Updating the admin account view to show use the new account_invoice model to display data

app/models/billable_period.rb

@@ -25,14 +25,19 @@ class BillablePeriod < ActiveRecord::Base
     end
   end
 
-  def adjustment_label
+  def label
     enterprise_version = enterprise.version_at(begins_at)
     category = enterprise_version.category.to_s.titleize
     category += (trial ? " Trial" : "")
+
+    "#{enterprise_version.name} (#{category})"
+  end
+
+  def adjustment_label
     begins = begins_at.localtime.strftime("%d/%m/%y")
     ends = ends_at.localtime.strftime("%d/%m/%y")
 
-    "#{enterprise_version.name} (#{category}) [#{begins} - #{ends}]"
+    "#{label} [#{begins} - #{ends}]"
   end
 
   def delete

app/models/spree/user_decorator.rb

@@ -7,6 +7,7 @@ Spree.user_class.class_eval do
   has_many :enterprises, through: :enterprise_roles
   has_many :owned_enterprises, class_name: 'Enterprise', foreign_key: :owner_id, inverse_of: :owner
   has_many :owned_groups, class_name: 'EnterpriseGroup', foreign_key: :owner_id, inverse_of: :owner
+  has_many :account_invoices
   has_many :billable_periods, foreign_key: :owner_id, inverse_of: :owner
   has_one :cart
   has_many :customers