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

assertNotDeleted.go

package customer

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

func assertNotDeleted(currentState currentState) error {
    if currentState.isDeleted {
        return errors.Mark(errors.New("customer was deleted"), shared.ErrNotFound)
    }

    return nil
}