使用Golang读取包含嵌套映射的YAML文件。

huangapple
go评论154阅读模式
英文:

Golang YAML reading with map of maps

问题

这是我的YAML文件。

  1. description: 水果很美味
  2. fruits:
  3.   apple:
  4.     - 红色
  5.     - 甜的
  6.   lemon:
  7.     - 黄色
  8.     - 酸的

我可以使用gopkg.in/yaml.v1包读取这个文件的扁平版本，但是我在尝试读取这个似乎有嵌套映射的YAML文件时遇到了困难。

  1. package main
  3. import (
  4.   "fmt"
  5.   "gopkg.in/yaml.v1"
  6.   "io/ioutil"
  7.   "path/filepath"
  8. )
  10. type Config struct {
  11.   Description string
  12.   Fruits []Fruit
  13. }
  15. type Fruit struct {
  16.   Name string
  17.   Properties []string
  18. }
  20. func main() {
  21.   filename, _ := filepath.Abs("./file.yml")
  22.   yamlFile, err := ioutil.ReadFile(filename)
  24.   if err != nil {
  25.     panic(err)
  26.   }
  28.   var config Config
  30.   err = yaml.Unmarshal(yamlFile, &config)
  31.   if err != nil {
  32.     panic(err)
  33.   }
  35.   fmt.Printf("Value: %#v\n", config.Description)
  36.   fmt.Printf("Value: %#v\n", config.Fruits)
  37. }

它无法获取嵌套的水果。似乎返回的是空的。Value: []main.Fruit(nil)。

英文:

Here is my YAML file.

  1. description: fruits are delicious
  2. fruits:
  3.   apple:
  4.     - red
  5.     - sweet
  6.   lemon:
  7.     - yellow
  8.     - sour

I can read a flatter version of this with the gopkg.in/yaml.v1 package but I'm stuck trying to figure out how to read this YAML file when it's got what seems like a map of maps.

  1. package main
  3. import (
  4.   "fmt"
  5.   "gopkg.in/yaml.v1"
  6.   "io/ioutil"
  7.   "path/filepath"
  8. )
  10. type Config struct {
  11.   Description string
  12.   Fruits []Fruit
  13. }
  15. type Fruit struct {
  16.   Name string
  17.   Properties []string
  18. }
  20. func main() {
  21.   filename, _ := filepath.Abs("./file.yml")
  22.   yamlFile, err := ioutil.ReadFile(filename)
  24.   if err != nil {
  25.     panic(err)
  26.   }
  28.   var config Config
  30.   err = yaml.Unmarshal(yamlFile, &config)
  31.   if err != nil {
  32.     panic(err)
  33.   }
  35.   fmt.Printf("Value: %#v\n", config.Description)
  36.   fmt.Printf("Value: %#v\n", config.Fruits)
  37. }

It can't get the nested Fruits out. It seems to come back empty. Value: []main.Fruit(nil).

答案1

得分: 20

使用字符串切片的映射来表示水果属性：

  1. type Config struct {
  2.   Description string
  3.   Fruits map[string][]string
  4. }

使用以下代码打印解析后的配置：

  1. fmt.Printf("%#v\n", config)

产生以下输出（不包括我为了可读性而添加的空格）：

  1. main.Config{Description:"水果很美味",
  2.      Fruits:map[string][]string{
  3.           "lemon":[]string{"黄色", "酸味"},
  4.           "apple":[]string{"红色", "甜味"}}}
英文:

Use a map of string slices to represent the fruit properties:

  1. type Config struct {
  2.   Description string
  3.   Fruits map[string][]string
  4. }

Printing the unmarshaled configuration with

  1. fmt.Printf("%#v\n", config)

produces the following output (not including the whitespace I added for readability):

  1. main.Config{Description:"fruits are delicious", 
  2.      Fruits:map[string][]string{
  3.           "lemon":[]string{"yellow", "sour"}, 
  4.           "apple":[]string{"red", "sweet"}}}

huangapple
  • 本文由 发表于 2014年10月10日 09:20:20
  • 转载请务必保留本文链接：https://go.coder-hub.com/26290485.html
  • go
  • yaml
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