Decode Multiple JSON Fields into one in Golang

Question

I am working with an API that, frustratingly, has field names that vary for the same value. For example, one API response could look like this:

{
  "PersonFirstName": "John",
  "PersonLastName": "Smith"
}

while another looks like this:

{
  "FirstNm": "John",
  "LastNm": "Smith"
}

Suppose then I had a struct which I would like to decode my JSON to. It might look like this:

type Name struct {
    FirstName string
    LastName  string
}

Typically I would just be able to do the following if the API was consistent:

type Name struct {
    FirstName string `json:"PersonFirstName"`
    LastName  string `json:"PersonLastName"`
}

and then use the built-in JSON decoder to build the struct. When there are multiple field values like this, though, I don't know a clean way to decode the JSON into a struct. Any ideas?

Answer 1

用一个map[string]string。这是 Go 中的等效结构。您将它们视为结构，因为它们是对象，这是明智的做法。每当你看到属性名称的不同值时，这就是你的线索：映射是 Go 中数据的唯一合理表示。

如果您需要标准化/静态类型，请实现一个名为 的辅助函数NameFromMap(data map[string]string) (*Name, error)。将 switch 语句放在那里来处理键可以拥有的各种值。

编辑：您也可以UnmarshalJSON针对您的类型实现。您只需将我提到的这个 switch 语句放在那里即可。这是一个例子；如何解组 JSON？

我个人更喜欢我所说的第一种方法，因为这种抽象了我宁愿看到显式调用的步骤。