Model("User", func() {
	Description("This is the User model and describes a User as in any system")
	Composition("UserAddon")
	Field("id", gorma.UUID, func() {
		PrimaryKey()
		SQLTag("type:uuid")
		Description("This is the ID PK field")
	})
	Field("email", gorma.String)
})


type UserStorage interface {
	UserAddon  // Added by the use of "Composition" in DSL
	DB() interface{}
	List(ctx context.Context) []User
	Get(ctx context.Context, id uuid.UUID) (User, error)
	Add(ctx context.Context, user *User) (*User, error)
	Update(ctx context.Context, user *User) error
	Delete(ctx context.Context, id uuid.UUID) error
}