如何使用Viper从嵌套的YAML结构中获取值？

My question:

How do I write the code below to get a string from my nested yaml struct?

Here is my yaml:

    element:
      - one:
          url: http://test
          nested: 123
      - two:
          url: http://test
          nested: 123

    weather:
      - test:
          zipcode: 12345
      - ca:
          zipcode: 90210

Here is example code

    viper.SetConfigName("main_config")
      viper.AddConfigPath(".")
      err := viper.ReadInConfig()
      if err != nil {
        panic(err)
      }
    testvar := viper.GetString("element.one.url")

My problem:

I get a blank string when I print this. According to the docs, this is how you get a nested element. I suspect its not working because the elements are lists. Do I need to do a struct? I am new to go so not sure how to make one, especially if it needs to be nested.

There are different Get methods available in viper library and your YML structure is of type []map[string]string, so to parse your YML configuration file you have to use viper.Get method. So you have to parse your file something like this..

Note: You can use struct as well to un-marshal the data. Please refer this post mapping-nested-config-yaml-to-struct

package main

import (
    "fmt"

    "github.com/spf13/viper"
)

func main() {
    viper.SetConfigName("config")
    viper.AddConfigPath(".")
    err := viper.ReadInConfig()
    if err != nil {
        panic(err)
    }
    testvar := viper.Get("element")
    fmt.Println(testvar)
    elementsMap := testvar.([]interface{})
    for k, vmap := range elementsMap {
        fmt.Print("Key: ", k) 
        fmt.Println(" Value: ", vmap)
        eachElementsMap := vmap.(map[interface{}]interface{})

        for k, vEachValMap := range eachElementsMap {
            fmt.Printf("%v: %v 
", k, vEachValMap)
            vEachValDataMap := vEachValMap.(map[interface{}]interface{})

            for k, v := range vEachValDataMap {
                fmt.Printf("%v: %v 
", k, v)
            }
        }
    }
}

// Output:
/*
Key: 0 Value:  map[one:map[url:http://test nested:123]]
one: map[url:http://test nested:123]
url: http://test
nested: 123
Key: 1 Value:  map[two:map[url:http://test nested:123]]
two: map[url:http://test nested:123]
url: http://test
nested: 123
*/