Question

我有一个包含数字范围和描述[min_val，max_val，name]的对象。我需要验证min_val＆lt; MAX_VAL。但是，如果其中一个是空白的，我会得到一个零比较错误，相反，我想告诉用户需要一个数字。

另外，如何更改数字的错误消息？

validates :min_val, :presence => true, :numericality => {:greater_than => 0, :less_than => :max_val}

validates :max_val, :presence => true, :numericality => {:greater_than => 0, :greater_than => :min_val}

validates :name, :presence => true, :if => Proc.new { |r| !r.min_val.nil? || !r.max_val.nil? }

Answer 1

您可以使用:message指定自定义错误消息。

validates :max_val, :presence => true, :numericality => {:greater_than => 0, :message => " is an invalid number."}
validates :min_val, :presence => true, :numericality => {:greater_than => 0, :message => " is an invalid number."}
validate do |record|
  record.errors.add_to_base("The min_val should be less than max_val") if min_val.to_i >= max_val.to_i
end
validates :name, :presence => true, :if => Proc.new { |r| !r.min_val.nil? || !r.max_val.nil? }

数值验证，在比较中捕获零值

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