英文:
Go parse JSON array of array
问题
我有这样的数据
"descriptionMap": [[[1,2], "a"], [[3,4], "b"]]
我试图用以下方式解码它
DescriptionMap []struct {OpcodeTableIdPair []intOpcodeDescription string} `json:"descriptionMap"`
但是我一直得到空数组
[[{[] } {[] }]]
英文:
I have data like this
"descriptionMap": [[[1,2], "a"], [[3,4], "b"]]
and I was trying to decode it with
DescriptionMap []struct {OpcodeTableIdPair []intOpcodeDescription string} `json:"descriptionMap"`
but I keep on getting empty arrays,
[[{[] } {[] }]]
答案1
得分: 3
你有一个非常不幸的JSON模式，将数组视为对象。在这种情况下，你可以尝试以下方法：
type Body struct {DescriptionMap []Description `json:"descriptionMap"`}type Description struct {IDPair []intDescription string}func (d *Description) UnmarshalJSON(b []byte) error {arr := []interface{}{}err := json.Unmarshal(b, &arr)if err != nil {return err}idPair := arr[0].([]interface{})d.IDPair = make([]int, len(idPair))for i := range idPair {d.IDPair[i] = int(idPair[i].(float64))}d.Description = arr[1].(string)return nil}
请注意，如果JSON中的任何类型不匹配，这段代码将会引发panic。你可以创建一个更好的版本，在这种情况下返回错误。
英文:
You have a very unfortunate JSON schema which treats arrays as objects. The best you can do in this situation is something like this:
type Body struct {DescriptionMap []Description `json:"descriptionMap"`}type Description struct {IDPair []intDescription string}func (d *Description) UnmarshalJSON(b []byte) error {arr := []interface{}{}err := json.Unmarshal(b, &arr)if err != nil {return err}idPair := arr[0].([]interface{})d.IDPair = make([]int, len(idPair))for i := range idPair {d.IDPair[i] = int(idPair[i].(float64))}d.Description = arr[1].(string)return nil}
Playground: https://play.golang.org/p/MPho12GJfc.
Notice though that this will panic if any of the types in the JSON don't match. You can create a better version which returns errors in such cases.
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