验证机制

ruby 代码

#有效性的验证,通过调用activerecord中的validate method实现

#非空字段
validates_presence_of :fieldname,:others

#字段长度
validates_length_of :fieldname,:within=>1..10

#类型
validates_numericality_of :fieldname

#唯一性
validates_uniqueness_of :fieldname

#自定义校验
#重写protected validate方法，该方法会在save之前被rails自动调用。eg.
protected def valiedate
     errors.add(:fieldname,"notice infomation") if condition
    end

#自定义message
validates_xxxx_of :name, :message=>'请输入用户名'

#复杂格式校验，通过正则表达式匹配
validates_format_of :fieldname,:with => pattern,:message => "notice infomation"

#跨model验证
#Model
class User <ActiveRecord::Base
    has_one :user_data
    validates_presence_of :name , :email
    validates_associated :user_data
end
class UserData < ActiveRecord::Base
    belongs_to :user
    validates_presence_of :sex
end
#View
<p>
<label for="user_email">Email<label><br/>
<%= text_field 'user', 'email'  %>
<%= @user.user_data.errors['sex'] if @user.user_data %>
<p>