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seeder.go
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seeder.go
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package gorm_seeder
import (
"fmt"
"gorm.io/gorm"
)
//SeederInterface interface
type SeederInterface interface {
Seed(db *gorm.DB) error
Clear(db *gorm.DB) error
}
//SeederConfiguration struct
type SeederConfiguration struct {
Rows int
}
//SeederAbstract struct
type SeederAbstract struct {
Configuration SeederConfiguration
}
//Delete method
func (sa *SeederAbstract) Delete(db *gorm.DB, table string) error {
sql := fmt.Sprintf("DELETE FROM %v", table)
return db.Exec(sql).Error
}
//Truncate method
func (sa *SeederAbstract) Truncate(db *gorm.DB, table string) error {
sql := fmt.Sprintf("TRUNCATE %v", table)
return db.Exec(sql).Error
}
//SeedersStack struct
type SeedersStack struct {
db *gorm.DB
seeders []SeederInterface
}
//AddSeeder method
func (ss *SeedersStack) AddSeeder(seeder SeederInterface) *SeedersStack {
ss.seeders = append(ss.seeders, seeder)
return ss
}
//Seed method
func (ss *SeedersStack) Seed() error {
tx := ss.beginTransaction(ss.db)
for _, seeder := range ss.seeders {
err := seeder.Seed(tx)
if err != nil {
ss.rollbackTransaction(tx)
return err
}
}
ss.commitTransaction(tx)
return nil
}
//Clear method
func (ss *SeedersStack) Clear() error {
tx := ss.beginTransaction(ss.db)
for _, seeder := range ss.seeders {
err := seeder.Clear(tx)
if err != nil {
ss.rollbackTransaction(tx)
return err
}
}
ss.commitTransaction(tx)
return nil
}
//beginTransaction method
func (ss *SeedersStack) beginTransaction(db *gorm.DB) *gorm.DB {
var tx *gorm.DB
if db.SkipDefaultTransaction {
tx = db.Begin()
} else {
tx = db
}
return tx
}
//commitTransaction method
func (ss *SeedersStack) commitTransaction(db *gorm.DB) *gorm.DB {
if db.SkipDefaultTransaction {
db.Commit()
}
return db
}
//rollbackTransaction method
func (ss *SeedersStack) rollbackTransaction(db *gorm.DB) *gorm.DB {
if db.SkipDefaultTransaction {
db.Rollback()
}
return db
}
//NewSeedersStack function
func NewSeedersStack(db *gorm.DB) *SeedersStack {
return &SeedersStack{db: db}
}
//NewSeederAbstract function
func NewSeederAbstract(cfg SeederConfiguration) SeederAbstract {
return SeederAbstract{Configuration: cfg}
}