Unread notifications polling from the UI

Add notifications count route
Add JS notifications unread polling

Refs: diaspora#6473

app/assets/javascripts/app/views/notification_dropdown_view.js

@@ -16,6 +16,8 @@ app.views.NotificationDropdown = app.views.Base.extend({
     this.dropdownNotifications = this.dropdown.find(".notifications");
     this.ajaxLoader = this.dropdown.find(".ajax-loader");
     this.perfectScrollbarInitialized = false;
+    this.updateHeaderCounts();
+    setInterval(this.updateHeaderCounts, 30000);
   },
 
   toggleDropdown: function(evt){
@@ -105,6 +107,7 @@ app.views.NotificationDropdown = app.views.Base.extend({
         }
       });
     });
+    this.updateHeaderCounts();
 
     this.hideAjaxLoader();
 
@@ -131,6 +134,22 @@ app.views.NotificationDropdown = app.views.Base.extend({
       this.dropdownNotifications.perfectScrollbar("destroy");
       this.perfectScrollbarInitialized = false;
     }
+  },
+
+  updateHeaderCounts: function() {
+    $.getJSON(Routes.notificationsCounts(), function(data) {
+      var headerBadge = $(".notifications-link .badge"),
+        markAllReadLink = $("a#mark_all_read_link");
+      if (data.notifications > 0) {
+        headerBadge.html(parseInt(data.notifications));
+        headerBadge.removeClass("hidden");
+        markAllReadLink.removeClass("enabled");
+      } else {
+        headerBadge.addClass("hidden");
+        headerBadge.html(0);
+        markAllReadLink.removeClass("disabled");
+      }
+    });
   }
 });
 // @license-end

app/controllers/notifications_controller.rb

@@ -5,6 +5,8 @@
 class NotificationsController < ApplicationController
   before_action :authenticate_user!
 
+  respond_to :json, only: :counts
+
   def update
     note = Notification.where(:recipient_id => current_user.id, :id => params[:id]).first
     if note
@@ -78,4 +80,9 @@ def read_all
 
   end
 
+  def counts
+    render json: {
+      notifications: current_user.unread_notifications.count
+    }
+  end
 end

config/routes.rb

@@ -88,6 +88,7 @@
     end
   end
 
+  get "notifications/counts" => "notifications#counts"
 
   resources :tags, :only => [:index]
 

spec/controllers/notifications_controller_spec.rb

@@ -187,4 +187,19 @@
       expect(response).not_to be_redirect
     end
   end
+
+  describe "counts" do
+    it "succeeds" do
+      get :counts
+      expect(response).to be_success
+    end
+
+    it "returns unread notifications count" do
+      post = FactoryGirl.create(:status_message)
+      FactoryGirl.create(:notification, recipient: alice, target: post)
+      FactoryGirl.create(:notification, recipient: alice, target: post, unread: false)
+      get :counts
+      expect(response.body).to eq('{"notifications":1}')
+    end
+  end
 end