YAML forming via Golang - go

Question

Please help to fo create correct YAML structure.
I need to receive something like this :
groups:
- name: Group1
targets:
- host1
- host2
- name: Group2
targets:
- host1
- host2
And I have wrote the next code which is working but not correctly :
type YamlConfig struct {
Groups struct {
Name string `yaml:"name"`
Targets []string `yaml:"targets"`
} `yaml:"groups"`
}
var config YamlConfig
var hosts []string = []string{"host1", "host2"}
for host := range hosts {
config.Groups.Name = "Group"+strconv.Itoa(host)
config.Groups.Targets = hosts
}
y, err := yaml.Marshal(config)
if err != nil {
fmt.Printf("Marshal: %v", err)
}
fmt.Println(string(y))
But this example is forming only this struct :
groups:
name: Group1
targets:
- host1
- host2
Please help to get the first result on correct way

Answer 1

You need to change your structure a little bit. As Group is a list, you need an array in go struct. Then when populating the data, create a new group and append to config.
package main
import (
"fmt"
"strconv"
"gopkg.in/yaml.v2"
)
func main() {
type Group struct {
Name string `yaml:"name"`
Targets []string `yaml:"targets"`
}
type YamlConfig struct {
Groups []Group `yaml:"groups"`
}
var config YamlConfig
var hosts []string = []string{"host1", "host2"}
for host := range hosts {
var group Group
group.Name = "Group" + strconv.Itoa(host)
group.Targets = hosts
config.Groups = append(config.Groups, group)
}
y, err := yaml.Marshal(config)
if err != nil {
fmt.Printf("Marshal: %v", err)
}
fmt.Println(string(y))
}

Answer 2

You also need an array/slice of Group so that your field "Groups" can have type []group or []Group. Do that with its own struct.
Something like:
type group struct {
Name string `yaml:"name"`
Targets []string `yaml:"targets"`
}
type YamlConfig struct {
Groups []group `yaml:"groups"`
}