Active Record验证：显示实际长度的长度错误消息？

Question

我有一个类，我使用validates方法检查长度，我想将实际长度注入错误消息。这可能吗？

这是我目前正在使用验证的课程：

class Something
  validates :summary, :detail, :length => { 
    :in => 300..500,
    :too_short => "must have at least %{count} letters",
    :too_long => "must have at most %{count} letters"
  }

错误消息显示：

2 errors prohibited this job from being saved.

Summary must have at least 300 letters
Detail must have at least 300 letters

但我想表明：

...
Summary is only 250 letters and must have at least 300 letters
...

Answer 1

对于您的解决方案，您可以传递自定义验证

validate:summary_length

def summary_length 
  if self.summary.length < 10 && !self.summary.blank?
    errors[:base] << "is only #{self.summary.size} letters and must have at least 10 letters"
  end
end

Answer 2

试试这个，似乎对我有用：

class Something
    validates :summary,    
        :in => 300..500,
        :too_short => "summary is only #{summary.length} and must have at least %{count} letters"
        # etc.
    validates :detail,
        :in => 300..500,
        :too_short => "detail is only #{detail.length} and must have at least %{count} letters
       # etc.