如何在带有标签的Go中取消编组/ Marshall JSON？

Question

The JSON object:

{  
"foo_bar": "content"  
}

The code:

type PrettyStruct struct {
    Foo       string  `json: "foo_bar"`
}

func whatever(r *http.Request) {
    var req PrettyStruct

    if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
        // ...
    }

    log.Println(req)
}

This outputs simply:

{}  

Go isn't considering my tags when decoding the JSON object, so nothing is unmarshalled into the struct and every field stays with the zero-value.
If, in the JSON object, the field was called "foo" or "Foo", everything works normally.

I've tried the simple tag "foo_bar" and the following variations `json: foo_bar` and "json: foo_bar".

Any thoughs on what am I doing wrong?

Answer 1

It's silly.. but the space between the colon and the "foo_bar" is the problem. Try this:

type PrettyStruct struct {
    Foo       string  `json:"foo_bar"`
    //                     ^^^ no space here
}

Working example on the playground: http://play.golang.org/p/dEc_c0UAOC