Mark badge notification as read when the notification is clicked.

app/controllers/badges_controller.rb

@@ -16,6 +16,14 @@ class BadgesController < ApplicationController
   def show
     params.require(:id)
     badge = Badge.find(params[:id])
+
+    if current_user
+      user_badge = UserBadge.find_by(user_id: current_user.id, badge_id: badge.id)
+      if user_badge && user_badge.notification
+        user_badge.notification.update_attributes read: true
+      end
+    end
+
     serialized = MultiJson.dump(serialize_data(badge, BadgeSerializer, root: "badge"))
     respond_to do |format|
       format.html do

app/models/user_badge.rb

@@ -7,6 +7,12 @@ class UserBadge < ActiveRecord::Base
   validates :user_id, presence: true
   validates :granted_at, presence: true
   validates :granted_by, presence: true
+
+  # This may be inefficient, but not very easy to optimize unless the data hash
+  # is converted into a hstore.
+  def notification
+    @notification ||= self.user.notifications.where(notification_type: Notification.types[:granted_badge]).where("data LIKE ?", "%" + self.badge_id.to_s + "%").select {|n| n.data_hash["badge_id"] == self.badge_id }.first
+  end
 end
 
 # == Schema Information

app/services/badge_granter.rb

@@ -49,10 +49,7 @@ class BadgeGranter
         user_badge.user.save!
       end
 
-      # Delete notification -- This is inefficient, but not very easy to optimize
-      # unless the data hash is converted into a hstore.
-      notification = user_badge.user.notifications.where(notification_type: Notification.types[:granted_badge]).where("data LIKE ?", "%" + user_badge.badge_id.to_s + "%").select {|n| n.data_hash["badge_id"] == user_badge.badge_id }.first
-      notification && notification.destroy
+      user_badge.notification && user_badge.notification.destroy!
     end
   end
 

spec/controllers/badges_controller_spec.rb

@@ -2,6 +2,11 @@ require 'spec_helper'
 
 describe BadgesController do
   let!(:badge) { Fabricate(:badge) }
+  let(:user) { Fabricate(:user) }
+
+  before do
+    SiteSetting.enable_badges = true
+  end
 
   context 'index' do
     it 'should return a list of all badges' do
@@ -20,5 +25,13 @@ describe BadgesController do
       parsed = JSON.parse(response.body)
       parsed["badge"].should be_present
     end
+
+    it "should mark the notification as viewed" do
+      log_in_user(user)
+      user_badge = BadgeGranter.grant(badge, user)
+      user_badge.notification.read.should == false
+      get :show, id: badge.id, format: :json
+      user_badge.notification.reload.read.should == true
+    end
   end
 end