ruby-on-rails - 数值验证，在比较中捕获零值

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 < max_val。但是，如果其中之一为空，我会收到零比较错误，相反，我想告诉用户需要一个数字。

另外，如何更改数值错误消息？

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? }