"followed you"

app/models/notifications/started_following.rb

@@ -0,0 +1,2 @@
+class Notifications::StartedFollowing < Notification
+end

app/models/relationship.rb

@@ -3,4 +3,8 @@ class Relationship < ActiveRecord::Base
   belongs_to :target, class_name: 'User'
   validates :source_id, presence: true
   validates :target_id, presence: true
+
+  def notification_type(*_args)
+    Notifications::StartedFollowing
+  end
 end

app/models/user.rb

@@ -56,7 +56,8 @@ class User < ActiveRecord::Base
 
   # follows an user.
   def follow(target_user)
-    active_relationships.create(target: target_user)
+    relationship = active_relationships.create(target: target_user)
+    Notification.notify target_user, relationship
 
     # increment counts
     increment! :friend_count

app/views/notifications/index.html.haml

@@ -5,13 +5,13 @@
       - Notification.for(current_user).each do |notification|
         %li.list-group-item
           .media
+            - case notification.target_type
+              - when "Answer"
                 .pull-left
                   %img.notification--img{src: gravatar_url(notification.target.user)}
                 .media-body
                   %h6.media-heading.notification--user
                     = user_screen_name notification.target.user
-              - case notification.target_type
-                - when "Answer"
                   %p.notification--text
                     answered
                     %a{href: show_user_answer_path(username: notification.target.user.screen_name, id: notification.target.id)}
@@ -20,13 +20,12 @@
                     ago
                   .notification--icon
                     %i.fa.fa-exclamation
-      %li.list-group-item
-        .media
+              - when "Relationship"
                 .pull-left
-            %img.notification--img
+                  %img.notification--img{src: gravatar_url(notification.target.source)}
                 .media-body
                   %h6.media-heading.notification--user
-              username
+                    = user_screen_name notification.target.source
                   %p.notification--text
                     followed you!
                   .notification--icon