Send emails to users who are watching topics

app/mailers/user_notifications.rb

@@ -76,5 +76,6 @@ class UserNotifications < ActionMailer::Base
   alias :user_replied :notification_template
   alias :user_quoted :notification_template
   alias :user_mentioned :notification_template
+  alias :user_posted :notification_template
 
 end

app/models/post_alert_observer.rb

@@ -85,6 +85,8 @@ class PostAlertObserver < ActiveRecord::Observer
 
       # Don't notify the same user about the same notification on the same post
       return if user.notifications.exists?(notification_type: type, topic_id: post.topic_id, post_number: post.post_number)
+
+      # Create the notification
       user.notifications.create(notification_type: type,
                                 topic_id: post.topic_id,
                                 post_number: post.post_number,

app/models/user_email_observer.rb

@@ -20,6 +20,15 @@ class UserEmailObserver < ActiveRecord::Observer
                    notification_id: notification.id)
   end
 
+  def email_user_posted(notification)
+    return unless notification.user.email_direct?
+    Jobs.enqueue_in(SiteSetting.email_time_window_mins.minutes,
+                   :user_email,
+                   type: :user_posted,
+                   user_id: notification.user_id,
+                   notification_id: notification.id)
+  end
+
   def email_user_quoted(notification)
     return unless notification.user.email_direct?
     Jobs.enqueue_in(SiteSetting.email_time_window_mins.minutes,

config/locales/server.en.yml

@@ -666,6 +666,16 @@ en:
         ---
         Please visit this link to respond: %{base_url}%{url}
 
+    user_posted:
+      subject_template: "[%{site_name}] %{username} posted in '%{topic_title}'"
+      text_body_template: |
+        %{username} posted in '%{topic_title}' on %{site_name}:
+
+        ---
+        %{message}
+
+        ---
+        Please visit this link to respond: %{base_url}%{url}
 
     digest:
       why: "Here's a brief summary of what happened on %{site_link} since we last saw you on %{last_seen_at}."

spec/models/user_email_observer_spec.rb

@@ -20,6 +20,24 @@ describe UserEmailObserver do
 
   end
 
+  context 'posted' do
+
+    let(:user) { Fabricate(:user) }
+    let!(:notification) { Fabricate(:notification, user: user) }
+
+    it "enqueues a job for the email" do
+      Jobs.expects(:enqueue_in).with(SiteSetting.email_time_window_mins.minutes, :user_email, type: :user_posted, user_id: notification.user_id, notification_id: notification.id)
+      UserEmailObserver.send(:new).email_user_posted(notification)
+    end
+
+    it "doesn't enqueue an email if the user has mention emails disabled" do
+      user.expects(:email_direct?).returns(false)
+      Jobs.expects(:enqueue_in).with(SiteSetting.email_time_window_mins.minutes, :user_email, has_entry(type: :user_posted)).never
+      UserEmailObserver.send(:new).email_user_posted(notification)
+    end
+
+  end
+
   context 'user_replied' do
 
     let(:user) { Fabricate(:user) }