changed #signed_in_with_roles(user) in ability.rb model

app/controllers/admin/comments_controller.rb

@@ -1,7 +1,9 @@
 module Admin
   class CommentsController < Admin::BaseController
+    load_and_authorize_resource :conference, find_by: :short_title
     load_and_authorize_resource
 
+
     def index
       @ordered_events = Event.order(:title).all
     end

app/helpers/application_helper.rb

@@ -263,10 +263,6 @@ module ApplicationHelper
     end
   end
 
-  def can_manage_comments(conference)
-    (current_user.has_role? :organizer, conference) || (current_user.has_role? :cfp, conference)
-  end
-
   def sign_in_path
     if CONFIG['authentication']['ichain']['enabled']
       new_user_ichain_session_path

app/models/ability.rb

@@ -88,10 +88,10 @@ class Ability
     # Abilities from not_signed_in and signed_in are also inherited
     signed_in(user)
 
-    signed_in_with_organizer_role(user)
-    signed_in_with_cfp_role(user)
-    signed_in_with_info_desk_role(user)
-    signed_in_with_volunteers_coordinator_role(user)
+    signed_in_with_organizer_role(user) if user.has_role? :organizer, :any
+    signed_in_with_cfp_role(user) if user.has_role? :cfp, :any
+    signed_in_with_info_desk_role(user) if user.has_role? :info_desk, :any
+    signed_in_with_volunteers_coordinator_role(user) if user.has_role? :volunteer_coordinator, :any
 
     # for users with any role
     can [:show], Conference

app/views/layouts/_navigation.html.haml

@@ -25,7 +25,7 @@
                 %b.caret
               %ul.dropdown-menu
                 = render 'layouts/user_menu'
-          - if can_manage_comments(@conference)
+          - if can? :index, Comment
             %ul.nav.navbar-nav.navbar-right
               %li.dropdown
                 %a.dropdown-toggle{"data-toggle" => "dropdown", :href => "#", id: "unread-comments-preview"}