英文:
How to set struct field using base type in Go
问题
如果我定义了一个类型 type myInt64 int64，我该如何使用反射来设置它？以下是代码，但是会导致 panic：reflect.Set: value of type int64 is not assignable to type main.myInt64。
package mainimport ("fmt""reflect")type myInt64 int64type MyStruct struct {Name stringAge myInt64}func FillStruct(m map[string]interface{}, s interface{}) error {structValue := reflect.ValueOf(s).Elem()for name, value := range m {structFieldValue := structValue.FieldByName(name)val := reflect.ValueOf(value)structFieldValue.Set(val)}return nil}func main() {myData := make(map[string]interface{})myData["Name"] = "Tony"myData["Age"] = int64(23)result := &MyStruct{}err := FillStruct(myData, result)if err != nil {fmt.Println(err)}fmt.Println(result)}
英文:
If I defined a type type myInt64 int64 how would I set it using reflection? Code below panics reflect.Set: value of type int64 is not assignable to type main.myInt64
http://play.golang.org/p/scsXq4ofk6
package mainimport ("fmt""reflect")type myInt64 int64type MyStruct struct {Name stringAge myInt64}func FillStruct(m map[string]interface{}, s interface{}) error {structValue := reflect.ValueOf(s).Elem()for name, value := range m {structFieldValue := structValue.FieldByName(name)val := reflect.ValueOf(value)structFieldValue.Set(val)}return nil}func main() {myData := make(map[string]interface{})myData["Name"] = "Tony"myData["Age"] = int64(23)result := &MyStruct{}err := FillStruct(myData, result)if err != nil {fmt.Println(err)}fmt.Println(result)}
答案1
得分: 7
你必须为赋值提供正确的类型。没有隐式类型转换。
你可以在函数中提供一个 myInt64：
myData := make(map[string]interface{})myData["Name"] = "Tony"myData["Age"] = myInt64(23)
http://play.golang.org/p/sbOdAnbz8n
或者你可以在赋值过程中进行值的转换：
for name, value := range m {structFieldValue := structValue.FieldByName(name)fieldType := structFieldValue.Type()val := reflect.ValueOf(value)structFieldValue.Set(val.Convert(fieldType))}
http://play.golang.org/p/kl0fEENY9b
英文:
You have to provide the correct type for the assignment. There are no implicit type conversions.
You can either provide a myInt64 to your function
myData := make(map[string]interface{})myData["Name"] = "Tony"myData["Age"] = myInt64(23)
http://play.golang.org/p/sbOdAnbz8n
Or you can convert the values during assignment
for name, value := range m {structFieldValue := structValue.FieldByName(name)fieldType := structFieldValue.Type()val := reflect.ValueOf(value)structFieldValue.Set(val.Convert(fieldType))}
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