add auto take cash function

app/models/order.rb

@@ -6,7 +6,7 @@ class Order < ActiveRecord::Base
     self.table_name = 'orders'
     validates_presence_of :user_id,:wx_user_id,:total_price,:order_id
     #belongs_to :user, :foreign_key => :user_id
-    belongs_to :wx_user, :foreign_key => :wx_user_id
+    belongs_to :wx_user
     belongs_to :depart_record, :foreign_key => :depart
 
     has_many :order_details