modify admin/conference_controller_spec and not authorized error messages

app/controllers/admin/base_controller.rb

@@ -10,7 +10,7 @@ module Admin
       unless (current_user.has_role? :organizer, :any) || (current_user.has_role? :cfp, :any) ||
              (current_user.has_role? :info_desk, :any) || (current_user.has_role? :organization_admin, :any) ||
              (current_user.has_role? :volunteers_coordinator, :any) || current_user.is_admin
-        raise CanCan::AccessDenied.new('You are not authorized to access this area!')
+        raise CanCan::AccessDenied.new('You are not authorized to access this page.')
       end
     end
   end

app/controllers/admin/conferences_controller.rb

@@ -72,11 +72,14 @@ module Admin
 
     def new
       @conference = Conference.new
+      @organizations = {}
+      Organization.all.each do |organization|
+        @organizations.store(organization.name, organization.id) if can? :create, Conference.new(organization: organization)
+      end
     end
 
     def create
       @conference = Conference.new(conference_params)
-      @conference.organization = Organization.find_or_create_by(name: 'organization')
       if @conference.save
         # user that creates the conference becomes organizer of that conference
         current_user.add_role :organizer, @conference