ruby-on-rails - Active Record 验证：长度错误消息以显示实际长度？

Question

我有一个类，我正在使用 validates 方法来检查长度，并且我想将实际长度注入错误消息中。这可能吗？

这是我当前使用验证的课程：

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"
  }

错误信息显示：

2 errors prohibited this job from being saved.

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

但我想展示：

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

Answer 1

对于您的解决方案，您可以通过自定义验证

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.