HasColumn(dst interface{}, field string) bool
	RenameColumn(dst interface{}, oldName, field string) error
	ColumnTypes(dst interface{}) ([]ColumnType, error)

	// Views
	CreateView(name string, option ViewOption) error
	DropView(name string) error

	// Constraints
	CreateConstraint(dst interface{}, name string) error
	DropConstraint(dst interface{}, name string) error
	HasConstraint(dst interface{}, name string) bool

	// Indexes

	if option.CheckOption != "" {
		sql.WriteString(" ")
		sql.WriteString(option.CheckOption)
	}
	return m.DB.Exec(m.Explain(sql.String(), m.DB.Statement.Vars...)).Error
}

// DropView drop view
func (m Migrator) DropView(name string) error {
	return m.DB.Exec("DROP VIEW IF EXISTS ?", clause.Table{Name: name}).Error
}

// GuessConstraintAndTable guess statement's constraint and it's table based on name
//

	}

	if err := DB.Migrator().DropView("users_pets"); err != nil {
		t.Fatalf("Failed to drop view, got %v", err)
	}

	query = DB.Model(&User{}).Where("age > ?", 20)
	if err := DB.Migrator().CreateView("users_view", gorm.ViewOption{Query: query}); err != nil {
		t.Fatalf("Failed to crate view, got %v", err)
	}
	if err := DB.Migrator().DropView("users_view"); err != nil {