# Change Log · GORM Guide

# Change Log

## v1.0

#### Breaking Changes

- `gorm.Open` return type `*gorm.DB` instead of `gorm.DB`

- Updating will only update changed fields

  Most applications won't be affected, only when you are changing updating values in callbacks like `BeforeSave`, `BeforeUpdate`, you should use `scope.SetColumn` then, for example:

      func (user *User) BeforeUpdate(scope *gorm.Scope) {
        if pw, err := bcrypt.GenerateFromPassword(user.Password, 0); err == nil {
          scope.SetColumn("EncryptedPassword", pw)
          // user.EncryptedPassword = pw  // doesn't work, won't including EncryptedPassword field when updating
        }
      }

- Soft Delete's default querying scope will only check `deleted_at IS NULL`

  Before it will check `deleted_at` less than `0001-01-02` also to exclude blank time, like:

  `SELECT * FROM users WHERE deleted_at IS NULL OR deleted_at <= '0001-01-02'`

  But it is not necessary if you are using type `*time.Time` for your model's `DeletedAt`, which has been used by `gorm.Model`, so below SQl is enough

  `SELECT * FROM users WHERE deleted_at IS NULL`

  So if you are using `gorm.Model`, then you are good, nothing need to be change, just make sure all records having blank time for `deleted_at` set to `NULL`, sample migrate script:

    import (
        "github.com/jinzhu/now"
    )

    func main() {
      var models = []interface{}{&User{}, &Image{}}
      for _, model := range models {
        db.Unscoped().Model(model).Where("deleted_at < ?", now.MustParse("0001-01-02")).Update("deleted_at", gorm.Expr("NULL"))
      }
    }

- New ToDBName logic

  Before when GORM convert Struct, Field's name to db name, only those common initialisms from golint like `HTTP`, `URI` are special handled.

  So field `HTTP`'s db name will be `http` not `h_t_t_p`, but some other initialisms like `SKU` that not in golint, it's db name will be `s_k_u`, which looks ugly, this release fixed this, any upper case initialisms should be converted correctly.

  If your applications using some upper case initialisms which doesn't exist in golint, you need to overwrite default column name with tag, like `gorm:"column:s_k_u"`, or alert your database's column name according to new logic

- Error `RecordNotFound` has been renamed to `ErrRecordNotFound`

- `mssql` driver has been moved out from default drivers, import it with `import _ "github.com/jinzhu/gorm/dialects/mssql"`

- `Hstore` has been moved to package `github.com/jinzhu/gorm/dialects/postgres`

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