enhance #3221

os/gstructs/gstructs_field.go

@@ -92,9 +92,26 @@ func (f *Field) OriginalKind() reflect.Kind {
 		reflectType = reflectType.Elem()
 		reflectKind = reflectType.Kind()
 	}
+
 	return reflectKind
 }
 
+// OriginalValue retrieves and returns the original reflect.Value of Field `f`.
+func (f *Field) OriginalValue() reflect.Value {
+	var (
+		reflectValue = f.Value
+		reflectType  = reflectValue.Type()
+		reflectKind  = reflectType.Kind()
+	)
+
+	for reflectKind == reflect.Ptr && !f.IsNil() {
+		reflectValue = reflectValue.Elem()
+		reflectKind = reflectValue.Type().Kind()
+	}
+
+	return reflectValue
+}
+
 // IsEmpty checks and returns whether the value of this Field is empty.
 func (f *Field) IsEmpty() bool {
 	return empty.IsEmpty(f.Value)

util/gutil/gutil_struct.go

@@ -83,12 +83,20 @@ func FillStructWithDefault(structPtr interface{}) error {
 	}
 	fields, err := gstructs.Fields(gstructs.FieldsInput{
 		Pointer:         reflectValue,
-		RecursiveOption: gstructs.RecursiveOptionNone,
+		RecursiveOption: gstructs.RecursiveOptionEmbedded,
 	})
 	if err != nil {
 		return err
 	}
 	for _, field := range fields {
+		if field.OriginalKind() == reflect.Struct {
+			err := FillStructWithDefault(field.OriginalValue().Addr())
+			if err != nil {
+				return err
+			}
+			continue
+		}
+
 		if defaultValue := field.TagDefault(); defaultValue != "" {
 			if field.IsEmpty() {
 				field.Value.Set(reflect.ValueOf(
@@ -97,5 +105,6 @@ func FillStructWithDefault(structPtr interface{}) error {
 			}
 		}
 	}
+
 	return nil
 }

util/gutil/gutil_z_unit_struct_test.go

@@ -39,17 +39,44 @@ func Test_StructToSlice(t *testing.T) {
 
 func Test_FillStructWithDefault(t *testing.T) {
 	gtest.C(t, func(t *gtest.T) {
-		type A struct {
-			V1 int     `d:"1.01"`
-			V2 string  `d:"1.01"`
-			V3 float32 `d:"1.01"`
+		type myInt int
+		type Inner1 struct {
+			I1V1 int
+			I1V2 bool `d:"true"`
 		}
-		a := A{}
-		err := gutil.FillStructWithDefault(&a)
+		type Inner2 struct {
+			I2V1 float64 `d:"1.01"`
+		}
+		type Inner3 struct {
+			Inner1 Inner1
+			I3V1   myInt `d:"1"`
+		}
+		type Inner4 struct {
+		}
+		type Outer struct {
+			O1 int     `d:"1.01"`
+			O2 string  `d:"1.01"`
+			O3 float32 `d:"1.01"`
+			*Inner1
+			O4 bool `d:"true"`
+			Inner2
+			Inner3 Inner3
+			Inner4 *Inner4
+		}
+
+		outer := Outer{}
+		err := gutil.FillStructWithDefault(&outer)
 		t.AssertNil(err)
 
-		t.Assert(a.V1, `1`)
-		t.Assert(a.V2, `1.01`)
-		t.Assert(a.V3, `1.01`)
+		t.Assert(outer.O1, 1)
+		t.Assert(outer.O2, `1.01`)
+		t.Assert(outer.O3, `1.01`)
+		t.Assert(outer.O4, true)
+		t.Assert(outer.Inner1, nil)
+		t.Assert(outer.Inner2.I2V1, `1.01`)
+		t.Assert(outer.Inner3.I3V1, 1)
+		t.Assert(outer.Inner3.Inner1.I1V1, 0)
+		t.Assert(outer.Inner3.Inner1.I1V2, true)
+		t.Assert(outer.Inner4, nil)
 	})
 }