Rails里有些方法使用一個Hash作為最后一個可選的參數，如果對多個方法有同樣的選項，我們可以使用with_options來減少冗余:
ruby代碼

#?models/user.rb??

with_options?:if?=>?:should_validate_password??do?|user|??

??user.validates_presence_of?:password??

??user.validates_confirmation_for?: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??

# models/user.rb with_options :if => :should_validate_password? do |user| user.validates_presence_of :password user.validates_confirmation_for :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

轉載于:https://www.cnblogs.com/orez88/articles/1519624.html

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