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Become a gorm feeling and use gorm
linyows
April 15, 2018
Programming
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14k
Become a gorm feeling and use gorm
Gormの気持ちになってGormを使う
Aprio 15, 2018 @Go Conference 2018 Spring でお話しした資料です
linyows
April 15, 2018
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Transcript
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5PNPIJTB0EB(.01FQBCP *OD "QSJM (PSNͷؾ࣋ͪʹͳͬͯ(PSNΛ͏ (P$POGFSFODF4QSJOH
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(P$POGFSFODF4QSJOH ʘԬ͔Βདྷ·ͨ͠ʗ !NPOPDISPNFHBOF͞Μͨͪͱ 'VLVPLBHPΛӡӦ͍ͯ͠·͢ ࣸਅɿԬࢢ
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(P$POGFSFODF4QSJOH (.0ϖύϘϓϦϯγύϧΤϯδχΞ খాԝ!MJOZPXT ٕज़෦ٕज़ج൫νʔϜ IUUQUPNPIJTBPEBDPN
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(P$POGFSFODF4QSJOH ϩϦοϓʂ ϚωʔδυΫϥυ ·ͳ͘ ਖ਼ࣜ൛ϦϦʔε
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(P$POGFSFODF4QSJOH ݄ʹൃചͷ 8&# %#13&44WPM )BTIJ$PSQ7BVMUͷ هࣄΛدߘ͠·ͨ͠ ͜Ε
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(P$POGFSFODF4QSJOH MJOVYϢʔβͷ໊લղܾΛ HJUIVCνʔϜίϥϘϨʔλͰ ߦ͏ιϑτΣΞΛ࡞͍ͬͯ·͢ IUUQTHJUIVCDPNMJOZPXTPDUPQBTT
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(P$POGFSFODF4QSJOH (PSNͬͨ͜ͱ͋Γ·͔͢ʁ ▸ 03.0CKFDU3FMBUJPOBM.BQQFS ▸ ଟɺ(PͰҰ൪ϝδϟʔͳ03. ▸ (PSNͷଞʹHPSQ YPSN TRMY
▸ ΄͔ͷݴޠͩͱɺ"DUJWF3FDPSE 3VCZ &MPRVFOU 1)1 4FRVFMJ[F /PEFKT "DUJWF3FDPSEͷѹతʜʜʜʜ
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(P$POGFSFODF4QSJOH type Product struct { gorm.Model Code string Price uint
} func main() { db, _ := gorm.Open("sqlite3", "test.db") defer db.Close() db.Create(&Product{Code: "L1212", Price: 1000}) var p Product db.First(&p, 1) db.First(&p, "code = ?", "L1212") db.Model(&p).Update("Price", 2000) db.Delete(&p) } (PSNͷ͍ํ
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গͳ͍ίʔυྔͰςʔϒϧߦΛߏମʹ Ϛοϐϯάͯ͘͠ΕΔ %#ίωΫγϣϯͱߏମʢϞσϧʣΛ ͚ͯ͏ (P$POGFSFODF4QSJOH
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(P$POGFSFODF4QSJOH (PSNͷػೳ ▸ "TTPDJBUJPOTIBTNBOZ CFMPOHTUP QPMZNPSQIJTN ▸ )PPLTCFGPSFBGUFS ▸ 1SFMPBEJOH
▸ 5SBOTBDUJPOT ▸ $PNQPTJUF1SJNBSZ,FZ
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'VMM'FBUVSFE03. BMNPTU (P$POGFSFODF4QSJOH
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(P$POGFSFODF4QSJOH err := db.Debug().Where("role = ?", "admin").Or("role = ?", "super").Find(&users).Error
// SELECT * FROM users WHERE role = 'admin' OR role = 'super'; (PSNͷಛ (PͰ͍͠ϝιουνΣʔϯ ϝιουνΣʔϯͳͷͰಈతͳΫΤϦ࡞͕؆୯Ͱ͖Δ ϝιουνΣʔϯͷͨΊʹΤϥʔΛߏମʹೖΕ͍ͯΔ
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(P$POGFSFODF4QSJOH package gorm type Model struct { ID uint `gorm:"primary_key"`
CreatedAt time.Time UpdatedAt time.Time DeletedAt *time.Time `sql:"index"` } package model type User struct { gorm.Model Name string } (PSNͷϞσϧఆٛ
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(P$POGFSFODF4QSJOH $ find model -type f -not -name '*_test.go' |
wc -l 35 $ find model -type f -not -name '*_test.go' | xargs grep 'func' | grep -v '\sfunc' | wc -l 196 # ???????????????? ଟ͘ͳ͍ʁ $ find api -type f -not -name '*_test.go' | wc -l 22 (PSNΛར༻ͨ͠ɺ͋Δ"1*4FSWFS
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Ϟσϧʹ ؔɺϝιουཚཱ (P$POGFSFODF4QSJOH
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(P$POGFSFODF4QSJOH func FindUserByName(n string) *User, error { u := new(User)
if err := db. First(u, "name = ?", n).Error; err != nil { return nil, err } return u, nil } Ϟσϧͷཚཱؔɺϝιου1BSU ·͋ɺΓ͍ͨ͜ͱΘ͔Δ
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(P$POGFSFODF4QSJOH func FindUserByNameWithProfile(n string) *User, error { u := new(User)
if err := db. Preload("Profile").First(u, "name = ?", n).Error; err != nil { return nil, err } return u, nil } Ϟσϧͷཚཱؔɺϝιου1BSU ଞͷϞσϧґଘΛՃʜ
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(P$POGFSFODF4QSJOH func FindUserByNameWithAll(n string) *User, error { u := new(User)
if err := db. Preload("Profile"). Preload("Projects"). Preload("Projects.Repositories"). Preload("Roles").First(u, "name = ?", n).Error; err != nil { return nil, err } return u, nil } Ϟσϧͷཚཱؔɺϝιου1BSU ͋Ε͜ΕՃ͞Ε·ͯ͠ʜ
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(P$POGFSFODF4QSJOH
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(P$POGFSFODF4QSJOH func FindUserByName(n string, Preload ...string) *User, error { d
:= db for _, v := range preloads { d = d.Preload(v) } u := new(User) if err := d.First(&u, "name = ?", n).Error; err != nil { return nil, err } return u, nil } Ϟσϧͷཚཱؔɺϝιου1BSU ͏·͍ͬͯ͘Δ෩ʜ
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(P$POGFSFODF4QSJOH (u *User) FindByName(n string) error { if err :=
db. First(u, "name = ?", n).Error; err != nil { return err } return nil } Ϟσϧͷཚཱؔɺϝιου1BSU ͪΐͬͱ͓Μͳ͡Μ
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(P$POGFSFODF4QSJOH ͜Ε͍͔Μʜ ▸ ࠣࡉͳҧ͍Ͱؔϝιου͕ྔ࢈͞Ε͍ͯΔ ▸ ςετίʔυͳͲɺཧίετ૿͍͑ͯΔ ▸ ଞͷϞσϧґଘɺόάͷԹচ
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Կ͕ਖ਼͍͠ͷ͔Θ͔ΒΜ͕ Կ͔ؒҧ͍͑ͯΔ͜ͱΘ͔ͬͨ (PSNͷؾ࣋ͪʹͳΖ͏ (P$POGFSFODF4QSJOH
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%#ίωΫγϣϯͱߏମʢϞσϧʣΛ͚ͯ͏͔Β ͍ΘΏΔ.7$Ͱߟ͑ΔͱɺϞσϧʹผϨΠϠʔͰ͋Δ%#ૢ࡞ΛӅ ณ͢Δͷ͕ࣗવʁ ͋ΒͨΊͯ"DUJWF3FDPSEత03.Λߟ͑Δ (P$POGFSFODF4QSJOH Ͳ͏ͯ͜͠͏ͳͬͨʁ ▸ ͞ΕͨͭΛͭʹϥοϓͨ͘͠ͳΔ ▸ ΫΤϦͷ࡞ΓํͰऔಘͰ͖Δߏମ͕มԽ͢Δ
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"DUJWF3FDPSE%FTJHO1BUUFSO "OPCKFDUUIBUXSBQTBSPXJOBEBUBCBTFUBCMFPSWJFX FODBQTVMBUFTUIFEBUBCBTFBDDFTT BOEBEETEPNBJOMPHJDPOUIBU EBUB .BSUJO'PXMFS
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ςʔϒϧͷߦΛΧϓηϧԽͨ͠ΦϒδΣΫτʹ υϝΠϯϩδοΫΛੜ͢ύλʔϯ (P$POGFSFODF4QSJOH ͭ·Γ
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(P$POGFSFODF4QSJOH 3VCZʹ͓͍ͯͷ"3σβΠϯ ▸ 5BCMF$MBTT ▸ 5BCMF3PX*OTUBODF ▸ 5BCMF3PXT"SSBZ ▸ %PNBJO-PHJD*OTUBODF.FUIPE
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(P$POGFSFODF4QSJOH user = new User(name: 'linyows') user.save() 3VCZʹ͓͍ͯͷ"3σβΠϯ Πϯελϯε͔ΒอଘͰ͖Δ ͳͥͳΒΫϥεʹ%#ίωΫγϣϯΛแ͍ͯ͠Δ͔Β
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(P$POGFSFODF4QSJOH (Pʹ͓͍ͯͷ"3σβΠϯ ▸ 5BCMF'VODUJPO ▸ 5BCMF3PX4USVDU ▸ 5BCMF3PXT4MJDF
▸ %PNBJO-PHJD.FUIPE ͘͢ͳ͘ͱɺ(PSNʹ͓͍ͯ͜͏ͩ
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(P$POGFSFODF4QSJOH u := User{Name: "linyows"} db.Save(&u) (Pʹ͓͍ͯͷ"3σβΠϯ ECίωΫγϣϯ͔ΒσʔλΛอଘ͢Δ ߏମͨͩͷೖΕͳͷͰɺવΫϥεͷΑ͏ʹৼΔ͑ͳ͍
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σβΠϯͱͯ͠ͳͦ͞͏ (P$POGFSFODF4QSJOH
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͋ΒͨΊͯ(Pͷݴޠ༷Λ֬ೝ (P$POGFSFODF4QSJOH
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(P$POGFSFODF4QSJOH
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ΑΓॏཁͳΞΠσΞίϯηϓτͷɻ σʔλͱৼΔ͍ɺ(PͷͭͷҟͳΔίϯηϓτͰ͋Γɺ ʮΫϥεʯͱ͍͏୯Ұͷ֓೦ʹ·ͱΊΒΕ͍ͯͳ͍ɻ (P$POGFSFODF4QSJOH
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ͭ·Γɺ͜ͷݴޠ༷ͷҧ͍͕͋ΔʹؔΘΒͣɺ HPSNͷϝιουνΣʔϯςʔϒϧϚοϐϯά͕"3తͰɺ HPSNͷ͍ํΛޡͬͨํʹಋ͍͍ͯΔͷͰʁ (P$POGFSFODF4QSJOH
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(P$POGFSFODF4QSJOH DMBTT JOTUBODF WBSJBCMFT %#DPOOFDUJPO GVOD %# DPOOFDUJPO TUSVDU NFUIPE
6TFS 3VCZ (P ֤ίϯϙʔωϯτ͕͞ΕΞΫηε͍͢͠ Ϟσϧ Ϟσϧ
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(P$POGFSFODF4QSJOH 3BJMTͷ"DUJWF3FDPSEΕΑ͏ ▸ (Pͷ%#ίωΫγϣϯͱσʔλɺυϝΠϯϩδοΫͷΛϝ Ϧοτͱଊ͑Δ ▸ ແ༻ͷΧϓηϧԽ͠ͳ͍ ▸ ݺͼग़͠ଆʹॊೈੑΛ࣋ͨͤΔ
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(P$POGFSFODF4QSJOH package api func GetUserWithProfile(c echo.Context) error { n :=
c.Param("username") u, e := model.FindUserByUsernameWithProfile(n) if e != nil { return NewError(http.StatusNotFound, e, "not found") } return c.JSON(http.StatusOK, u)) } package model func FindUserByUsernameWithProfile(n string) (*User, error) { u := new(User) if err := db.Preload("Profile").Scopes(Enabled).Where("username = ?", n).First(u).Error; err != nil { return nil, err } return u, nil } มߋલ
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(P$POGFSFODF4QSJOH package api func GetUserWithProfile(c echo.Context) error { n :=
c.Param("username") u := new(model.User) if err := db.Preload("Profile").Scopes(Enabled).Where("username = ?", n).First(u).Error; err != nil { return NewError(http.StatusNotFound, e, "not found") } return c.JSON(http.StatusOK, f) } มߋޙ ͜Ε͚ͩʂϞσϧଆͷ࣮ແ͘ͳΓ·ͨ͠
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%#ૢ࡞(PSNʹͤΔ ˣ ͕͞ഉআ͞ΕεοΩϦ (P$POGFSFODF4QSJOH
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શͯ(PSNͷؾ࣋ͪ (P$POGFSFODF4QSJOH
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(P$POGFSFODF4QSJOH ৽ͨͳ՝ɿݺͼग़͠ଆʹࣅͨΑ͏ͳίʔυ͕૿͑ͳ͍ʁ 4DPQFTΛ͑େৎɺݺͼग़͠Λڞ௨Խ͢Δ͜ͱ͕Ͱ͖Δ 4DPQFɺ'VODUJPOͳͷͰϞσϧ໊Λ1SFpYʹ͢Δͱཧ͍͢͠ func UserGolden() func (db *gorm.DB) *gorm.DB
{ return func (db *gorm.DB) *gorm.DB { return db.Preload("Profile").Preload("Projects").Preload("Roles").Where("status = ?", "enabled") } } u := new(user) db.Scopes(UserGolden()).Find(u, 123)
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(P$POGFSFODF4QSJOH ·ͱΊ ▸ (PσʔλͱৼΔ͍Λ͍ͯ͠Δ͜ͱΛΕͳ͍ ▸ $MBTTੈքͷ"DUJWF3FDPSEͷ͜ͱΕΑ͏ ▸ (PSNͷ%#ίωΫγϣϯΛϞσϧʹΧϓηϧԽ͠ͳ͍ ▸ ͜ΕΒΛ౿·͑Είʔυ͕؆ૉԽ͢Δ
▸ ͦͯ͠4DPQF݁ߏ͑ΔΑ
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͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ (P$POGFSFODF4QSJOH
linyows
linyows
reverentgeek
rmw
skipperchong
carmenhchung
keathley
productmarketing
clairelew
thoeni
jcasabona
