我是 Go 的新手，但努力嘗試..我正在嘗試編寫一些邏輯，需要檢查 struct 的屬性是否僅包含一個元素，或者第一個元素只有一個子元素。主要結構是這樣的：type ChartOptins struct { Filters Filter `json:"filters"` Charts interface{} `json:"charts"`}圖表天生就是這樣的結構數組的組合： $filters = array( "filters" => array( "DayStart" => "12-01-2015", "DayEnd" => "12-05-2015", "TimePeriods"=> array( array("qqq","www"), ), "lines" => array( "first","avokado","drunduki" ) ), "charts" => array( "noagg" => array( array( "name" => "HOLD", "type" => "line" ), array( "name" => "UKKR", "type" => "line" ), array( "name" => "SVO", "type" => "line" ), ), "oracle" => array( array( "name" => "TDD", "type" => "line" ), ) ), );進入結構，ChartOptions我從 POST 請求解析 JSON。JSON 如下所示：{ "filters": { "dayStart": "11-10-2015", "dayEnd": "21-10-2015", "timePeriods": [ [ "qqq", "www" ] ], "lines": [ "first", "avokado", "drunduki" ] }, "charts": { "noagg": [ { "name": "HOLD", "type": "line" } ] } }所以 ,charts只能有 1 個源和 1 個元素，或者在任意數量的源中包含任意數量的元素。"charts" : { "noagg": [ { "name": "HOLD", "type": "line" } ] }or"charts" : { "noagg": [ { "name": "HOLD", "type": "line" } , { "name": "TDD", "type": "line" } , { "name": "SVO", "type": "line" } ] }當然，這是轉到腳本的 JSON 元素，我將它們解析為 interface{}。當我嘗試使用時len()，Go 說我不能在界面上使用它..處理元素數量的最佳實踐是什么，實現這種檢查的最佳方法是什么？
2 回答
守候你守候我
TA貢獻1802條經驗 獲得超10個贊
這是一個示例保持界面：https : //play.golang.org/p/Eu6Hj6ddSE
只要改變： Charts interface{}女巫Charts []interface{} 。接口上，如果v是你ChartOptins然后讓你用LEN（）運算符
fmt.Println(len(v.Charts.([]interface{})))
尚方寶劍之說
TA貢獻1788條經驗 獲得超4個贊
據我了解，您只需要定義用于正確映射 json 的結構。它可以是這樣的：
package main
import (
"encoding/json"
"fmt"
"strings"
)
type ChartOptins struct {
Filters map[string]interface{} `json:"filters"`
Charts map[string][]Chart `json:"charts"`
}
type Chart struct {
Name string `json:"name"`
Type string `json:"type"`
}
func main() {
const jsonStream = `{
"filters": { "dayStart": "oneortwo", "dayEnd": "oneorthree", "timePeriods": [ [ "qqq", "www" ] ], "lines": [ "first", "avokado", "drunduki" ] },
"charts": { "noagg": [ { "name": "HOLD", "type": "line" }, { "name": "UKKR", "type": "line" }, { "name": "SVO", "type": "line" } ], "oracle": [ { "name": "TDD", "type": "line" } ] }
}`
var co ChartOptins
json.NewDecoder(strings.NewReader(jsonStream)).Decode(&co)
fmt.Println(co)
for k, v := range co.Charts {
fmt.Printf("key: %v\n", k)
for _, ch := range v {
fmt.Printf("Name: %v, type: %v\n", ch.Name, ch.Type)
}
}
}
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