英文:
Golang and yaml with dynamic schema
问题
我有一个具有动态模式的YAML结构，例如我可以有以下的yaml结构：
array:
- name: myvar
val: 1
- name: mymap
val: [ 1, 2]
Goyaml将yaml映射到Go结构体，该结构体应声明明确的类型。在这里，val可以是一个单独的数字，也可以是一个数组，甚至是一个映射。
对于这种情况，哪种解决方案是最好的？
英文:
I have a YAML structure with dynamic schema e.g. I can have the following yaml:
array:
- name: myvar
val: 1
- name: mymap
val: [ 1, 2]
Goyaml maps yaml to Go struct, which should declare definite type. Here, val is either a signle number, or an array or even a map.
Which is the best solution for this situation?
答案1
得分: 3
我决定添加一个显示类型断言而不是使用reflect包的答案。你可以决定哪个对你的应用程序更好。我个人更喜欢内置函数，而不是reflect包的复杂性。
var data = `
array:
- name: myvar
val: 1
- name: mymap
val: [1, 2]
`
type Data struct {
Array []struct {
Name string
Val interface{}
}
}
func main() {
d := Data{}
err := yaml.Unmarshal([]byte(data), &d)
if err != nil {
log.Fatal(err)
}
for i := range d.Array {
switch val := d.Array[i].Val.(type) {
case int:
fmt.Println(val) // 是整数
case []int:
fmt.Println(val) // 是 []int
case []string:
fmt.Println(val) // 是 []string
// ....你明白了
default:
log.Fatalf("未处理的类型: %+v\n", d.Array[i])
}
}
}
英文:
I decided to add an answer showing a type assertion instead of the reflect package. You can decide which is best for your application. I personally prefer the builtin functions over the complexity of the reflect package.
var data = `
array:
- name: myvar
val: 1
- name: mymap
val: [1, 2]
`
type Data struct {
Array []struct {
Name string
Val interface{}
}
}
func main() {
d := Data{}
err := yaml.Unmarshal([]byte(data), &d)
if err != nil {
log.Fatal(err)
}
for i := range d.Array {
switch val := d.Array[i].(type) {
case int:
fmt.Println(val) // is integer
case []int:
fmt.Println(val) // is []int
case []string:
fmt.Println(val) // is []string
// .... you get the idea
default:
log.Fatalf("Type unaccounted for: %+v\n", d.Array[i])
}
}
}
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