Email support for watching first post

app/mailers/user_notifications.rb

@@ -192,6 +192,10 @@ class UserNotifications < ActionMailer::Base
     notification_email(user, opts)
   end
 
+  def user_watching_first_post(user, opts)
+    user_posted(user, opts)
+  end
+
   def mailing_list_notify(user, post)
     opts = {
       post: post,

app/models/user_email_observer.rb

@@ -32,6 +32,10 @@ class UserEmailObserver < ActiveRecord::Observer
       enqueue :user_linked
     end
 
+    def watching_first_post
+      enqueue :user_watching_first_post
+    end
+
     def private_message
       enqueue_private(:user_private_message)
     end

config/locales/server.en.yml

@@ -2312,6 +2312,17 @@ en:
 
         %{respond_instructions}
 
+    user_watching_first_post:
+      subject_template: "[%{site_name}] %{topic_title}"
+      text_body_template: |
+        %{header_instructions}
+
+        %{message}
+
+        %{context}
+
+        %{respond_instructions}
+
     user_posted_pm:
       subject_template: "[%{site_name}] [PM] %{topic_title}"
       text_body_template: |

spec/mailers/user_notifications_spec.rb

@@ -482,6 +482,14 @@ describe UserNotifications do
     end
   end
 
+  describe "watching first post" do
+    include_examples "notification email building" do
+      let(:notification_type) { :invited_to_topic }
+      include_examples "no reply by email"
+      include_examples "sets user locale"
+    end
+  end
+
   # notification emails derived from templates are translated into the user's locale
   shared_examples "notification derived from template" do
     let(:user) { Fabricate(:user, locale: locale) }

spec/models/user_email_observer_spec.rb

@@ -8,7 +8,11 @@ describe UserEmailObserver do
   # something is off with fabricator
   def create_notification(type, user=nil)
     user ||= Fabricate(:user)
-    Notification.create(data: "{\"a\": 1}", user: user, notification_type: type, topic: topic, post_number: post.post_number)
+    Notification.create(data: "{\"a\": 1}",
+                        user: user,
+                        notification_type: Notification.types[type],
+                        topic: topic,
+                        post_number: post.post_number)
   end
 
   shared_examples "enqueue" do
@@ -82,7 +86,7 @@ describe UserEmailObserver do
   context 'user_mentioned' do
     let(:type) { :user_mentioned }
     let(:delay) { SiteSetting.email_time_window_mins.minutes }
-    let!(:notification) { create_notification(1) }
+    let!(:notification) { create_notification(:mentioned) }
 
     include_examples "enqueue_public"
 
@@ -97,7 +101,7 @@ describe UserEmailObserver do
   context 'user_replied' do
     let(:type) { :user_replied }
     let(:delay) { SiteSetting.email_time_window_mins.minutes }
-    let!(:notification) { create_notification(2) }
+    let!(:notification) { create_notification(:replied) }
 
     include_examples "enqueue_public"
   end
@@ -105,7 +109,7 @@ describe UserEmailObserver do
   context 'user_quoted' do
     let(:type) { :user_quoted }
     let(:delay) { SiteSetting.email_time_window_mins.minutes }
-    let!(:notification) { create_notification(3) }
+    let!(:notification) { create_notification(:quoted) }
 
     include_examples "enqueue_public"
   end
@@ -113,7 +117,7 @@ describe UserEmailObserver do
   context 'user_linked' do
     let(:type) { :user_linked }
     let(:delay) { SiteSetting.email_time_window_mins.minutes }
-    let!(:notification) { create_notification(11) }
+    let!(:notification) { create_notification(:linked) }
 
     include_examples "enqueue_public"
   end
@@ -121,7 +125,7 @@ describe UserEmailObserver do
   context 'user_posted' do
     let(:type) { :user_posted }
     let(:delay) { SiteSetting.email_time_window_mins.minutes }
-    let!(:notification) { create_notification(9) }
+    let!(:notification) { create_notification(:posted) }
 
     include_examples "enqueue_public"
   end
@@ -129,7 +133,7 @@ describe UserEmailObserver do
   context 'user_private_message' do
     let(:type) { :user_private_message }
     let(:delay) { SiteSetting.private_email_time_window_seconds }
-    let!(:notification) { create_notification(6) }
+    let!(:notification) { create_notification(:private_message) }
 
     include_examples "enqueue_private"
 
@@ -144,7 +148,7 @@ describe UserEmailObserver do
   context 'user_invited_to_private_message' do
     let(:type) { :user_invited_to_private_message }
     let(:delay) { SiteSetting.private_email_time_window_seconds }
-    let!(:notification) { create_notification(7) }
+    let!(:notification) { create_notification(:invited_to_private_message) }
 
     include_examples "enqueue_public"
   end
@@ -152,7 +156,15 @@ describe UserEmailObserver do
   context 'user_invited_to_topic' do
     let(:type) { :user_invited_to_topic }
     let(:delay) { SiteSetting.private_email_time_window_seconds }
-    let!(:notification) { create_notification(13) }
+    let!(:notification) { create_notification(:invited_to_topic) }
+
+    include_examples "enqueue_public"
+  end
+
+  context 'watching the first post' do
+    let(:type) { :user_watching_first_post }
+    let(:delay) { SiteSetting.email_time_window_mins.minutes }
+    let!(:notification) { create_notification(:watching_first_post) }
 
     include_examples "enqueue_public"
   end