Added current subcription UI.

app/controllers/currents_controller.rb

@@ -26,6 +26,33 @@ def page_title
     end
   end
 
+  def change_subscription(enabled)
+    @current = current_object
+    if enabled
+      @current.subscribers << current_user
+    else
+      @current.subscribers.delete current_user
+    end
+
+    respond_to do |format|
+      format.html do
+        flash[:info] = 'You are no longer subscribed to notifications of new ideas on this current.' if !enabled
+        redirect_to :action => 'show'
+      end
+      format.js do
+        render :partial => 'subscription'
+      end
+    end
+  end
+
+  def subscribe
+    change_subscription(true)
+  end
+
+  def unsubscribe
+    change_subscription(false)
+  end
+
   include ApplicationHelper
 
 end

app/models/user_mailer.rb

@@ -43,6 +43,7 @@ def idea_in_current_notification(user, idea)
     set_up_email(user)
     @body[:idea] = idea
     @body[:url] = idea_url(idea)
+    @body[:unsubscribe_url] = unsubscribe_current_url(idea.current)
     @subject += "New idea in current \"#{strip_funkies(idea.current.title)}\""
   end
 

app/views/currents/_subscription.html.haml

@@ -0,0 +1,13 @@
+-if logged_in?
+  %li.subscription
+    -if current_user.subscribed_currents.include?(@current)
+      You will receive email notifications for new ideas in this current.
+      = link_to_remote 'Stop watching',
+                       :url => unsubscribe_current_path(@current),
+                       :update => 'subscription',
+                       :complete => visual_effect(:highlight, 'subscription', :duration => 0.8)
+    -else
+      = link_to_remote 'Watch this current',
+                       :url => subscribe_current_path(@current),
+                       :update => 'subscription',
+                       :complete => visual_effect(:highlight, 'subscription', :duration => 0.8)

app/views/currents/show.html.haml

@@ -27,6 +27,8 @@
           %h3 About This Current
           %ul.entry-meta   
             %li.ideas= render :partial => 'idea_count', :locals => { :current_ideas => @current_ideas }
+            #subscription
+              = render :partial => 'subscription'
             %li.sharethis= render :partial => 'ideas/sharethis'
       .group.slate
         - if @current_ideas.empty?

app/views/ideas/_subscription.html.haml

@@ -1,5 +1,5 @@
 -if logged_in?
-  %li
+  %li.subscription
     -if @idea.inventor == current_user && current_user.notify_on_comments?
       You will receive email notifications for new comments on your idea.
       = link_to 'Account settings', edit_user_path

app/views/user_mailer/idea_in_current_notification.html.erb

@@ -5,4 +5,6 @@
 
 <%= h @idea.description %>
 
-<%= @url %>
+<%= @url %>
+
+To stop receiving these notifications: <%= @unsubscribe_url %>

test/functional/currents_controller_test.rb

@@ -89,5 +89,22 @@ def test_subscriber_notification_delivered_when_user_activated
     Delayed::Worker.new(:quiet => true).work_off
     assert_email_sent @sally, /ideas\/#{new_idea.id}/
   end
+
+  def test_subscribe
+    login_as @quentin
+    put :subscribe, :id => @walrus_attack_current.id
+    assert_redirected_to :action => :show
+    @walrus_attack_current.reload
+    assert_equal_unordered [@sally, @quentin], @walrus_attack_current.subscribers
+  end
+
+  def test_unsubscribe
+    login_as @sally
+    get :unsubscribe, :id => @walrus_attack_current.id
+    assert_redirected_to :action => :show
+    assert flash[:info] =~ /no longer subscribed/
+    @walrus_attack_current.reload
+    assert_equal [], @walrus_attack_current.subscribers
+  end
 
 end