validates_uniqueness_of, scope

validates_uniqueness_of api


<br /> #同樣的accout_id 不能有相同的 user_name<br /> class Person < ActiveRecord::Base<br /> validates_uniqueness_of :user_name, :scope => :account_id<br /> #不是new record 才會檢查<br /> validates_length_of :change_summary, :min => 10, :unless => :new_record?<br /> end<br />