Example of a role based view resolver

Author: Lar Van Der Jagt

app/assets/stylesheets/application.css.sass

@@ -15,10 +15,17 @@ body
   background-color: $the_gray_area
   margin-top: 20px
 
-#content
+#content, nav
   background-color: $days_of_heaven
   margin: 0 auto
   width: 960px
 
-#items
+nav
+  text-align: center
+  margin-bottom: 20px
+  a
+    display: block
+    padding: 10px 0
+
+#items, #empty
   padding: 20px

app/controllers/admin/feed_controller.rb

@@ -2,6 +2,10 @@ module Admin
   class FeedController < ::ApplicationController
     append_view_path ItemsResolver.new(Item.subclass_names)
 
+    before_filter do
+      prepend_view_path RoleResolver.new(params[:role])
+    end
+
     expose(:things) { Item.all }
   end
 end

app/resolvers/role_resolver.rb

@@ -0,0 +1,13 @@
+class RoleResolver < ::ActionView::FileSystemResolver
+  attr_reader :role
+
+  def initialize(role)
+    @role = role
+    super("app/views")
+  end
+
+  def find_templates(name, prefix, partial, details)
+    prefix = [prefix, role].compact * '/'
+    super(name, prefix, partial, details)
+  end
+end

app/views/admin/feed/index.html.haml

@@ -1,2 +1,2 @@
-%ul#items
-  = render partial: things, as: :item
+#empty
+  Sorry, you can't view this page!

app/views/admin/feed/owner/index.html.haml

@@ -0,0 +1,2 @@
+%ul#items
+  = render partial: things, as: :item

app/views/application/_nav.html.haml

@@ -0,0 +1,2 @@
+%nav
+  = link_to 'Sign In', '/admin/owner'

app/views/application/owner/_nav.html.haml

@@ -0,0 +1,2 @@
+%nav
+  = link_to 'Sign Out', '/admin'

app/views/layouts/application.html.haml

@@ -10,5 +10,6 @@
       = javascript_include_tag 'html5'
   %body
     = render 'flashes'
+    = render 'nav'
     #content
       = yield

config/routes.rb

@@ -1,6 +1,7 @@
 ViewResolverExample::Application.routes.draw do
   match '/ui(/:action)', controller: 'ui'
   namespace :admin do
+    get '/:role', to: 'feed#index'
     root to: 'feed#index'
   end
   root to: 'feed#index'