自定义 JSON 结构解组

Question

I'm using an API that returns the result as the name of the object and I am trying to unmarshal just the fields of the struct. Here is an example of the JSON:

{
  "AAPL": {
   "symbol": "AAPL",
    "description": "Apple Inc. - Common Stock",
    "lastPrice": 284.45,
    "openPrice": 284.69,
    "highPrice": 284.89,
    "lowPrice": 282.9197,
  }
}

You can see it is using "AAPL" as the name of the struct and I'm not sure how to unmarshal it. I'm looking to unmarshal into this struct:

type Quote struct {
    Symbol                    string  `json:"symbol"`
    Description               string  `json:"description"`
    LastPrice                 float64 `json:"lastPrice"`
    OpenPrice                 int     `json:"openPrice"`
    HighPrice                 int     `json:"highPrice"`
    LowPrice                  int     `json:"lowPrice"`
}

I assume I need to write a custom unmarshal func

func (q *Quote) UnmarshalJSON(b []byte) error {
...
}

I'm not sure of the contents. Any assistance is appreciated!

Answer 1

I think you are looking for json:"-".

https://golang.org/pkg/encoding/json/#Marshal

As a special case, if the field tag is "-", the field is always omitted. Note that a field with name "-" can still be generated using the tag "-,".