Update qbo_purchase.rb

app/models/qbo_purchase.rb

@@ -15,11 +15,11 @@ class QboPurchase < ActiveRecord::Base
   attr_accessible :description
   validates_presence_of :id, :line_id, :description, :qbo_customer_id
   
-  def get_base
+  def self.get_base
     Qbo.get_base(:purchase)
   end
 
-  def get_purchase(id)
+  def self.get_purchase(id)
     get_base.service.find_by_id(id)
   end