go - 无法解码嵌套的Yaml

Question

Yaml输入:

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

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:[]

我不知道是什么原因造成的。我已经检查了我能做的。

Answer 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)
}