英文:
Go unmarshal json with a field that is an array of objects or strings
问题
在Go语言中，你可以将JSON解组成一个结构体。问题是，我有一个API，它可能会在每个请求中更改键的值的类型。
例如，可能会有这样的内联对象：
{
"mykey": [
{obj1},
{obj2}
]
}
但也可能通过键指向对象，像这样：
{
"mykey": [
"/obj1/is/at/this/path",
"/obj2/is/at/this/other/path"
]
}
有些对象可以内联，但其他对象可能会在多个位置引用。
在JavaScript或Python中，这不是问题。只需检查类型即可。
在Go中，解组和解析这两个对象的惯用方式是什么？是反射（Reflect）是唯一的方式吗？
英文:
In go you unmarshal json into a struct. The problem is that I have an api that might change the type of the value of a key from request to request.
For example objects that might be inlined objects like this:
{
"mykey": [
{obj1},
{obj2}
]
}
but also point to objects by keys, like this:
{
"mykey": [
"/obj1/is/at/this/path",
"/obj2/is/at/this/other/path"
]
}
Some objects can be inlined, but others are referenced from multiple locations.
In javascript or python this wouldn't be a problem. Just check the type.
What's the go-idiomatic way to unmarshal and parse these two objects? Is Reflect the only way?
答案1
得分: 4
你可以将这个JSON解析为以下结构的形式：
type Data struct {
MyKey []interface{} `json:"mykey"`
}
如果JSON包含字符串，它们将被解码为数组中的字符串。如果JSON包含对象，它们将被解码为map[string]interface{}值。你可以使用type switch来区分这两种情况。类似这样：
for i, v := range data.MyKey {
switch x := v.(type) {
case string:
fmt.Println("得到一个字符串：", x)
case map[string]interface{}:
fmt.Printf("得到一个对象：%#v\n", x)
}
}
你可以在这里尝试这个示例：http://play.golang.org/p/PzwFI2FSav
英文:
You could unmarshal this JSON to a structure like the following:
type Data struct {
MyKey []interface{} `json:"mykey"`
}
If the JSON includes strings, they will be decoded as strings in the array. If the JSON includes objects, they will be decoded as map[string]interface{} values. You can distinguish between the two using a type switch. Something like this:
for i, v := range data.MyKey {
switch x := v.(type) {
case string:
fmt.Println("Got a string: ", x)
case map[string]interface{}:
fmt.Printf("Got an object: %#v\n", x)
}
}
You can play around with this example here: http://play.golang.org/p/PzwFI2FSav
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