验证与模型的错误消息相关的信息

I have two model as follows

我有两个模型如下所示

class User < ActiveRecord::Base
 validates_associated :account
end

class Account < ActiveRecord::Base

  belongs_to :user

  #----------------------------------Validations--Start-------------------------
  validates_length_of :unique_url, :within => 2..30 ,:message => "Should be atleast 3 characters long!"
  validates_uniqueness_of :unique_url ,:message => "Already Taken"
  validates_format_of :unique_url,:with => /^([a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9])$/ , :message => " Cannot contain special charaters"
  #----------------------------------Validations--End---------------------------
end
clas