style: correct coding style with rubocop linter

app/models/event.rb

@@ -48,5 +48,4 @@ class Event < ApplicationRecord
 
   # Scope for published events ordered by start time
   scope :upcoming, -> { published.where("start_time >= ?", Time.current).order(start_time: :asc) }
-
 end

app/models/order.rb

@@ -90,4 +90,4 @@ class Order < ApplicationRecord
   def draft?
     status == "draft"
   end
-end
+end

app/models/ticket_type.rb

@@ -12,7 +12,7 @@ class TicketType < ApplicationRecord
   validates :sale_end_at, presence: true
   validates :minimum_age, numericality: { only_integer: true, greater_than_or_equal_to: 0, less_than_or_equal_to: 120 }, allow_nil: true
   validates :event_id, presence: true
-  validates :requires_id, inclusion: { in: [true, false] }
+  validates :requires_id, inclusion: { in: [ true, false ] }
 
   # Custom validations
   validate :sale_end_after_start
@@ -22,7 +22,7 @@ class TicketType < ApplicationRecord
   scope :available_now, -> { where("sale_start_at <= ? AND sale_end_at >= ?", Time.current, Time.current) }
   scope :upcoming, -> { where("sale_start_at > ?", Time.current) }
   scope :expired, -> { where("sale_end_at < ?", Time.current) }
-  
+
   # Helper methods
   def price_euros
     return 0.0 if price_cents.nil?
@@ -45,7 +45,7 @@ class TicketType < ApplicationRecord
 
   def available_quantity
     return 0 if quantity.nil?
-    [quantity - tickets.count, 0].max
+    [ quantity - tickets.count, 0 ].max
   end
 
   def sales_status
@@ -53,7 +53,7 @@ class TicketType < ApplicationRecord
     return :expired if sale_end_at < Time.current
     return :upcoming if sale_start_at > Time.current
     return :sold_out if sold_out?
-    return :available
+    :available
   end
 
   def total_potential_revenue