added new option for transform error

Author: dimacgka

go.mod

@@ -6,7 +6,6 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/insei/fmap/v3 v3.1.1
 	github.com/stretchr/testify v1.9.0
-	golang.org/x/exp v0.0.0-20240808152545-0cdaa3abc0fa
 	gopkg.in/yaml.v3 v3.0.1
 )
 

go.sum

@@ -8,8 +8,6 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-golang.org/x/exp v0.0.0-20240808152545-0cdaa3abc0fa h1:ELnwvuAXPNtPk1TJRuGkI9fDTwym6AYBu0qzT8AcHdI=
-golang.org/x/exp v0.0.0-20240808152545-0cdaa3abc0fa/go.mod h1:akd2r19cwCdwSwWeIdzYQGa/EZZyqcOdwWiwj5L5eKQ=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

helper.go

@@ -13,6 +13,7 @@ import (
 type helper struct {
 	t                translator.Translator
 	getFieldLocation func(field fmap.Field) string
+	transformError   func(errs []shared.Error) []error
 }
 
 // ErrorT returns a shared.Error with the given location, message, and value.

options.go

@@ -3,6 +3,7 @@ package valigo
 import (
 	"github.com/insei/fmap/v3"
 
+	"github.com/insei/valigo/shared"
 	"github.com/insei/valigo/translator"
 )
 
@@ -40,3 +41,10 @@ func WithFieldLocationNamingFn(fn func(field fmap.Field) string) Option {
 		}
 	})
 }
+
+// WithErrorsTransformer returns an Option that sets the transformer for the Validator.
+func WithErrorsTransformer(fn func(errs []shared.Error) []error) Option {
+	return optionFunc(func(v *Validator) {
+		v.helper.transformError = fn
+	})
+}

options_test.go

@@ -1,10 +1,12 @@
 package valigo
 
 import (
+	"fmt"
 	"testing"
 
 	"github.com/insei/fmap/v3"
 
+	"github.com/insei/valigo/shared"
 	"github.com/insei/valigo/translator"
 )
 
@@ -78,3 +80,21 @@ func TestOptionApplyWithMultipleOptions(t *testing.T) {
 		t.Errorf("expected getFieldLocation to be set")
 	}
 }
+
+func TestWithMultipleOptionsWithErrorsTransformer(t *testing.T) {
+	transformer := func(errs []shared.Error) []error {
+		var newErrs []error
+		for _, err := range errs {
+			newErrs = append(newErrs, fmt.Errorf("test: %v", err))
+		}
+		return newErrs
+	}
+	opt := WithErrorsTransformer(transformer)
+
+	v := New(opt)
+	opt.apply(v)
+
+	if v.helper.transformError == nil {
+		t.Errorf("expected transformError to be set")
+	}
+}

validator.go

@@ -36,6 +36,9 @@ func (v *Validator) Validate(ctx context.Context, obj any) []error {
 	for i, err := range errsTyped {
 		errs[i] = err
 	}
+	if v.helper.transformError != nil {
+		return v.helper.transformError(errsTyped)
+	}
 	return errs
 }
 

validator_test.go

@@ -2,6 +2,7 @@ package valigo
 
 import (
 	"context"
+	"fmt"
 	"reflect"
 	"regexp"
 	"testing"
@@ -150,10 +151,11 @@ func TestValidatorValidateTyped(t *testing.T) {
 
 func TestValidatorValidate(t *testing.T) {
 	tests := []struct {
-		name         string
-		obj          any
-		validator    func(ctx context.Context, h shared.Helper, obj any) []shared.Error
-		expectedErrs int
+		name           string
+		obj            any
+		validator      func(ctx context.Context, h shared.Helper, obj any) []shared.Error
+		transformError func(errs []shared.Error) []error
+		expectedErrs   int
 	}{
 		{
 			name: "single error",
@@ -195,12 +197,24 @@ func TestValidatorValidate(t *testing.T) {
 			},
 			expectedErrs: 0,
 		},
+		{
+			name: "transform error",
+			obj:  struct{}{},
+			validator: func(ctx context.Context, h shared.Helper, obj any) []shared.Error {
+				return []shared.Error{{Message: "test error"}}
+			},
+			transformError: func(errs []shared.Error) []error {
+				return []error{fmt.Errorf("transformed error")}
+			},
+			expectedErrs: 1,
+		},
 	}
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
 			v := New()
 			v.storage.validators[reflect.TypeOf(test.obj)] = []structValidationFn{test.validator}
+			v.helper.transformError = test.transformError
 			errs := v.Validate(context.Background(), test.obj)
 			if len(errs) != test.expectedErrs {
 				t.Errorf("expected %d errors, got %d", test.expectedErrs, len(errs))