Support field prefix rewrites

logger/error.go

@@ -10,6 +10,7 @@ import (
 
 type ValidationError struct {
 	Root    error
+	Rewrite [2]string
 	Details validator.ValidationErrors
 }
 
@@ -53,6 +54,14 @@ func (e *ValidationError) Error() string {
 	return sb.String()
 }
 
+func (e *ValidationError) RewritePrefix(original, updated string) {
+	e.Rewrite = [2]string{original, updated}
+}
+
+func (e *ValidationError) RewritesPrefix() bool {
+	return e.Rewrite != [2]string{}
+}
+
 func unwrap(err error) error {
 	for errors.Unwrap(err) != nil {
 		err = errors.Unwrap(err)

logger/logger.go

@@ -82,7 +82,7 @@ func (l Logger) LogServiceError(w http.ResponseWriter, r *http.Request, e error)
 		}
 
 		for i := range g.Details {
-			f = append(f, apiField{Name: formatField(g.Details[i].StructNamespace())})
+			f = append(f, apiField{Name: prepareField(g, g.Details[i])})
 		}
 
 	case validator.ValidationErrors:
@@ -136,6 +136,23 @@ func (l Logger) Log(v logging.Severity, m string, f Fields) {
 	})
 }
 
+func prepareField(e *ValidationError, f validator.FieldError) string {
+	v := formatField(f.StructNamespace())
+	if e.RewritesPrefix() {
+		v = rewriteField(v, e.Rewrite)
+	}
+
+	return v
+}
+
+func rewriteField(f string, rewrite [2]string) string {
+	if strings.HasPrefix(f, rewrite[0]) {
+		return rewrite[1] + strings.TrimPrefix(f, rewrite[0])
+	}
+
+	return f
+}
+
 func formatField(f string) string {
 	p := strings.Split(f, ".")
 	for i := range p {