
-      <h1><%= @user.name %></h1>
-      <span><%= link_to "view my profile", @user %></span>
-      <span><b>Microposts:</b> <%= @user.microposts.count %></span>
+      <%= gravatar_for @presenter.user %>
+      <h1><%= @presenter.user.name %></h1>
+      <span><%= link_to "view my profile", @presenter.user %></span>
+      <span><b>Microposts:</b> <%= @presenter.user.microposts.count %></span>
     </section>
     <section>
       <%= render 'shared/stats' %>
-      <% if @users.any? %>
+      <% if @presenter.users.any? %>
         <div class="user_avatars">
-          <% @users.each do |user| %>
+          <% @presenter.users.each do |user| %>
             <%= link_to gravatar_for(user, size: 30), user %>
           <% end %>
         </div>
       <% end %>
     </section>
   </aside>
   <div class="span8">
-    <h3><%= @subtitle %></h3>
-    <% if @users.any? %>
+    <h3><%= @presenter.subtitle %></h3>
+    <% if @presenter.users.any? %>
       <ul class="users">
-        <%= render @users %>
+        <%= render @presenter.users %>
       </ul>
-      <%= will_paginate %>
+      <%= will_paginate @presenter.users %>
     <% end %>
   </div>
 </div>

config/application.rb

@@ -27,5 +27,9 @@ class Application < Rails::Application
         I18n.enforce_available_locales = true
 
         config.assets.precompile += %w(*.png *.jpg *.jpeg *.gif)
+
+        config.autoload_paths += %W(
+          #{config.root}/app/presenters
+        )
       end
     end