rails模型验证

class User < ActiveRecord::Base
02    #Max & min lengths for all fileds
03    SCREEN_NAME_MIN_LENGTH=4
04    SCREEN_NAME_MAX_LENGTH=20
05    PASSWORD_MIN_LENGTH=4
06    PASSWORD_MAX_LENGTH=40
07    EMAIL_MAX_LENGTH=50
08    SCREEN_NAME_RANGE=SCREEN_NAME_MIN_LENGTH..SCREEN_NAME_MAX_LENGTH
09    PASSWORD_RANGE=PASSWORD_MIN_LENGTH..PASSWORD_MAX_LENGTH
10      validates_uniqueness_of :screen_name,   :email
11      validates_length_of :screen_name,   :within=>SCREEN_NAME_RANGE
12      validates_length_of :password,  :within=>PASSWORD_RANGE
13      validates_length_of :email, :maximum=>EMAIL_MAX_LENGTH
14  #  calidates_presence_of :mail
15    validates_format_of :screen_name, :with=>/^[A-Z0-9_]*$/i, :message=>"must contain only letters,"+"number,and underscores"
16    validates_format_of :email,  :with=>/^[A-Z0-9._%-]+@([A-Z0-9-]+\.)[A-Z]{2,4}$/i,  :message=>"must be a vaild email address"
17  #  def validate
18  #    error.add(:email,"must be valid.")unless emils.include?("@")
19  #    if screen_name.include?(" ")
20  #      error.add(:screen_name,"cannot include spaces.")
21  #    end
22  #  end
23  "font-size: 12pt;">end
24