(Ž鐃緒申痢鐃緒申Ž鐃緒申鐃�)o鐃淳�緒申 sasata299's blog

2011鐃緒申鐃緒申鐃緒申07·鐃緒申鐃�26鐃緒申鐃緒申鐃緒申13:29

$\«\Æ\´\ê¡¼¤Ç¤¹$ Ruby

Rails\鐃緒申\鐃緒申鐃�\鐃緒申鐃�\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�³鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃殉�緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申��申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�\鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃�

Object#presence 鐃緒申鐃緒申鐃緒申 Object#try 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃獣�緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃�\鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申³鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃述�署´�緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申¹鐃緒申鐃�«鐃緒申�鐃渚™申³鐃緒申鐃緒申鐃渋￥申²鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申\鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�¾鐃緒申鐃�²鐃緒申�鐃緒申·鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃塾�緒申鐃緒申鐃緒申鐃緒申¹鐃緒申臓鐃�

Object#presence \鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃�

鐃緒申鐃�³鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃暑Ǚ申²¼鐃緒申鐃緒申鐃渋�緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�µ鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申¹鐃緒申臓鐃�

def presence
  self if present?
end

present? \鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�¹\鐃緒申鐃� blank? 鐃緒申鐃緒申鐃渋�緒申鐃緒申�鐃緒申Ð鐃緒申鐃緒申鐃緒申\鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃� (!blank?) 鐃緒申鐃緒申鐃緒申鐃緒申鐃�¹鐃緒申臓鐃�

鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申臓鐃�nil, false, [](鐃緒申鐃緒申�鐃緒申鐃緒申��緒申), {}(鐃緒申鐃緒申鐃�\鐃緒申鐃�\鐃緒申鐃�\·\鐃緒申鐃�), ""(鐃緒申鐃緒申�鐃緒申鐃緒申鐃�»鐃緒申��緒申), " "(鐃緒申鐃�¾³鐃緒申鐃�\¹\鐃緒申��申¼\¹鐃緒申鐃緒申鐃緒申鐃緒申鐃殉�緒申鐃緒申�鐃緒申鐃緒申鐃�»鐃緒申��緒申)鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�Ð false鐃緒申臓鐃緒申½鐃緒申鐃緒申鐃緒申鐃暑Ǚ申³鐃暑™申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申Ð true 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�¹鐃緒申�鐃緒申blank? 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�¾³鐃緒申鐃�\¹\鐃緒申��申¼\¹鐃緒申鐃緒申鐃緒申鐃緒申鐃殉�緒申鐃緒申�鐃緒申鐃緒申鐃�»鐃緒申��術�緒申鐃緒申鐃� true 鐃緒申鐃緒申鐃緒申鐃緒申鐃�½鐃緒申鐃緒申鐃緒申鐃緒申鐃�¹鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃渋�緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申·鐃緒申鐃緒申鐃縦�渋�渚¡�緒申鐃緒申臓鐃�

鐃緒申鐃緒申鐃緒申鐃緒申臓鐃緒申³鐃緒申鐃緒申鐃緒申 presence \鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申�鐃緒申鐃緒申鐃� present? \鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申¾²鐃緒申鐃緒申鐃緒申·鐃緒申鐃緒申鐃緒申·鐃緒申鐃�²鐃緒申鐃緒申鐃緒申鐃� true 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�Ð self 鐃緒申鐃緒申鐃述�渋￥申鐃�µ鐃緒申鐃殉�緒申鐃緒申鐃緒申鐃緒申Ð nil 鐃緒申鐃緒申鐃述�緒申鐃緒申�鐃緒申·鐃緒申鐃緒申鐃緒申鐃緒申鐃�¹鐃緒申臓鐃緒申³鐃緒申鐃緒申鐃術�緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃渋￥申

"foo".presence #=> "foo"
[].presence    #=> nil
" ".presence   #=> nil

鐃緒申鐃�³鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申²鐃緒申�鐃緒申漫鐃緒申鐃述�緒申·鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃渋�緒申«鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃獣�緒申鐃緒申鐃緒申鐃渋￥申鐃�³鐃緒申鐃緒申鐃獣�緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申�鐃緒申鐃緒申�鐃緒申¹鐃緒申鐃緒申鐃緒申鐃緒申鐃�鐃緒申鐃緒申鐃緒申½鐃緒申�鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申¹鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申臓鐃�

# 鐃緒申鐃�³鐃緒申鐃緒申鐃獣�緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申�鐃緒申�鐃渋�緒申
name = params[:name].present? ? params[:name] : '鐃緒申鐃�¾鐃緒申鐃�µ鐃緒申鐃�·'

# presence鐃緒申鐃緒申鐃緒申»鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申³鐃緒申鐃緒申鐃獣�緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�!!
name = params[:name].presence || '鐃緒申鐃�¾鐃緒申鐃�µ鐃緒申鐃�·'

Object#try \鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃�

鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃獣°ǚ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申 Object#try \鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申¹鐃緒申臓鐃緒申³鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申 ActiveSupport 2.3 鐃緒申鐃�«鐃緒申鐃緒申鐃緒申鐃緒申鐃�³鐃緒申鐃緒申鐃出�緒申µ鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�·鐃緒申鐃緒申鐃縦�渋￥申
»²¹鐃緒申鐃緒申鐃渋￥申http://guides.rubyonrails.org/2_3_release_notes.html

鐃緒申鐃�³鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申臓鐃�user.name 鐃緒申鐃緒申鐃緒申鐃緒申鐃�·鐃緒申鐃緒申鐃縦�緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申 user.try(:name) 鐃緒申鐃緒申鐃塾�緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申·鐃緒申鐃緒申鐃緒申»鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申¹鐃緒申臓鐃�

鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃獣�緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃渋￥申¼鐃緒申鐃緒申鐃緒申鐃緒申鐃� user.name 鐃緒申鐃緒申鐃緒申鐃緒申鐃�·鐃緒申鐃緒申鐃縦�緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申 user 鐃緒申鐃緒申 nil 鐃緒申鐃緒申鐃緒申¾鐃緒申鐃�¹鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申¹鐃緒申鐃�«鐃緒申臓鐃緒申½鐃緒申鐃緒申鐃獣�緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申 nil.name 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申 NoMethodError 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�·鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃獣�緒申鐃緒申�鐃緒申鐃緒申鐃�\鐃緒申鐃�\鐃緒申\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申�鐃緒申鐃縮�緒申鐃淳�緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申¹鐃緒申鐃縮�渋￥申Object#try \鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申鐃緒申鐃�»鐃緒申鐃緒申鐃署¨�緒申Ð鐃緒申鐃�¹鐃緒申鐃緒申鐃緒申鐃緒申鐃�鐃緒申鐃緒申鐃緒申½鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申³鐃緒申鐃緒申鐃緒申鐃緒申鐃縮�緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�¹鐃緒申臓鐃�

# 鐃緒申鐃�³鐃緒申鐃緒申鐃獣�緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申�鐃緒申�鐃渋�緒申
user ? user.name : '鐃緒申鐃�¾鐃緒申鐃�µ鐃緒申鐃�·'

# try\鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申鐃緒申鐃�»鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申³鐃緒申鐃緒申鐃獣�緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�!!
user.try(:name) || '鐃緒申鐃�¾鐃緒申鐃�µ鐃緒申鐃�·'

鐃緒申鐃�³鐃緒申鐃緒申鐃緒申鐃緒申臓鐃�¼鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃殉�緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃� Object#send \鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申鐃緒申鐃� alias 鐃緒申鐃緒申鐃緒申鐃緒申臓鐃�²鐃緒申鐃緒申鐃署¨�緒申鐃緒申鐃� NilClass#try \鐃緒申鐃�\½\鐃緒申鐃�\鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃�µ鐃緒申鐃緒申鐃緒申µ鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�¹鐃緒申臓鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申³鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃殉�緒申鐃緒申鐃緒申鐃緒申¹鐃緒申鐃縮°Ǚ申³鐃暑™申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申�鐃緒申鐃緒申鐃緒申鐃緒申¹鐃緒申鐃緒申鐃緒申鐃緒申臓鐃�

class NilClass
  def try(*args)
    nil
  end
end

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