ruby-on-rails - validates_length_of :maximum and :minimum on ruby on rails 的自定义错误消息

Question

我想为 :minimum 和其他为 :maximum 编写自定义错误消息

我有以下代码行

validates_length_of :user_name, :minimum=>5,:maximum=>30

  ej if the length of :user_name is < 5 "The user_name must to have 5 characters as minimum"
  ej if the length of :user_name is > 30 "The user_name must to have 30 characters as maximum" 

Answer 1

较新的表示法是:

validates :user_name,
  length: { 
    minimum: 5,
    maximum: 30,
    too_short: "The user name must have at least %{count} characters.",
    too_long: "The user name must have no more than %{count} characters."
  }

the documentation 中列出了更多示例.

旧的 validates_length_of 类型方法保留在那里用于遗留支持，但可能应该在新代码中避免使用。