How to set isolation level

Question

I want to set isolation level to repeatable read. How do I achieve this using gorm orm for postgres.

Example code:

func CreateAnimals(db *gorm.DB) err {
  tx := db.Begin()
  // Note the use of tx as the database handle once you are within a transaction

  if err := tx.Create(&Animal{Name: "Giraffe"}).Error; err != nil {
     tx.Rollback()
     return err
  }

  if err := tx.Create(&Animal{Name: "Lion"}).Error; err != nil {
     tx.Rollback()
     return err
  }

  tx.Commit()
  return nil
}

Answer 1

I had exactly the same problem here:

func GetPageAfterUpdate(dp model.DbProvider, id int, update int, page *Page) (err error) {
  tx := dp.DB().Begin()

  err = tx.Exec(`set transaction isolation level repeatable read`).Error
  if err != nil {
    tx.Rollback()
    return
  }

And it is exactly gorm with pg.