英文:
GoLang - Iterate over data to unmarshal multiple YAML structures
问题
我对Golang还比较新手，请原谅我的新手问题。
我目前正在使用yaml.v2包（https://github.com/go-yaml/yaml）将YAML数据解组为结构体。
考虑以下示例代码：
package main
import (
"fmt"
"gopkg.in/yaml.v2"
"log"
)
type Container struct {
First string
Second struct {
Nested1 string
Nested2 string
Nested3 string
Nested4 int
}
}
var data = `
first: first value
second:
nested1: GET
nested2: /bin/bash
nested3: /usr/local/bin/customscript
nested4: 8080
first: second value
second:
nested1: POST
nested2: /bin/ksh
nested3: /usr/local/bin/customscript2
nested4: 8081
`
func main() {
container := Container{}
err := yaml.Unmarshal([]byte(data), &container)
if err != nil {
log.Fatalf("error: %v", err)
}
fmt.Printf("---values found:\n%+v\n\n", container)
}
结果为：
---values found: {First:second value Second:{Nested1:POST Nested2:/bin/ksh Nested3:/usr/local/bin/customscript2 Nested4:8081}}
这是预期的结果，unmarshal函数找到了一个YAML数据的实例。
我想做的是编写一个简单的while/each/for循环，循环遍历data变量，并将所有出现的数据解组为单独的Container结构体。我该如何实现这个目标？
英文:
I am fairly new to Golang, please excuse my newbyness.
I am currently using yaml.v2 package (https://github.com/go-yaml/yaml) to unmarshal YAML data into structs.
Consider the following example code:
package main
import (
"fmt"
"gopkg.in/yaml.v2"
"log"
)
type Container struct {
First string
Second struct {
Nested1 string
Nested2 string
Nested3 string
Nested4 int
}
}
var data = `
first: first value
second:
nested1: GET
nested2: /bin/bash
nested3: /usr/local/bin/customscript
nested4: 8080
first: second value
second:
nested1: POST
nested2: /bin/ksh
nested3: /usr/local/bin/customscript2
nested4: 8081
`
func main() {
container := Container{}
err := yaml.Unmarshal([]byte(data), &container)
if err != nil {
log.Fatalf("error: %v", err)
}
fmt.Printf("---values found:\n%+v\n\n", container)
}
The result:
---values found: {First:second value Second:{Nested1:POST Nested2:/bin/ksh Nested3:/usr/local/bin/customscript2 Nested4:8081}}
This is as expected, the unmarshal function finds one occurrence of the YAML data.
What I would like to do is write a simple while/each/for loop that loops through the data variable and marshals all the occurrences into seperate Container structs. How could I achieve this?
答案1
得分: 3
要实现你想要的简单更改，可以将yaml中的数据作为数组项，然后将其解组为Container的切片。
var data = `
- first: first value
second:
nested1: GET
nested2: /bin/bash
nested3: /usr/local/bin/customscript
nested4: 8080
- first: second value
second:
nested1: POST
nested2: /bin/ksh
nested3: /usr/local/bin/customscript2
nested4: 8081
`
func main() {
container := []Container{}
err := yaml.Unmarshal([]byte(data), &container)
if err != nil {
log.Fatalf("error: %v", err)
}
fmt.Printf("---values found:\n%+v\n\n", container)
}
输出结果为：
---values found:
[{First:first value Second:{Nested1:GET Nested2:/bin/bash Nested3:/usr/local/bin/customscript Nested4:8080}} {First:second value Second:{Nested1:POST Nested2:/bin/ksh Nested3:/usr/local/bin/customscript2 Nested4:8081}}]
英文:
A simple change to accomplish what you want is to have the data in the yaml be items in an array, then Unmarshal into a slice of Container
var data = `
- first: first value
second:
nested1: GET
nested2: /bin/bash
nested3: /usr/local/bin/customscript
nested4: 8080
- first: second value
second:
nested1: POST
nested2: /bin/ksh
nested3: /usr/local/bin/customscript2
nested4: 8081
`
func main() {
container := []Container{}
err := yaml.Unmarshal([]byte(data), &container)
if err != nil {
log.Fatalf("error: %v", err)
}
fmt.Printf("---values found:\n%+v\n\n", container)
}
---values found:
[{First:first value Second:{Nested1:GET Nested2:/bin/bash Nested3:/usr/local/bin/customscript Nested4:8080}} {First:second value Second:{Nested1:POST Nested2:/bin/ksh Nested3:/usr/local/bin/customscript2 Nested4:8081}}]
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