email updates

adding email update feature to forum threads. User can opt in to
receive email updates per thread. They can stop following threads too.

app/controllers/message_posts_controller.rb

@@ -17,6 +17,7 @@ def show
       redirect_to forum_message_post_url(@forum, @message_post.thread, :anchor => @message_post.id)
     else
       @child_posts = @message_post.child_posts.paginate :page => params[:page], :order => 'created_at ASC'
+      @followers = @message_post.followers 
       respond_to do |format|
         format.html # show.html.erb
         format.xml  { render :xml => @message_post }
@@ -53,7 +54,10 @@ def create
         flash[:notice] = "Posted: #{@message_post.subject}"
         format.html do
           if @message_post.thread
-               @message_post.thread.update_attribute(:updated_at, Time.now)
+              @message_post.thread.update_attribute(:updated_at, Time.now)
+              @message_post.thread.followers.each do |poster|
+                Notifier.email_follower( @message_post, poster).deliver
+              end
               redirect_to forum_message_post_url(@forum, @message_post.thread, :anchor => @message_post.id,
               :page => @message_post.thread.child_posts.last_page_number_for)
           else
@@ -99,7 +103,23 @@ def destroy
   end
 
 
-
+  # DELETE /forums/1/message_posts/1/stop_following
+  # DELETE /forums/1/message_posts/1.xml/stop_following
+  def stop_following
+    @message_post = MessagePost.find(params[:id]) #@forum.message_posts.find(params[:id])
+    posts = @message_post.posts_with_followers
+    posts.each do |post|
+      if post.user == current_user
+          post.update_attribute(:email_forum_activity, 0)
+      end
+    end
+    respond_to do |format|
+      flash[:notice] = "Stopped following Post '#{@message_post.subject}'."
+      format.html { redirect_to forum_message_post_url(@forum, @message_post.thread) }
+      format.xml  { head :ok }
+    end
+  end
+
   protected
   def get_forum
     @forum ||= Forum.find(params[:forum_id])

app/models/notifier.rb

@@ -39,4 +39,20 @@ def published_blog_post_updated(post, updating_user)
     @post_link = "Full Post: #{blog_post_url(post)}"
     @admin_link = "Blog Admin: #{blog_dashboard_url}"
   end
+
+  def email_follower(post, follower)
+    subject "[eFrog - #{post.thread.forum.title.truncate(23)}]  #{post.subject.truncate(23)}"
+    recipients follower.email
+    from     SiteSetting.read_setting('site email') || 'root'
+    content_type "text/html"
+    sent_on    Time.now
+
+    @follower   =   follower.full_name
+    @thread     =   post.thread
+    @post_title =   ActionController::Base.helpers.sanitize(post.subject)
+    @post_body  =   ActionController::Base.helpers.sanitize(post.body)
+    @forum      =   @thread.forum
+    @link       =   forum_message_post_url(@forum, @thread)
+  end
+
 end

app/models/user.rb

@@ -89,6 +89,10 @@ def forums
     @forums ||=  Forum.find(user_groups.map { |g| g.forums.keys }.flatten.uniq)
   end
 
+  def following_posts
+   return self.message_posts.find :all, :conditions=>'email_forum_activity = 1'
+  end
+
   def deliver_password_reset_instructions!
     # authlogic provides this:
     reset_perishable_token!

app/views/message_posts/_message_form.html.erb

@@ -1,10 +1,14 @@
+<% @followers ||= []%>
 <% if current_user -%>
   <div id="message_box">
     <% opts = message_post.new_record? ? { :url => forum_message_posts_path(@forum) } : { :url => forum_message_post_path(@forum, message_post), :method => :put } %>
     <%= form_for message_post, opts do |f| %>
       <%= f.error_messages %>
       <%= f.hidden_field(:forum_id) %>
       <%= f.hidden_field(:thread_id) %>
+      <%if( !message_post.new_record? || !@followers.include?(current_user) )%>
+     	 <p>Email updates to me: <%= f.check_box :email_forum_activity, :value => 1 %></p>
+      <%end%>
       <p>Subject: <%= f.text_field :subject %></p>
       <p><%= f.text_area :body, :cols => 60, :rows => 10 %></p>
       <p><%= submit_tag "Post it!" %></p>

app/views/message_posts/show.html.erb

@@ -31,7 +31,8 @@
 
 <h3>Reply to this thread:</h3>
 <%= render :partial => "message_form", 
-      :locals => { :message_post => MessagePost.new(:thread => @message_post, :subject => "RE: #{@message_post.subject}") } %>
+      :locals => { :message_post => MessagePost.new(:thread => @message_post, :subject => "RE: #{@message_post.subject}"), :followers => [@followers] } 
+%>
 
 
 <p class="small_text">
@@ -44,4 +45,12 @@
   <%= link_to 'delete this message thread', forum_message_post_path(@forum, @message_post), :method => :delete,
               :confirm => 'Are you sure you want to delete this thread and all the messages in it?' %>
 <% end %>
+<br />
+
+<h3>Following this Thread</h3>
+<ul>
+ <% for user in @followers -%>
+    <li><%= user.full_name%> <%if user == current_user%>(<%= link_to 'stop following', stop_following_forum_message_post_path(@forum, @message_post), :method => :post %>)<%end%></li>
+  <% end -%>
+</ul>
 

app/views/notifier/email_follower.erb

@@ -0,0 +1,12 @@
+A new post by <%= @follower%>
+<br><br>
+Full Thread: <%= @link %>
+<br><br>
+--------
+<%= @post_body %>
+--------
+<br><br>
+This message was sent to you because you signed up to receive email updates for new comments to <%=@thread.subject%> from the eFrog Forum <%=@forum.title%>.
+To stop receiving emails go to the <%= link_to('post', @link) %> and click on the 'stop following' link next to your name in the 'Following this Thread' section of the page.
+<br><br>
+This is an automated email. Do not respond.

config/routes.rb

@@ -88,6 +88,7 @@
     resources :message_posts do
       member do
         get "/:user_credentials/feed" => "message_posts#show", :as => :feed
+        post :stop_following
       end
     end
   end