Added check for payment date in ability.tb

app/controllers/payments_controller.rb

@@ -1,6 +1,6 @@
 class PaymentsController < ApplicationController
   before_action :authenticate_user!
-  load_and_authorize_resource
+  load_and_authorize_resource except: :new
   load_resource :conference, find_by: :short_title
   authorize_resource :conference_registrations, class: Registration
 
@@ -9,10 +9,8 @@ class PaymentsController < ApplicationController
   end
 
   def new
+    authorize! :new, Payment.new(conference_id: @conference.id)
     @total_amount_to_pay = Ticket.total_price(@conference, current_user, paid: false)
-    if @conference.end_date < Date.today
-      raise CanCan::AccessDenied.new("This conference has ended on #{@conference.end_date}!", :new, Payment)
-    end
     if @total_amount_to_pay.zero?
       raise CanCan::AccessDenied.new('Nothing to pay for!', :new, Payment)
     end

app/models/ability.rb

@@ -73,6 +73,11 @@ class Ability
     can :index, Ticket
     can :manage, TicketPurchase, user_id: user.id
     can [:new, :create], Payment, user_id: user.id
+
+    can :new, Payment do |payment|
+      payment.conference.end_date >= Date.today
+    end
+
     can [:index, :show], PhysicalTicket, user: user
 
     can [:new, :create], Booth do |booth|