从嵌套映射类型 map[string]interface{} 中获取值答案

【问题标题】：get value form nested map type map[string]interface{}从嵌套映射类型 map[string]interface{} 中获取值
【发布时间】：2017-12-11 18:24:00
【问题描述】：

我正在尝试从嵌套地图中获取所有价值，但我不知道该怎么做。

package main

import "fmt"

func main() {
    m := map[string]interface{}{
        "date":       "created",
        "clientName": "data.user.name",
        "address": map[string]interface{}{
            "street": "x.address",
        },
        "other": map[string]interface{}{
            "google": map[string]interface{}{
                "value": map[string]interface{}{
                    "x": "y.address",
                },
            },
        },
        "new_address": map[string]interface{}{
            "address": "z.address",
        },
    }

    for i := range m {
        fmt.Println(m[i])
        // how I can get value from other nested map?
    }
}

如何从其他嵌套地图中获取价值？

【问题讨论】：

Accessing Nested Map of Type map[string]interface{} in Golang的可能重复

标签： go

【解决方案1】：

您应该使用非恐慌强制转换为目标值。

for i := range m {
    nestedMap, ok := m[i].(map[string]interface{})
    if ok {
        // Do what you want
    }
}

【讨论】：

【解决方案2】：

灵感来自@BayRinat answer

package main

import "fmt"

func main() {
    m := map[string]interface{}{
        "date":       "created",
        "clientName": "data.user.name",
        "address": map[string]interface{}{
            "street": "x.address",
        },
        "other": map[string]interface{}{
            "google": map[string]interface{}{
                "value": map[string]interface{}{
                    "x": "g.address",
                },
            },
        },
        "new_address": map[string]interface{}{
            "address": "z.address",
        },
        "key1": map[string]interface{}{
            "key2": map[string]interface{}{
                "key3": map[string]interface{}{
                    "key4": map[string]interface{}{
                        "key5": map[string]interface{}{
                            "key6": map[string]interface{}{
                                "key7": map[string]interface{}{
                                    "key": "enough",
                                },
                            },
                        },
                    },
                },
            },
        },
    }

    for i := range m {
        nestedMap, ok := m[i].(map[string]interface{})
        if ok {
            fmt.Println("Key:", i)
            fmt.Println("Value:", getValNestedMap(nestedMap))
        } else {
            fmt.Println("Key:", i)
            fmt.Println("Value:", m[i])
        }
    }

}

func getValNestedMap(m map[string]interface{}) interface{} {
    for i := range m {
        nestedMap, ok := m[i].(map[string]interface{})
        if ok {
            return getValNestedMap(nestedMap)
        }
        return m[i]
    }

    return nil
}

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【讨论】：