fix: validateMap invalid err msgs

_examples/map-validation/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+
 	"github.com/go-playground/validator/v10"
 )
 

errors.go

@@ -208,7 +208,13 @@ func (fe *fieldError) StructNamespace() string {
 // field's actual name.
 func (fe *fieldError) Field() string {
 
-	return fe.ns[len(fe.ns)-int(fe.fieldLen):]
+	nsLength, fieldLength := len(fe.ns), int(fe.fieldLen)
+
+	if fieldLength == 0 {
+		return fe.ns
+	}
+
+	return fe.ns[nsLength-fieldLength:]
 	// // return fe.field
 	// fld := fe.ns[len(fe.ns)-int(fe.fieldLen):]
 

validator_instance.go

@@ -172,7 +172,7 @@ func (v Validate) ValidateMapCtx(ctx context.Context, data map[string]interface{
 				errs[field] = errors.New("The field: '" + field + "' is not a map to dive")
 			}
 		} else if ruleStr, ok := rule.(string); ok {
-			err := v.VarCtx(ctx, data[field], ruleStr)
+			err := v.VarCtx(ctx, data[field], ruleStr, field)
 			if err != nil {
 				errs[field] = err
 			}
@@ -609,7 +609,7 @@ func (v *Validate) StructExceptCtx(ctx context.Context, s interface{}, fields ..
 // You will need to assert the error if it's not nil eg. err.(validator.ValidationErrors) to access the array of errors.
 // validate Array, Slice and maps fields which may contain more than one error
 func (v *Validate) Var(field interface{}, tag string) error {
-	return v.VarCtx(context.Background(), field, tag)
+	return v.VarCtx(context.Background(), field, tag, "")
 }
 
 // VarCtx validates a single variable using tag style validation and allows passing of contextual
@@ -626,7 +626,7 @@ func (v *Validate) Var(field interface{}, tag string) error {
 // It returns InvalidValidationError for bad values passed in and nil or ValidationErrors as error otherwise.
 // You will need to assert the error if it's not nil eg. err.(validator.ValidationErrors) to access the array of errors.
 // validate Array, Slice and maps fields which may contain more than one error
-func (v *Validate) VarCtx(ctx context.Context, field interface{}, tag string) (err error) {
+func (v *Validate) VarCtx(ctx context.Context, field interface{}, tag, keyName string) (err error) {
 	if len(tag) == 0 || tag == skipValidationTag {
 		return nil
 	}
@@ -636,7 +636,7 @@ func (v *Validate) VarCtx(ctx context.Context, field interface{}, tag string) (e
 	vd := v.pool.Get().(*validate)
 	vd.top = val
 	vd.isPartial = false
-	vd.traverseField(ctx, val, val, vd.ns[0:0], vd.actualNs[0:0], defaultCField, ctag)
+	vd.traverseField(ctx, val, val, []byte(keyName), vd.actualNs[0:0], defaultCField, ctag)
 
 	if len(vd.errs) > 0 {
 		err = vd.errs

validator_test.go

@@ -2230,7 +2230,7 @@ func TestSQLValue2Validation(t *testing.T) {
 	AssertError(t, errs, "", "", "", "", "required")
 
 	val.Name = "Valid Name"
-	errs = validate.VarCtx(context.Background(), val, "required")
+	errs = validate.Var(val, "required")
 	Equal(t, errs, nil)
 
 	val.Name = "errorme"
@@ -12286,3 +12286,47 @@ func TestMultiOrOperatorGroup(t *testing.T) {
 		}
 	}
 }
+
+func TestValidate_ValidateMapCtxErrorMessage(t *testing.T) {
+	type args struct {
+		data   map[string]interface{}
+		rules  map[string]interface{}
+		errors map[string]interface{}
+	}
+	tests := []struct {
+		name string
+		args args
+	}{
+		{
+			name: "invalid_email",
+			args: args{
+				data: map[string]interface{}{
+					"email_address": "example.",
+				},
+				rules: map[string]interface{}{
+					"email_address": "omitempty,required,email",
+				},
+				errors: map[string]interface{}{
+					"email_address": "Key: 'email_address' Error:Field validation for 'email_address' failed on the 'email' tag",
+				},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			validate := New()
+			got := validate.ValidateMapCtx(context.Background(), test.args.data, test.args.rules)
+			for key, err := range got {
+				fieldErrors, ok := err.(ValidationErrors)
+				if !ok {
+					t.Errorf("failed to get underlying value of interface")
+				}
+				if test.args.errors[key] != fieldErrors[0].Error() {
+					t.Errorf("\nwanted: '%v' \ngot: '%v' \n", test.args.errors[key], err)
+				}
+
+			}
+		})
+	}
+}