去解组JSON，但解组嵌套结构作为字符串

Question

Given the following JSON object:

{
"a": 1,
"b": [1,2,3,4]
}

And the following type:

type Thing struct {
  A Int `json:"a"`
  B string `json:"b"
}

I would like the Array "b" to stay as a JSON string when marshalled into go.

I currently get the following error:

panic: json: cannot unmarshal array into Go struct field Thing.b of type string

Answer 1

Set the field as a json.RawMessage. It'll be stored as is, without interpretation (ie. as "[1,2,3,4]"), as a slice of bytes, which can be converted to a string easily enough.

If you need a string directly, you'll have to implement the json.Unmarshaler interface on your type and do the conversion yourself.