When the nested structure has the same name field, the resolution skips the same name field of the substructure

binding/form_mapping.go

@@ -78,11 +78,23 @@ func mappingByPtr(ptr interface{}, setter setter, tag string) error {
 	return err
 }
 
-func mapping(value reflect.Value, field reflect.StructField, setter setter, tag string) (bool, error) {
+type structInfo struct {
+	value reflect.Value
+	field reflect.StructField
+}
+
+func mapping(value reflect.Value, field reflect.StructField, setter setter, tag string, maped ...map[string]struct{}) (bool, error) {
 	if field.Tag.Get(tag) == "-" { // just ignoring this field
 		return false, nil
 	}
 
+	var _maped map[string]struct{}
+	if len(maped) > 0 {
+		_maped = maped[0]
+	} else {
+		_maped = make(map[string]struct{})
+	}
+
 	vKind := value.Kind()
 
 	if vKind == reflect.Ptr {
@@ -92,7 +104,7 @@ func mapping(value reflect.Value, field reflect.StructField, setter setter, tag
 			isNew = true
 			vPtr = reflect.New(value.Type().Elem())
 		}
-		isSet, err := mapping(vPtr.Elem(), field, setter, tag)
+		isSet, err := mapping(vPtr.Elem(), field, setter, tag, _maped)
 		if err != nil {
 			return false, err
 		}
@@ -116,22 +128,59 @@ func mapping(value reflect.Value, field reflect.StructField, setter setter, tag
 		tValue := value.Type()
 
 		var isSet bool
+		structs := make([]structInfo, 0)
 		for i := 0; i < value.NumField(); i++ {
 			sf := tValue.Field(i)
 			if sf.PkgPath != "" && !sf.Anonymous { // unexported
 				continue
 			}
-			ok, err := mapping(value.Field(i), sf, setter, tag)
+			tagValue := sf.Tag.Get(tag)
+			if _, ok := _maped[tagValue]; ok {
+				continue
+			}
+
+			if isStruct(value.Field(i)) {
+				structs = append(structs, structInfo{
+					value: value.Field(i),
+					field: sf,
+				})
+				continue
+			}
+			ok, err := mapping(value.Field(i), sf, setter, tag, _maped)
 			if err != nil {
 				return false, err
 			}
 			isSet = isSet || ok
+
+			if isSet && tagValue != "" {
+				_maped[tagValue] = struct{}{}
+			}
+		}
+		for _, st := range structs {
+			ok, err := mapping(st.value, st.field, setter, tag, _maped)
+			if err != nil {
+				return false, err
+			}
+			isSet = isSet || ok
+			tagValue := st.field.Tag.Get(tag)
+			if isSet && tagValue != "" {
+				_maped[tagValue] = struct{}{}
+			}
 		}
 		return isSet, nil
 	}
 	return false, nil
 }
 
+func isStruct(_field reflect.Value) bool {
+	if _field.Kind() == reflect.Ptr {
+		vPtr := reflect.New(_field.Type().Elem())
+		return vPtr.Elem().Kind() == reflect.Struct
+	} else {
+		return _field.Kind() == reflect.Struct
+	}
+}
+
 type setOptions struct {
 	isDefaultExists bool
 	defaultValue    string

binding/form_mapping_test.go

@@ -288,3 +288,56 @@ func TestMappingIgnoredCircularRef(t *testing.T) {
 	err := mappingByPtr(&s, formSource{}, "form")
 	assert.NoError(t, err)
 }
+
+func TestMappingNestedStructure(t *testing.T) {
+	formData := formSource{"name": {"hello"}, "id": {"1"}, "age": {"18"}}
+	type Other struct {
+		Name string `form:"name"`
+	}
+	type City struct {
+		Id        int    `form:"id"`
+		Name      string `form:"name"`
+		OtherInfo *Other
+	}
+	type User struct {
+		Id       int    `form:"id"`
+		Name     string `form:"name"`
+		Age      int    `form:"age"`
+		CityInfo *City
+	}
+	var u User
+	err := mappingByPtr(&u, formData, "form")
+	assert.NoError(t, err)
+	assert.Equal(t, u.Id, 1)
+	assert.Equal(t, u.Name, "hello")
+	assert.Nil(t, u.CityInfo)
+
+	type User1 struct {
+		CityInfo *City
+		Id       int    `form:"id"`
+		Name     string `form:"name"`
+		Age      int    `form:"age"`
+	}
+	var u1 User1
+
+	err = mappingByPtr(&u1, formData, "form")
+	assert.NoError(t, err)
+	assert.Equal(t, u1.Id, 1)
+	assert.Equal(t, u1.Name, "hello")
+	assert.Nil(t, u1.CityInfo)
+
+	type User2 struct {
+		CityInfo City
+		Id       int    `form:"id"`
+		Name     string `form:"name"`
+		Age      int    `form:"age"`
+	}
+	var u2 User2
+
+	err = mappingByPtr(&u2, formData, "form")
+	assert.NoError(t, err)
+	assert.Equal(t, u2.Id, 1)
+	assert.Equal(t, u2.Name, "hello")
+	assert.Equal(t, u2.CityInfo.Id, 0)
+	assert.Equal(t, u2.CityInfo.Name, "")
+}