🐛 Fix reflect HasField() with anonymous pointer field. (#736)

Signed-off-by: Jeff Ortel <[email protected]>

Author: jortel

reflect/fields.go

@@ -1,6 +1,7 @@
 package reflect
 
 import (
+	"fmt"
 	"reflect"
 	"time"
 
@@ -92,6 +93,18 @@ func NameOf(m any) (name string) {
 // - db.Omit()
 // - db.Select()
 func HasFields(m any, in ...string) (out []string, err error) {
+	defer func() {
+		p := recover()
+		if p != nil {
+			if pe, cast := p.(error); cast {
+				err = pe
+			} else {
+				err = fmt.Errorf(
+					"(paniced) failed: %#v",
+					p)
+			}
+		}
+	}()
 	mp := make(map[string]any)
 	var inspect func(r any)
 	inspect = func(r any) {
@@ -109,6 +122,10 @@ func HasFields(m any, in ...string) (out []string, err error) {
 			}
 			switch fv.Kind() {
 			case reflect.Ptr:
+				if ft.Anonymous {
+					inspect(fv.Interface())
+					continue
+				}
 				inst := fv.Interface()
 				mp[ft.Name] = inst
 			case reflect.Struct:

reflect/reflect_test.go

@@ -0,0 +1,72 @@
+package reflect
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/onsi/gomega"
+)
+
+func TestHasField(t *testing.T) {
+	g := gomega.NewGomegaWithT(t)
+	type B struct {
+		Name string
+		Age  string
+	}
+	type B2 struct {
+		Name2 string
+		Age2  string
+	}
+	type M struct {
+		B
+		*B2
+		Ptr    *B
+		Object B
+		Int    int
+		IntPtr *int
+		List   []string
+	}
+
+	// Test expected.
+	_, err := HasFields(
+		&M{B2: &B2{}},
+		"Name",
+		"Age",
+		"Name2",
+		"Age2",
+		"Ptr",
+		"Object",
+		"Int",
+		"IntPtr",
+		"List")
+	g.Expect(err).To(gomega.BeNil())
+
+	// Test anonymous NIL pointer.
+	_, err = HasFields(
+		&M{}, // PROBLEM HERE.
+		"Name",
+		"Age",
+		"Name2",
+		"Age2",
+		"Ptr",
+		"Object",
+		"Int",
+		"IntPtr",
+		"List")
+	g.Expect(err).ToNot(gomega.BeNil())
+
+	// Invalid field.
+	_, err = HasFields(
+		&M{B2: &B2{}},
+		"Name",
+		"Age",
+		"Name2",
+		"Age2",
+		"Ptr",
+		"NOT-VALID", // PROBLEM HERE
+		"Object",
+		"Int",
+		"IntPtr",
+		"List")
+	g.Expect(errors.Is(err, &FieldNotValid{})).To(gomega.BeTrue())
+}