使用Go解析复杂的JSON

Question

I'm having issues digesting some nested JSON with Go. My primary issue is that I can't model my struct correctly to try and get the library to pull any information in. Here is a sample of the JSON data: http://pastebin.com/fcGQqi5z

The data is from a bank and has been scrubbed for privacy. Ideally I'm only interested in the transactions ID, the amount, and the description. Is there a way to just pull these values with Go?

This was my initial attempt:

type Trans struct {
  TransId string
  Amount int
  Description string
}

Answer 1

You were on the right tracks:

type Trans struct {
    TransId     string
    Amount      float64
    Description string
}

func main() {
    var data struct {
        Record []Trans
    }
    if err := json.Unmarshal([]byte(j), &data); err != nil {
        fmt.Println(err)
        return
    }
    fmt.Printf("%#v
", data.Record)
}

<kbd>playground</kbd>

//edit

type Trans struct {
    TransId     string
    Amount      float64
    Description string
    RawInfo     []map[string]json.RawMessage `json:"AdditionalInfo"`
}

// also this assumes that 1. all data are strings and 2. they have unique keys
// if this isn't the case, you can use map[string][]string or something
func (t *Trans) AdditionalInfo() (m map[string]string) {
    m = make(map[string]string, len(t.RawInfo))
    for _, info := range t.RawInfo {
        for k, v := range info {
            m[k] = string(v)
        }
    }
    return
}

<kbd>playground</kbd>