[style] Rubocop

app/controllers/ticket_purchases_controller.rb

@@ -16,7 +16,7 @@ class TicketPurchasesController < ApplicationController
     count_registration_tickets_after = current_user.count_registration_tickets(@conference)
 
     # Failed to create ticket purchase
-    if !message.blank?
+    unless message.blank?
       redirect_to conference_tickets_path(@conference.short_title),
                   error: "Oops, something went wrong with your purchase! #{message}"
       return

app/models/user.rb

@@ -348,15 +348,15 @@ class User < ApplicationRecord
 
   def count_registration_tickets(conference)
     count = 0
-    for ticket_purchase in ticket_purchases.by_conference(conference)
-      for physical_ticket in ticket_purchase.physical_tickets
+    ticket_purchases.by_conference(conference).each do |ticket_purchase|
+      ticket_purchase.physical_tickets.each do |physical_ticket|
         if physical_ticket.ticket.registration_ticket
           count += 1
         end
       end
     end
 
-    return count
+    count
   end
 
   def self.empty?