σίϨʔλͷ ͸ͳ͠ ौ୩SC<> 5BLFTIJ:BCF!UZBCF

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app/views/posts/show.slim - if @post.image.present? = image_tag @post.image.url - else = image_tag ‘default.png’ ͜Μͳͷ͕ͲΜͲΜͲΜͲΜ૿͑ͯ͘Δ WJFX

models/post.rb class Post < ActiveRecord::Base def image_url if self.image.present? self.image.url else ‘default.png’ end end end app/views/posts/show.slim = image_tag @post.image_url NPEFM

models/post.rb class Post < ActiveRecord::Base def image_url if self.image.present? self.image.url else ‘default.png’ end end end app/views/posts/show.slim = image_tag @post.image_url 7JFX༻ͷϝιου͕ .PEFMʹೖ͍ͬͯΔ ΩϞ͍ NPEFM

)FMQFS app/helpers/posts_helper.rb StitchStitch::App.helpers do # ... end ɾϝιου໊ͷিಥΛؾʹ͢Δඞཁ͕͋Δ ɾ001ͬΆ͘ͳ͍

models/post.rb class Post < ActiveRecord::Base end app/controllers/posts_controller.rb SampleProject::App.controllers :posts do get :show, with: :id do post = Post.find(params[:id]) @post_decorator = PostDecorator.new(post) render ‘posts/show’ end end app/views/posts/show.slim - if @post_decorator.is_new_page? = image_tag @post_decorator.image app/decorators/posts_decorator.rb class PostDecorator attr_reader :post def initialize(post) @post = post end def image_url if self.image.present? self.image.url else ‘default.png’ end end end දࣔ༻ͷϩδοΫΛ%FDPSBUPSʹҠ͢

spec/app/decorators/post_decorator_spec.rb require 'spec_helper' describe "PostDecorator" do it 'can construct a new instance' do post = create(:post) @post_decorator = PostDecorator.new(post, self) expect(@post_decorator.image_url).to eq ‘default.png’ end end ςετ΋ॻ͖΍͘͢ͳΔ

ؾܰʹ࢖͍͍ͨͷͰ (FOFSBUPSΛ࡞ͬͨ

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$ padrino g decorator Usage: padrino-gen decorator [name] Options: -r, [--root=ROOT] # The root destination # Default: . -a, [--app=APP] # The application destination path # Default: /app -d, [--destroy] -n, [--namespace=NAMESPACE] # The name space of your padrino project Description: padrino-gen decorator generates a new Padrino decorator ͔͍͔ͭͨ

$ tree . ᵓᴷᴷ app ᴹ ᵓᴷᴷ app.rb ᴹ ᵓᴷᴷ controllers ᴹ ᵓᴷᴷ decorators ᴹ ᴹ ᵋᴷᴷ post_decorator.rb ᴹ ᵓᴷᴷ helpers ᴹ ᵋᴷᴷ views ᵋᴷᴷ spec ᵋᴷᴷ app ᵋᴷᴷ decorators ᵋᴷᴷ post_decorator_spec.rb %FDPSBUPS༻ͷϑΝΠϧΛͭ͘Γ·͢

Rails

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%SBQFS΋࣮ݱ͢Δ͜ͱ͸جຊతʹ͸ಉ͡Ͱ͢ ͕ɺํࣜʹҧ͍͕͋Γ·͢ɻ"DUJWF%FDPSBUPS͸ ϞσϧΦϒδΣΫτʹϞδϡʔϧΛFYUFOE͢Δ ͷʹର͠ɺ%SBQFS͸ϞσϧΦϒδΣΫτΛϥοϓ ͢ΔΦϒδΣΫτΛ࡞ͬͯϝιουΛҠৡ͠· ͢ɻ %SBQFSͷํࣜͰ͸ϝιουΛ௥Ճ͢Δલͱͨ͠ ޙͰΦϒδΣΫτͷJEFOUJUZ͕มԽͯ͠͠·͏ͨ ΊɺΑ͘Α͘஫ҙ͠ͳ͍ͱϋϚΓ·͢ɻ Ҿ༻ɿ3VCZJTU.BHB[JOF3VCZPO3BJMT5IF#BE1BSUT IUUQNBHB[JOFSVCZJTUOFU 3BJMT5IF#BE1BSUT

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