活動記錄驗證：長度錯誤信息顯示實際長度？

Question

我有一個類，我正在使用驗證方法來檢查長度，我想注入實際長度到錯誤消息。這可能嗎？

這裏是我當前的類，我現在用的驗證：

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" 
    } 

和錯誤消息顯示：

2 errors prohibited this job from being saved. 

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

但是我想表明：

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

Answer 1

您的解決方案，你可以通過自定義驗證

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

試試這個，似乎對我很有用：

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.