notifications work now!

app/models/answer.rb

@@ -3,4 +3,8 @@ class Answer < ActiveRecord::Base
   belongs_to :question
   has_many :comments, dependent: :destroy
   has_many :smiles, dependent: :destroy
+
+  def notification_type(*_args)
+    Notifications::QuestionAnswered
+  end
 end

app/models/inbox.rb

@@ -6,6 +6,7 @@ class Inbox < ActiveRecord::Base
     answer = Answer.create!(content: answer,
                             user: user,
                             question: self.question)
+    Notification.notify self.question.user, answer
     user.increment! :answered_count
     self.question.increment! :answer_count
     self.destroy

app/models/notification.rb

@@ -1,2 +1,29 @@
 class Notification < ActiveRecord::Base
+  belongs_to :recipient, class_name: 'User'
+  belongs_to :target, :polymorphic => true
+
+  class << self
+    def for(recipient, options={})
+      self.where(options.merge!(recipient: recipient)).order(:updated_at).reverse_order
+    end
+
+    def notify(recipient, target)
+      return nil unless target.respond_to? :notification_type
+
+      notif_type = target.notification_type
+      return nil unless notif_type
+
+      make_notification(recipient, target, notif_type)
+    end
+
+    private
+
+      def make_notification(recipient, target, notification_type)
+        n = notification_type.new(target: target,
+                                  recipient: recipient,
+                                  new: true)
+        n.save!
+        n
+      end
+  end
 end

app/models/user.rb

@@ -21,6 +21,7 @@ class User < ActiveRecord::Base
   has_many :followers, through: :passive_relationships, source: :source
   has_many :smiles
   has_many :services
+  has_many :notifications, foreign_key: :recipient_id
 
   SCREEN_NAME_REGEX = /\A[a-zA-Z0-9_]{1,16}\z/
   WEBSITE_REGEX = /https?:\/\/([A-Za-z.\-]+)\/?(?:.*)/i

app/views/notifications/index.html.haml

@@ -2,6 +2,24 @@
   = render 'notification_tabs'
   .col-md-9.col-xs-12.col-sm-9
     %ul.list-group
+      - Notification.for(current_user).each do |notification|
+        %li.list-group-item
+          .media
+            .pull-left
+              %img.notification--img
+            .media-body
+              - case notification.target_type
+                - when "Answer"
+                  %h6.media-heading.notification--user
+                    = notification.target.user.screen_name
+                  %p.notification--text
+                    answered
+                    %a{href: show_user_answer_path(username: notification.target.user.screen_name, id: notification.target.id)}
+                      your question
+                    = time_ago_in_words notification.target.created_at
+                    ago
+                  .notification--icon
+                    %i.fa.fa-exclamation
       %li.list-group-item
         .media
           .pull-left