英文:
Unmarshalling XML attributes into a named, nested struct
问题
从当前的XML元素中解组属性到一个匿名结构体中是可行的：
package main
import (
"encoding/xml"
"fmt"
)
type Attrs struct {
Attr1 int `xml:"attr1,attr"`
Attr2 int `xml:"attr2,attr"`
}
type Element struct {
Attrs
}
func main() {
data := `<element attr1="1" attr2="2"></element>`
v := Element{}
err := xml.Unmarshal([]byte(data), &v)
if err != nil {
fmt.Printf("error: %v", err)
return
}
fmt.Printf("%#v\n", v)
}
这将按预期打印出 main.Element{Attrs:main.Attrs{Attr1:1, Attr2:2}}。
如果给匿名结构体成员命名，v.Attr1 和 v.Attr2 将无法解组。
type Element struct {
AttrGroup Attrs
}
在这种情况下，应该使用什么正确的标签？
英文:
Unmarshalling attributes from the current XML element into an anonymous struct works:
package main
import (
"encoding/xml"
"fmt"
)
type Attrs struct {
Attr1 int `xml:"attr1,attr"`
Attr2 int `xml:"attr2,attr"`
}
type Element struct {
Attrs
}
func main() {
data := `<element attr1="1" attr2="2"></element>`
v := Element{}
err := xml.Unmarshal([]byte(data), &v)
if err != nil {
fmt.Printf("error: %v", err)
return
}
fmt.Printf("%#v\n", v)
}
This prints main.Element{Attrs:main.Attrs{Attr1:1, Attr2:2}} as expected.
If the anonymous struct member is given a name, v.Attr1 and v.Attr2 are not unmarshalled.
type Element struct {
AttrGroup Attrs
}
What's the correct tag to use on the struct member in this case?
Edit: Playground version
答案1
得分: 1
为什么不直接这样做呢？我不明白命名的结构体除了复杂性之外还能带来什么好处。
package main
import (
"encoding/xml"
"fmt"
)
type Element struct {
Attr1 int `xml:"attr1,attr"`
Attr2 int `xml:"attr2,attr"`
}
func main() {
data := `<element attr1="1" attr2="2"></element>`
v := Element{}
err := xml.Unmarshal([]byte(data), &v)
if err != nil {
fmt.Printf("error: %v", err)
return
}
fmt.Printf("%#v\n", v)
}
输出结果为
main.Element{Attr1:1, Attr2:2}
英文:
Why not just do this? I don't see what the named struct buys you other than complexity.
package main
import (
"encoding/xml"
"fmt"
)
type Element struct {
Attr1 int `xml:"attr1,attr"`
Attr2 int `xml:"attr2,attr"`
}
func main() {
data := `<element attr1="1" attr2="2"></element>`
v := Element{}
err := xml.Unmarshal([]byte(data), &v)
if err != nil {
fmt.Printf("error: %v", err)
return
}
fmt.Printf("%#v\n", v)
}
Which prints
main.Element{Attr1:1, Attr2:2}
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