英文:
Catchall type for Golang API response
问题
我正在尝试定义一个可以容纳任意类型数组的结构体，如下所示：
type APIResponse struct {
length int
data []interface{}
}
我希望data属性能够容纳任意类型/结构体的数组，这样我就可以拥有一个单一的响应类型，最终将其序列化为JSON。所以我想要编写的代码类似于以下内容：
someStruct := getSomeStructArray()
res := &APIResponse{
length: len(someStruct),
data: someStruct,
}
enc, err := json.Marshal(res)
在Go语言中是否可能实现这个目标？我一直得到cannot use cs (type SomeType) as type []interface {} in assignment的错误。或者我必须为每种数据类型创建不同的响应类型？或者我完全错误地处理了这个问题，不符合Go语言的风格。非常感谢任何帮助！
英文:
I am trying to define a struct that can hold an array of any type like so:
type APIResonse struct {
length int
data []interface{}
}
I want the data property to be capable of holding an array of any type/struct so I can have a single response type, that will eventually be serialized to json. So what I want to be able to write is something like the following:
someStruct := getSomeStructArray()
res := &APIResponse{
length: len(someStruct),
data: someStruct,
}
enc, err := json.Marshal(res)
Is this possible in Go? I keep getting cannot use cs (type SomeType) as type []interface {} in assignment. Or do I have to create a different response type for every variation of data? Or maybe I am going about this wrong entirely / not Go-like. Any help would be much appreciated!
答案1
得分: 2
那段代码有几个问题。
你需要使用interface{}而不是[]interface{}，另外[]被称为切片，而数组是固定数量的元素，比如[10]string。
而且你的APIResponse字段没有被导出，所以json.Marshal不会输出任何内容。
func main() {
d := []dummy{{100}, {200}}
res := &APIResponse{
Length: len(d),
Data: d,
}
enc, err := json.Marshal(res)
fmt.Println(string(enc), err)
}
英文:
There are a couple of problems with that code.
You need to use interface{}, not []interface{}, also [] is called a slice, an array is a fixed number of elements like [10]string.
And your APIResponse fields aren't exported, so json.Marshal will not print out anything.
func main() {
d := []dummy{{100}, {200}}
res := &APIResponse{
Length: len(d),
Data: d,
}
enc, err := json.Marshal(res)
fmt.Println(string(enc), err)
}
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