无法解组嵌套的 yaml答案

【问题标题】：Failed to unmarshal nested yaml无法解组嵌套的 yaml
【发布时间】：2020-02-14 08:21:31
【问题描述】：

Yaml 输入：

Tasks:
 - task: 
    name: 123
    retry: 5
    next: 123
 - task: 
    name: 123
    retry: 5
    next: 123

代码：

package main

import (
    "fmt"
    "io/ioutil"
    "os"

    "gopkg.in/yaml.v2"
)

type Tasks []struct {
    Task Task `yaml:"task"`
}

type Task struct {
    Name  string `yaml:"name"`
    Retry int    `yaml:"retry"`
    Next  string `yaml:"next"`
}

func main() {
    var w Tasks
    wfyaml, _ := os.Open(".yaml")
    byteValue, _ := ioutil.ReadAll(wfyaml)
    yaml.Unmarshal(byteValue, &w)
    fmt.Printf("%+v\n", w)
}

输出：[]

我无法弄清楚问题的原因。我已经检查过了。

【问题讨论】：

标签： go yaml

【解决方案1】：

您错过了结构 (playground) 中的顶层 (Tasks)：

package main

import (
    "fmt"

    "gopkg.in/yaml.v2"
)

const yamlStr = `Tasks:
 - task: 
    name: 123
    retry: 5
    next: 123
 - task: 
    name: 123
    retry: 5
    next: 123`

type File struct {
    Tasks Tasks `yaml:"Tasks"`
}

type Tasks []struct {
    Task Task `yaml:"task"`
}

type Task struct {
    Name  string `yaml:"name"`
    Retry int    `yaml:"retry"`
    Next  string `yaml:"next"`
}

func main() {
    var w File
    yaml.Unmarshal([]byte(yamlStr), &w)
    fmt.Printf("%+v\n", w)
}

【讨论】：