How can I make Rails ActiveRecord automatically truncate values set to attributes with maximum length? -

assuming have class such following:

class book < activerecord::base    validates :title, :length => {:maximum => 10}  end 

is there way (gem install?) can have activerecord automatically truncate values according maximum length?

for instance, when write:

b = book.new b.title = "123456789012345" # longer maximum length of title 10 b.save 

should save , return true?

if there not such way, how suggest proceed facing such problem more generally?

well, if want value truncated if long, don't need validation, because pass. i'd handle this:

class book < activerecord::base   before_save :truncate_values   def truncate_values     self.title = self.title[0..9] if self.title.length > 10   end end