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エラーと仲良くなる方法
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にゅ〜ぶる
November 10, 2019
Programming
1
53
エラーと仲良くなる方法
にゅ〜ぶる会のもくもく会(2019.11.10)で実施したLT資料
にゅ〜ぶる
November 10, 2019
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Transcript
Τϥʔͱྑ͘ͳΔํ๏ʁ ʹΎʙͿΔ
ΞδΣϯμ ͡Ίʹ Τϥʔͱྑ͘ͳΔํ๏ ͓ΘΓʹ
ΞδΣϯμ ͡Ίʹ Τϥʔͱྑ͘ͳΔํ๏ ͓ΘΓʹ
͡Ίʹ ͱΓ͋͑ͣࣗݾհʁ ʙ4&4ʹۈΊͯɺʁ ۀܥ8FCγεςϜΛ։ൃ ܦݧͨ͠ݴޠ $0#0- +BWB 1)1 3VCZ झຯͰ
ݸਓ։ൃͰ8FCαʔϏεΛ։ൃ ۦ͚ग़͠ΤϯδχΞ͚ίϛϡχςΟΛӡ༻
͡Ίʹ 5XJUUFS
ΞδΣϯμ ͡Ίʹ Τϥʔͱྑ͘ͳΔํ๏ ͓ΘΓʹ
Τϥʔͱྑ͘ͳΔํ๏ ఢͷ༰࢟Λ๙ΊΖ ఢͷྑ͞Λݟ͚ͭΖ ఢͷʹ߹ΘͤΑ͏ ଞͷఢͱͷͨΊʹɺύλʔϯΛݟ͚ͭΖ
Τϥʔͱྑ͘ͳΔํ๏ ఢͷ༰࢟Λ๙ΊΖ ఢͷྑ͞Λݟ͚ͭΖ ఢͷʹ߹ΘͤΑ͏ ଞͷఢͱͷͨΊʹɺύλʔϯΛݟ͚ͭΖ
༰࢟Λ๙ΊΖ ɺɺ߳ਫɺͲ͏ߏ͞Ε͍ͯΔͷ͔ʁ ͱ͍ Τϥʔը໘͕Ͳ͏ߏ͞Ε͍ͯΔͷ͔ʁ Ͳ͜ʹԿ͕͋Δͷ͔ʁ
දࣔ͞Ε͍ͯΔ༰ͳΜͳͷ͔ʁ
lCFUUFS@FSSPSTΛαϯϓϧʹͯ͠ΈΔz
Τϥʔϝοηʔδ ΤϥʔτϨʔε ΤϥʔՕॴ irb(rails c) ϦΫΤετใ มใ
Τϥʔͱྑ͘ͳΔํ๏ ఢͷ༰࢟Λ๙ΊΖ ఢͷྑ͞Λݟ͚ͭΖ ఢͷʹ߹ΘͤΑ͏ ଞͷఢͱͷͨΊʹɺύλʔϯΛݟ͚ͭΖ
ྑ͞Λݟ͚ͭΖ إʁελΠϧʁਓ֨ʁ ͱ͍ Τϥʔը໘ͷͲ͕͜Ұ൪ॏཁͳͷ͔ʁ ͦΕ͕ԿΛҙຯ͍ͯ͠Δͷ͔ʁ
άάΔΩʔϫʔυ͕ͲΕͳͷ͔ʁ
Τϥʔϝοηʔδ ΤϥʔൃੜՕॴ
Τϥʔͱྑ͘ͳΔํ๏ ఢͷ༰࢟Λ๙ΊΖ ఢͷྑ͞Λݟ͚ͭΖ ఢͷʹ߹ΘͤΑ͏ ଞͷఢͱͷͨΊʹɺύλʔϯΛݟ͚ͭΖ
ʹ߹ΘͤΑ͏ ΤϥʔϝοηʔδͷҙຯΛཧղ͠Α͏ ʢຊޠɾࣗͷཧղͰ͖Δݴ༿ʢ͠ݴ༿Ͱྑ͍ʣ ʹͳ͓ͦ͏ʣ ͨͩ͠ɺάάΔͳΒӳޠͷ··Ͱɻ ӳޠͰ؆୯ͳ୯ޠ͙Β͍ɺΘ͔ΔͰ͠ΐ͏ʁ ͦͯ͠ɺͻͱͭͣͭɻॱ൪ʹɻ ͏Μɺωλ͍͔ͬʜ
ΤϥʔϝοηʔδΛมͯ͠ΈΑ͏ ʮVOEFpOFENFUIPEAOBNFGPSOJM/JM$MBTTʯ VOEFpOFENFUIPEAOBNF` OBNFͬͯϝιουΒͶ͑ͧɺ͜Μͪ͘͠ΐ͏ʂ OJM/JM$MBTT OJMͩʂOVMMͩΑʂΜͷ͔͜Β͊ʂʂ ͭ·Γɺ OJMʹɺOBNFͬͯϝιουͳΜͯΒͶ͑ͧɺΜ ͷ͔͜Β͊ʂʂͳΊͯͨΒ͍ͯ·͏ͧɺ͝Β͊͊ ͋ʂʂ
भหා͍Ͷʜ
ͻͱͭͣͭ ΤϥʔʹͳͬͨՕॴ͔Βɺམͪண͍ͯॱʹݟ͍ͯ͜͏ ɹʮVOEFpOFENFUIPEAOBNFGPSOJM/JM$MBTTʯ !FWFOUOJM !FWFOUOBNFɹˡΤϥʔ͜͜ @event͕nil͔ͩΒ͔ʂ @eventͷϝιου(name)͕ଘࡏ͠ͳ͍ʁ ͳΜͰʁ
Τϥʔͱྑ͘ͳΔํ๏ ఢͷ༰࢟Λ๙ΊΖ ఢͷྑ͞Λݟ͚ͭΖ ఢͷʹ߹ΘͤΑ͏ ଞͷఢͱͷͨΊʹɺύλʔϯΛݟ͚ͭΖ
Α͘ग़ͯ͘ΔͷΛ֮͑Α͏ Α͘ग़ͯ͘Δӳ୯ޠΛ֮͑Α͏ ɹͲΜͳݴޠͰɺ͍͍ͩͨಉ͡ӳ୯ޠ͕ग़ͯ͘Δ ݟ׳Εͨ୯ޠͳΒɺݪҼ͙͢ʹΘ͔ͬͯ͘Δʢͣ 4ZOUBY ɹ˞͓ͦΒ͘ɺ͍͕ͭ͜Ұ൪ΊΜͲ͍ͭ͘͞ʜ 6OEFpOFE "MSFBEZ "VUI 5JNFPVU
6OJRVF
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lͭ·Γz
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lͦͯ͠z
lఘΊͳ͍z
͍ɺಛʹఘΊඞཁ ࣌ؒΛܾΊͯௐࠪ͠Α͏ ɹແཧͳΒࣗͰఘΊͯɺ୭͔ʹ࣭͠Α͏ ৸Α͏ɾ͓෩࿊ͳͲͰϦϑϨογϡ ɹϦϑϨογϡ͢Δͱؾ͘͜ͱ͋Δ
lͦΕͰz
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l͏ΜɺఘΊΑ͏z
ఘΊΔ ࠓஔ͍͓͍ͯͯɺผͷ͜ͱΛ͢Δ (JUͷελογϡͰୀආ HJUTUBTI99999 HJUqPXͰϒϥϯν։ൃ HJUqPXGFBUVSFTUBSU99999
l͏Μɺ͓ΘΓz
l͍ͪΜݴ͍͍ͨͷ ɺΤϥʔා͘ͳ͍Αz
ΞδΣϯμ ͡Ίʹ Τϥʔͱྑ͘ͳΔํ๏ ͓ΘΓʹ
͓ΘΓʹ ʮʹΎʙͿΔձʯͬͯʁʁʁ ͜Μͳࣄ͋Γ·ͤΜ͔ʁ ࣭πΠʔτʹϦϓ͕དྷͳ͍ʜ ͜Μͳ࣭ͯ͠ྑ͍ͷͩΖ͏͔ʜ ͜ΜͳํΉ͚ ࢠҭͯʹ͍͠ओ්͞Μ தࣄͰɺʹษڧ͍ͯ͠Δํ ۦ͚ग़͠ΤϯδχΞ͚ɺແྉͷ࣭ίϛϡχςΟ ৄ͘͠ɺͪ͜ΒɹˠIUUQTOFXCVSVHJUIVCJP