add base config function

lib/rails_admin/create_xcx_qrcode.rb

@@ -25,7 +25,7 @@ module RailsAdmin
                     require 'rest-client'
                     wx_user = WxUser.where("id = ? ",@object.id).first
                     n = "此会员已生成二维码"
-                    if wx_user.invite_qrcode_url.empty?
+                    if !wx_user.blank?
                         n = "已成功生成二维码"
                         url = "#{CONFIG_FILE["api_host"]}/railsadmin/create_xcx_qrcode/#{@object.id}"
                         begin