英文:
How to unmarshal a reflect.Value in Golang
问题
我得到了这个测试
func (t *DeviceTests) CreatePublicDevice() {registerRegularDevice := tester.TableTest{Method: "POST",Path: "/iot/devices",Status: http.StatusOK,Name: "CreatePublicDevice",Description: "register Regular Device has to return 200",Body: PublicDevice,}resp := registerRegularDevice.DoubleSpin(t.Test)log.Println(resp.(types.Device).ID)}
我想将这部分代码放在一个单独的包中，这样我就可以在不同的项目中重用。
func (test TableTest) DoubleSpin(t *testing.T) interface{} {actualBody := test.innnerSpin(t)log.Print(string(actualBody))thetype := reflect.TypeOf(test.Body)log.Println(thetype)receivedev := reflect.Zero(thetype)err := json.Unmarshal(actualBody, receivedev.Interface())assert.NoError(t, err)log.Println(receivedev)return receivedev.Interface()}
日志显示：
2016/11/06 16:54:01 {"id":"581f7c49b2c79a543c627474","hostname":"Shriekersolar","alias":"my PublicDevice","channels":8,"owner":"public","location":{}}2016/11/06 16:54:01 types.Device2016/11/06 16:54:01 {ObjectIdHex("") 0 map[]}2016/11/06 16:54:01 ObjectIdHex("")
设备的结构如下：
type Device struct {ID bson.ObjectId `json:"id" bson:"_id,omitempty"`Hostname string `json:"hostname"`Alias string `json:"alias"`Channels int `json:"channels"`Owner string `json:"owner"`Location map[string]string `json:"location"`}
英文:
I got this test
func (t *DeviceTests) CreatePublicDevice() {registerRegularDevice := tester.TableTest{Method: "POST",Path: "/iot/devices",Status: http.StatusOK,Name: "CreatePublicDevice",Description: "register Regular Device has to return 200",Body: PublicDevice,}resp := registerRegularDevice.DoubleSpin(t.Test)log.Println(resp.(types.Device).ID)}
I want to keep this in a separate package so I can reuse on diferent projects.
func (test TableTest) DoubleSpin(t *testing.T) interface{} {actualBody := test.innnerSpin(t)log.Print(string(actualBody))thetype := reflect.TypeOf(test.Body)log.Println(thetype)receivedev := reflect.Zero(thetype)err := json.Unmarshal(actualBody, receivedev.Interface())assert.NoError(t, err)log.Println(receivedev)return receivedev.Interface()}
Logs say:
2016/11/06 16:54:01 {"id":"581f7c49b2c79a543c627474","hostname":"Shriekersolar","alias":"my PublicDevice","channels":8,"owner":"public","location":{}}2016/11/06 16:54:01 types.Device2016/11/06 16:54:01 {ObjectIdHex("") 0 map[]}2016/11/06 16:54:01 ObjectIdHex("")
Where a device looks like:
type Device struct {ID bson.ObjectId `json:"id" bson:"_id,omitempty"`Hostname string `json:"hostname"`Alias string `json:"alias"`Channels int `json:"channels"`Owner string `json:"owner"`Location map[string]string `json:"location"`}
答案1
得分: 5
使用reflect.New而不是reflect.Zero来获取指针：
thetype := reflect.TypeOf(i)receivedev := reflect.New(thetype)err := json.Unmarshal(actualBody, receivedev.Interface())if err != nil {panic(err)}
Playground: https://play.golang.org/p/pGXRWpBFiF.
英文:
Use reflect.New rather than reflect.Zero to get a pointer:
thetype := reflect.TypeOf(i)receivedev := reflect.New(thetype)err := json.Unmarshal(actualBody, receivedev.Interface())if err != nil {panic(err)}
Playground: https://play.golang.org/p/pGXRWpBFiF.
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