created comments with FactoryGirl

app/models/ability.rb

@@ -137,7 +137,9 @@ class Ability
     can :manage, Sponsor, conference_id: conf_ids_for_organizer
     can :manage, SponsorshipLevel, conference_id: conf_ids_for_organizer
     can :manage, Ticket, conference_id: conf_ids_for_organizer
-    can :manage, Comment, conference_id: conf_ids_for_organizer
+    can [:read, :create], Comment, commentable_type: 'Event',
+        commentable_id: Event.where(conference_id: conf_ids_for_organizer).pluck(:id)
+
   end
 
   def signed_in_with_cfp_role(user)
@@ -156,7 +158,8 @@ class Ability
     can :manage, CallForPaper, conference_id: conf_ids_for_cfp
     can :manage, Commercial, commercialable_type: 'Event',
                              commercialable_id: Event.where(conference_id: conf_ids_for_cfp).pluck(:id)
-    can :manage, Comment, conference_id: conf_ids_for_cfp
+    can [:read, :create], Comment, commentable_type: 'Event',
+                                   commentable_id: Event.where(conference_id: conf_ids_for_cfp).pluck(:id)
   end
 
   def signed_in_with_info_desk_role(user)

app/views/layouts/_navigation.html.haml

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

spec/factories/comments.rb

@@ -0,0 +1,9 @@
+# Read about factories at https://github.com/thoughtbot/factory_girl
+
+FactoryGirl.define do
+  factory :comment do
+    body 'Most interresting comment ever, created by a girl.'
+    user
+    association :commentable, factory: :event
+  end
+end

spec/factories/events.rb

@@ -47,6 +47,7 @@ FactoryGirl.define do
         event.difficulty_level = build(:difficulty_level, conference: event.conference)
         event.track = build(:track, conference: event.conference)
         event.room = build(:room, conference: event.conference)
+        event.comment_threads << build(:comment, commentable: event)
       end
     end
 

spec/models/ability_spec.rb

@@ -141,6 +141,7 @@ describe 'User' do
       it{ should_not be_able_to(:manage, other_event.difficulty_level) }
       it{ should be_able_to(:manage, event.commercials.first) }
       it{ should_not be_able_to(:manage, other_event.commercials.first) }
+      it{ should be_able_to([:read, :create], event.comment_threads.first) }
     end
 
     context 'when user has the role cfp' do