Ruby中delegate的一些用法

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classs Admin < activeRecord::Base      delegate :firstname, :to => :user   # 等价于   # firstname => user.firstname     # delegate :firstname, :to => :user, :prefix => true   # 等价于   # user_firstname => user.firstname     # delegate :firstname, :to => :user, :allow_nil => true, :prefix => true   # 等价于   #  user_firstname => user.try(:firstname)       # delegate :name, :to => "user.try(:editor)", :prefix => :editor   # 等价于   # editor_name => user.try(:editor).name  #注意空异常     # delegate :name, :to => "user.try(:editor)", :prefix => :editor, :allow_nil => true   # 等价于   # editor_name => user.try(:editor).try(:name)   end