add balance promotion shop promotion

app/models/present.rb

@@ -2,7 +2,7 @@
 class Present < ActiveRecord::Base
   has_paper_trail
   self.table_name = "presents"
-  validates :code,:name,:remark,presence: true
+  validates :wx_user_id,:send_prod1,:remark,presence: true
   belongs_to :wx_user
   SOURCE_ENUM = [["店长促销发放", "shop"],
                  ["充值促销发放", "balance"],