英文:
Read top level struct tags
问题
如何从Go中的结构字段中获取标签？我有一个嵌套的结构，我想将其作为参数传递给另一个函数，并在那里读取标签。我知道可以通过将其作为字段访问来实现，但我正在寻找一种方法来实现。
type MyStruct struct {
Nested struct{} `bson:"nested"`
}
func main() {
val := reflect.ValueOf(MyStruct{})
val.Type().Field(0).Tag.Get("bson") // 我想避免这种方式
val := reflect.ValueOf(MyStruct{}.Nested)
val.Tag???
}
英文:
How to get the tags from a struct field in Go? I have a nested struct which I want to pass as an argument to another function and read the tags there. I know that by accessing it as a field is possible, but I am searching for a way to it.
type MyStruct struct {
Nested struct{} `bson:"nested"`
}
func main() {
val := reflect.ValueOf(MyStruct{})
val.Type().Field(0).Tag.Get("bson") // I want to avoid this
val := reflect.ValueOf(MyStruct{}.Nested)
val.Tag???
}
答案1
得分: 1
你想要访问的标签属于MyStruct。如果你传递Nested字段的值，会创建一个完全与MyStruct分离的副本。无法确定传递的值是来自MyStruct的字段，还是来自另一个结构体，或者来自其他任何来源（例如复合字面量）。所以这是不可能的。
英文:
The tag you want to access belongs to MyStruct. If you pass the value of the Nested field, a copy is made which will be completely detached from MyStruct. There's no way to tell if the value passed originates from a field of MyStruct or from another struct, or from any other source (e.g. from a composite literal). So this is not possible.
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