return m.RunWithValue(value, func(stmt *gorm.Statement) error {
		// We're currently only receiving boolean values on `Unique` tag,
		// so the UniqueConstraint name is fixed
		constraint := m.DB.NamingStrategy.UniqueName(stmt.Table, field.DBName)
		if unique && !field.Unique {
			return m.DB.Migrator().DropConstraint(value, constraint)
		}
		if !unique && field.Unique {
			return m.DB.Migrator().CreateConstraint(value, constraint)

	// UniqueAffectedByUniqueIndex is true
	if DB.Dialector.Name() == "mysql" {
		uniqueConstraintIndex := &migrator.Index{TableName: table, NameValue: DB.Config.NamingStrategy.UniqueName(table, "name"), ColumnList: []string{"name"}, PrimaryKeyValue: sql.NullBool{Bool: false, Valid: true}, UniqueValue: sql.NullBool{Bool: true, Valid: true}}
		checkNotUnique = func(t *testing.T) {
			checkColumnType(t, "name", false)