反序列化“ oneOf”结构的Json数组

Question

I have JSON documents that contain an array where each item is either a string or a map representing an object.

{"oneOfArray": ["str1", "str2", {"SomeStruct": "value3"}, "str4", {"SomeStruct": "value5"} ]}

How can I create Go classes that represent this kind of structure and provide deserialization via the json package?

Answer 1

There is no generic support in Go (yet), so you cannot create an array that would represent the different types of values coming from your JSON.

One way is use a slice of type []interface{} , and the encoding/json package will choose types itself to unmarshal into, which will be map[string]interface{} for JSON objects.

You may model the outer object with this type:

type Obj struct {
    OneOfArray []interface{} `json:"oneOfArray"`
}

Example unmarshaling your input:

src := `{"oneOfArray": ["str1", "str2", {"SomeStruct": "value3"}, "str4", {"SomeStruct": "value5"} ]}`

var obj Obj

if err := json.Unmarshal([]byte(src), &obj); err != nil {
    panic(err)
}
fmt.Println(obj)

Output (try it on the Go Playground ):

{[str1 str2 map[SomeStruct:value3] str4 map[SomeStruct:value5]]}