Example for my iDDD with Go blog article series at https://medium.com/@TonyBologni

CustomerID.go

package value

import (
    "github.com/AntonStoeckl/go-iddd/service/shared"
    "github.com/cockroachdb/errors"
    "github.com/google/uuid"
)

type CustomerID struct {
    value string
}

func GenerateCustomerID() CustomerID {
    return CustomerID{value: uuid.New().String()}
}

func BuildCustomerID(value string) (CustomerID, error) {
    if value == "" {
        err := errors.New("empty input for CustomerID")
        err = shared.MarkAndWrapError(err, shared.ErrInputIsInvalid, "BuildCustomerID")

        return CustomerID{}, err
    }

    id := CustomerID{value: value}

    return id, nil
}

func RebuildCustomerID(value string) CustomerID {
    return CustomerID{value: value}
}

func (id CustomerID) String() string {
    return id.value
}

func (id CustomerID) Equals(other CustomerID) bool {
    return id.String() == other.String()
}