json - 如何展平嵌套的 JSON

Question

尝试将嵌套的 json 响应从 2 层深化到 1 层。

这是我在 Go Playground 上的工作代码:http://play.golang.org/p/kHAYuZUTko

我想结束:

type Social struct {
    GooglePlusPlusOnes  uint32 `Social:"GooglePlusOne"`
    TwitterTweets       uint32 `json:"Twitter"`
    LinkedinShares      uint32 `json:"LinkedIn"`
    PinterestPins       uint32 `json:"Pinterest"`
    StumbleuponStumbles uint32 `json:"StumbleUpon"`
    DeliciousBookmarks  uint32 `json:"Delicious"`
    FacebookLikes       uint32 `json:"??some_magical_nested_address??"`
    FacebookShares      uint32 `json:"??some_magical_nested_address??"`
    FacebookComments    uint32 `json:"??some_magical_nested_address??"`
    FacebookTotal       uint32 `json:"??some_magical_nested_address??"`
}

...而不是包含嵌套 Facebook 类型的 Social 类型(见下面的代码)。

我怀疑我需要执行自定义 UnmarshalJSON 函数，但我不知道它们是如何工作的，而且我是 Go 的新手。

建议？

---

这是来自 Go Playground link 的代码以上:

package main

import (
    "encoding/json"
    "fmt"
)

type Social struct {
    GooglePlusPlusOnes  uint32 `json:"GooglePlusOne"`
    TwitterTweets       uint32 `json:"Twitter"`
    LinkedinShares      uint32 `json:"LinkedIn"`
    PinterestPins       uint32 `json:"Pinterest"`
    StumbleuponStumbles uint32 `json:"StumbleUpon"`
    DeliciousBookmarks  uint32 `json:"Delicious"`
    Facebook            Facebook
}

type Facebook struct {
    FacebookLikes    uint32 `json:"like_count"`
    FacebookShares   uint32 `json:"share_count"`
    FacebookComments uint32 `json:"comment_count"`
    FacebookTotal    uint32 `json:"total_count"`
}

func main() {
    var jsonBlob = []byte(`[
        {"StumbleUpon":0,"Reddit":0,"Facebook":{"commentsbox_count":4691,"click_count":0,"total_count":298686,"comment_count":38955,"like_count":82902,"share_count":176829},"Delicious":0,"GooglePlusOne":275234,"Buzz":0,"Twitter":7346788,"Diggs":0,"Pinterest":40982,"LinkedIn":0}
    ]`)

    var social []Social
    err := json.Unmarshal(jsonBlob, &social)
    if err != nil {
        fmt.Println("error:", err)
    }
    fmt.Printf("%+v", social)
}

Answer 1

如果您只使用 map ，此功能将很有用。

// Flatten takes a map and returns a new one where nested maps are replaced
// by dot-delimited keys.
func Flatten(m map[string]interface{}) map[string]interface{} {
    o := make(map[string]interface{})
    for k, v := range m {
            switch child := v.(type) {
            case map[string]interface{}:
                    nm := Flatten(child)
                    for nk, nv := range nm {
                            o[k+"."+nk] = nv
                    }
            default:
                    o[k] = v
            }
    }
    return o
}