问题描述
我有一个类似此演示的数据结构.
I have a data structure like this demo.
type Family struct {
first string
last string
}
type Person struct {
name string
family *Family
}
func main(){
per1 := Person{name:"niki",family:&Familys{first:"yam",last:"bari"}}
Check(per1)
}
和代码:
var validate *validator.Validate
func Check(data interface{}) {
var v = reflect.ValueOf(data)
if v.Kind() == reflect.Struct {
fmt.Println("was a struct")
v = v.FieldByName("family").FieldByName("last")
fmt.Println(v)
}
}
当我不为家庭使用Point时，它会返回"bari"并且可以.但是对于point来说，会出现此错误.
when i do not use point for Family , it back "bari" and it is ok.But with point , there is this error .
我搜索了很多，但找不到答案可以帮忙.
I searched a lot but i can not find answer can help.
推荐答案
您已经注意到，家庭是 *家庭.正如错误所言，您不能在 reflect.Value 上调用 .FieldByName(...)，其中该值是一个指针.
As you've noted, family is *Family. And as the error says, you cannot call .FieldByName(...) on a reflect.Value where that value is a pointer.
相反，您需要间接指针，以获取其指向的值，然后在其上调用 .FieldByName(...).
Instead you need to indirect the pointer, to get the value that it points to, and call .FieldByName(...) on that.
familyPtr := v.FieldByName("family")
v = reflect.Indirect(familyPtr).FieldByName("last")
请参阅间接文档: https://golang.org/pkg/reflect/#Indirect
这篇关于反射:在ptr值上调用reflect.Value.FieldByName的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！