增加订单导入功能

app/models/order.rb

@@ -4,7 +4,9 @@ require 'rest-client'
 class Order < ActiveRecord::Base
     has_paper_trail
     self.table_name = 'orders'
-    validates_presence_of :wx_user_id,:total_price,:order_id
+    validates_presence_of :wx_user_id,:total_price
+    validates :order_id, presence: true, uniqueness: true
+
     #belongs_to :user, :foreign_key => :user_id
     #belongs_to :wx_user
     belongs_to :depart_record, :foreign_key => :depart