Golang YAML with nested properties to JSON - json

Question

I'm trying to parse some YAML from a file and convert each item to a flat JSON object.
I'm having some issues with datasets where there are multiple / nested objects.
I'm failing to unmarshal multiple items per file.
I'm unsure how to get nested properties such has item -> description -> en
When I run the following code I get the error.
cannot unmarshal !!map into []item.Item
I think I've got to look into sub-types within my structure, but I can't seem to get anything to work.
Any help would be appreciated.
Code:
import (
"gopkg.in/yaml.v2"
"io/ioutil"
)
func parseItemYaml() {
filePath := "./typeIDs.yaml"
yamlFile, err := ioutil.ReadFile(filePath)
if err != nil {
log.Printf("yamlFile.Get err #%v ", err)
}
itemData := map[int][]Item{}
err = yaml.Unmarshal(yamlFile, &itemData)
if err != nil {
panic(err)
}
// Then convert to JSON
// Eventual persistance
}
Item Structure:
type Item struct {
ID int
Name string `yaml:"name"`
Description string `yaml:"description"`
GroupID int `yaml:"groupID"`
IconID int `yaml:"iconID"`
GraphicID int `yaml:"graphicID"`
MarketGroupID int `yaml:"marketGroupID"`
Mass float64 `yaml:"mass"`
Published bool `yaml:"published"`
Volume float64 `yaml:"volume"`
}
Desired JSON format:
{
"ID":1563,
"Description":"Radiates an omnidirectional pulse from the ship that causes EM damage to surrounding vessels.",
"GroupID":72,
"IconID":112,
"GraphicID":72,
"MarketGroupID":382,
"Mass":10.0,
"Published":true,
"Volume":12.5
},
{...},
{...}
Data Subset:
1563:
description:
de: Ein ungerichteter Rundum-Impuls der vom Schiff ausgestrahlt wird und bei
umliegenden Schiffen EM-Schaden verursacht.
en: Radiates an omnidirectional pulse from the ship that causes EM damage
to surrounding vessels.
fr: Émet une impulsion omnidirectionelle qui part du vaisseau et provoque
des dégâts électromagnétiques à tous les vaisseaux situés à proximité.
ja: 全方位にパルスを放射し、周囲の艦にEMダメージを与える。
ru: Испускает сильный всенаправленный импульс, наносящий электромагнитный
ущерб всем объектам, окружающим корабль.
zh: 从舰船上发射一个全向脉冲，对周围船只造成电磁伤害。
graphicID: 2032
groupID: 72
iconID: 112
marketGroupID: 382
mass: 10.0
name:
de: Small EMP Smartbomb I
en: Small EMP Smartbomb I
fr: Petite bombe de proximité à IEM I
ja: 小型EMPスマートボムI
ru: Small EMP Smartbomb I
zh: 小型EMP立体炸弹 I
portionSize: 1
published: true
radius: 1000.0
volume: 12.5
1564:
basePrice: 650000.0
groupID: 152
iconID: 112
marketGroupID: 341
name:
de: Small EMP Smartbomb I Blueprint
en: Small EMP Smartbomb I Blueprint
fr: Plan de construction Petite bombe de proximité à IEM I
ja: 小型EMPスマートボムIブループリント
ru: Small EMP Smartbomb I Blueprint
zh: 小型EMP立体炸弹蓝图 I
portionSize: 1
published: true
volume: 0.01
1565:
description:
de: Ein ungerichteter Rundum-Impuls der vom Schiff ausgestrahlt wird und bei
umliegenden Schiffen EM-Schaden verursacht.
en: Radiates an omnidirectional pulse from the ship that causes EM damage
to surrounding vessels.
fr: Émet une impulsion omnidirectionelle qui part du vaisseau et provoque
des dégâts électromagnétiques à tous les vaisseaux situés à proximité.
ja: 全方位にパルスを放射し、周囲の艦にEMダメージを与える。
ru: Испускает сильный всенаправленный импульс, наносящий электромагнитный
ущерб всем объектам, окружающим корабль.
zh: 从舰船上发射一个全向脉冲，对周围船只造成电磁伤害。
graphicID: 2032
groupID: 72
iconID: 112
marketGroupID: 382
mass: 40.0
name:
de: Small EMP Smartbomb II
en: Small EMP Smartbomb II
fr: Petite bombe de proximité à IEM II
ja: 小型EMPスマートボムII
ru: Small EMP Smartbomb II
zh: 小型EMP立体炸弹 II
portionSize: 1
published: true
radius: 1000.0
volume: 5.0

Answer 1

Make structs e.g. like this:
type Language struct {
De string `yaml:de`
En string `yaml:en`
Fr string `yaml:fr`
Ja string `yaml:ja`
Ru string `yaml:ru`
Zh string `yaml:zh`
}
type Item struct {
Description Language `yaml:description`
GroupID int `yaml:"groupID"`
IconID int `yaml:"iconID"`
GraphicID int `yaml:"graphicID"`
MarketGroupID int `yaml:"marketGroupID"`
Mass float64 `yaml:"mass"`
Name Language `yaml:name`
Published bool `yaml:"published"`
Volume float64 `yaml:"volume"`
}
Also, as far as I see, it should be map[int]Item{} and not map[int][]Item{}.