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Block is everywhere Event: LegalForce Ruby Meet Up #1 Date: 2019-12-11 Speaker: େ૔խ࢙

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pp self • ໊લɿେ૔խ࢙ • ॴଐɿϑϦʔϥϯε • ΤσΟλɿVim • Α͍͘ΔίϛϡχςΟɿGrow.rbʢओ࠵ʣɺTama.rbͳͲ

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RubyͷϒϩοΫ͸ૉ੖Β͍͠

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RubyͷϒϩοΫͷ࢖ΘΕํ

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RubyͷϒϩοΫ͕࢖ΘΕ͍ͯΔՕॴ • RailsͷϨΠΞ΢τͷϨϯμϦϯάʢyieldʣ • ֤छgemͷઃఆʢconfigure doʣ • Rake΍FactoryBotʹ୅ද͞ΕΔDSL • Ϧιʔεͷ؅ཧ • ϑοΫͷఆٛ • etc…

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RailsͷϨΠΞ΢τͷϨϯμϦϯά • ϨΠΞ΢τϑΝΠϧͷதʹ͋Δ”yield”͸࣮͸ϒϩοΫΛධՁ͠ ͍ͯΔ • RailsͷϏϡʔʢςϯϓϨʔτʣ͸࠷ऴతʹ͸Rubyͱ࣮ͯ͠ߦ͞ ΕΔͷͰೖΕࢠΛ࣮ݱ͢ΔͷʹϒϩοΫΛωετ͍ͤͯ͞Δͱ ࢥΘΕΔ • Ұ൪ແҙࣝʹϒϩοΫΛ࢖͍ͬͯΔՕॴͰ͸ʁ

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֤छgemͷઃఆ • “configure do |config|”ͱ͔ͷΞϨ͸౰વϒϩοΫΛ࢖͍ͬͯΔ • ίϯϑΟάΦϒδΣΫτʹΞΫηε͢Δͷ͕௚ײతʹͰ͖Δ • ઃఆ͞ΕΔଆ͸”config = Config.new; yield(config)”Έ͍ͨʹ ॻ͚Δ • ࣮͸ϒϩοΫΛ࢖͏ඞཁ͸ͳ͍…ʁ

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DSL • DSLΛ࣮૷͢ΔͷʹϒϩοΫʢͱ͍͏ΑΓProcΦϒδΣΫτ ͱ”instance_eval”ϝιουʣ͸ඞਢ • RSpecͩͱϒϩοΫΛ࣮ߦ͢Δͨͼʹಗ໊ΫϥεΛ࡞੒͍ͯͨ͠ Γ΋͢Δ • ʮϝλϓϩάϥϛϯάRubyʯͱ͍͏໊ஶΛಡΉͱ࢓૊Έ͕Θ͔Δ

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Ϧιʔεͷ؅ཧ • “File.open do |f|”͕୅දత • “Net::HTTP.start do |http|”ͳΜ͔΋ͦ͏ • ϝιου͕ϦιʔεΛ࡞੒͠ɺϒϩοΫ͕ด͡ΔͱϦιʔε΋ ด͡ΒΕΔ

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ϑοΫͷఆٛ • RSpecͷ”before(:each)”΍Railsͷ”before_action”ͳͲ͕୅දత • ϒϩοΫͷத਎ΛProcΦϒδΣΫτͱͯ࣋ͪ͠ճ͢ • aroundܥͷϑοΫ͸಺෦ͰyieldΛݺͿͱຊॲཧ͕૸ΔͷͰೋ ॏʹϒϩοΫΛ࢖͍ͬͯΔ

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ଞʹ΋৭ʑͳϝιου͕ϒϩοΫΛड͚Δ • Enumerable#countʢϒϩοΫ͕trueͷཁૉΛ਺͑Δʣ • ActiveRecord::Relation#buildʢϒϩοΫ಺ͰΠϯελϯεઃఆʣ • Hash.newʢॳظԽͷํ๏Λنఆʣ • String#gsubʢஔ׵ͷํ๏Λنఆʣ

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͓·͚

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RubyͷϒϩοΫ͸Ϋϩʔδϟ

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पғͷ؀ڥʹΞΫηεͰ͖ΔͷͰɺ ৭ʑͱϋοΫ͢Δ͜ͱ͕Ͱ͖Δ

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ྫɿΧ΢ϯλΦϒδΣΫτ