新增: 邮箱验证码重新发送后之前的验证码需设置为无效

app/controllers/api/v1/users_controller.rb

@@ -29,6 +29,8 @@ class Api::V1::UsersController < Api::V1::BaseController
       tip_exception(-2,"邮件发送失败，请稍后重试")
     end
     ver_params = {code_type: code_type, code: verification_code, email: mail} 
+    last_code = VerificationCode.where(code_type: code_type, email: mail).last
+    last_code.update_attributes!({created_at: Time.current - 10.minute}) if last_code.present?
 		data = VerificationCode.new(ver_params)
     if data.save!
       render_ok