#42 with_options

最新推荐文章于 2024-10-08 17:25:45 发布

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本篇介绍Rails中如何使用with_options方法减少重复代码，通过示例展示了如何在models和routes中应用该方法来统一设置。

Several methods in rails take a hash of options as the last argument. If you are passing the same options to several methods, you can remove this duplication by using with_options. Learn all about it in this episode.

# models/user.rb
with_options :if => :should_validate_password? do |user|
  user.validates_presence_of :password
  user.validates_confirmation_of :password
  user.validates_format_of :password, :with => /^[^\s]+$/
end

attr_accessor :updating_password

def should_validate_password?
  updating_password || new_record?
end

# routes.rb
map.with_options :controller => 'sessions' do |sessions|
  sessions.login 'login', :action => 'new'
  sessions.logout 'logout', :action => 'destroy'
end