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Become a gorm feeling and use gorm
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linyows
April 15, 2018
Programming
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18k
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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} 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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// SELECT * FROM users WHERE role = 'admin' OR role = 'super'; (PSNͷಛ (PͰ͍͠ϝιουνΣʔϯ ϝιουνΣʔϯͳͷͰಈతͳΫΤϦ࡞͕؆୯Ͱ͖Δ ϝιουνΣʔϯͷͨΊʹΤϥʔΛߏମʹೖΕ͍ͯΔ
(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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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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(P$POGFSFODF4QSJOH func FindUserByName(n string) *User, error { u := new(User)
if err := db. First(u, "name = ?", n).Error; err != nil { return nil, err } return u, nil } Ϟσϧͷཚཱؔɺϝιου1BSU ·͋ɺΓ͍ͨ͜ͱΘ͔Δ
(P$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
(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 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
(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 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
(P$POGFSFODF4QSJOH package api func GetUserWithProfile(c echo.Context) error { n :=
c.Param("username") u := new(model.User) if err := db.Preload("Profile").Scopes(Enabled).Where("username = ?", n).First(u).Error; err != nil { return NewError(http.StatusNotFound, e, "not found") } return c.JSON(http.StatusOK, f) } มߋޙ ͜Ε͚ͩʂϞσϧଆͷ࣮ແ͘ͳΓ·ͨ͠
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(P$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)
(P$POGFSFODF4QSJOH ·ͱΊ ▸ (PσʔλͱৼΔ͍Λ͍ͯ͠Δ͜ͱΛΕͳ͍ ▸ $MBTTੈքͷ"DUJWF3FDPSEͷ͜ͱΕΑ͏ ▸ (PSNͷ%#ίωΫγϣϯΛϞσϧʹΧϓηϧԽ͠ͳ͍ ▸ ͜ΕΒΛ౿·͑Είʔυ͕؆ૉԽ͢Δ
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