made notification tabs work

app/controllers/notifications_controller.rb

@@ -3,5 +3,10 @@ class NotificationsController < ApplicationController
 
   def index
     @type = params[:type]
+    @notifications = if @type == 'all'
+                       Notification.for(current_user)
+                     else
+                       Notification.for(current_user).where('LOWER(target_type) = ?', @type)
+                     end
   end
 end

app/views/notifications/_notification_tabs.html.haml

@@ -2,8 +2,8 @@
   .panel.panel-default
     .panel-body
       %ul.nav.nav-pills.nav-stacked
-        = nav_entry "All notifications", ""
-        = nav_entry "Answers", ""
-        = nav_entry "Smiles", ""
-        = nav_entry "Comments", ""
-        = nav_entry "Followers", ""
+        = nav_entry "All notifications", notifications_path
+        = nav_entry "Answers", notifications_path('answer')
+        = nav_entry "Smiles", notifications_path('smile')
+        = nav_entry "Comments", notifications_path('comment')
+        = nav_entry "Followers", notifications_path('relationship')

app/views/notifications/index.html.haml

@@ -2,7 +2,7 @@
   = render 'notification_tabs'
   .col-md-9.col-xs-12.col-sm-9
     %ul.list-group
-      - Notification.for(current_user).each do |notification|
+      - @notifications.each do |notification|
         %li.list-group-item
           .media
             - case notification.target_type