英文:
JSON and struct composition in Go
问题
我有一个类似于Network -> Serie -> Season -> Episodes的层次结构。这只是我真实层次结构的简化版本，实际上有7个层级。
我需要使用以下JSON对这些对象进行解码/编码：
Network:
{
id: 1,
name: 'Fox'
}
Series:
{
id: 2,
name: 'The Simpsons',
network: {
id: 1,
name: 'Fox'
}
}
Season:
{
id: 3,
name: 'Season 3',
network: {
id: 1,
name: 'Fox'
},
series: {
id: 2,
name: 'The Simpsons'
}
}
Episode:
{
id: 4,
name: 'Pilot',
network: {
id: 1,
name: 'Fox'
},
series: {
id: 2,
name: 'The Simpsons'
},
season: {
id: 3,
name: 'Season 3'
}
}
我尝试像这样组合我的对象：
type Base struct {
ID string json:"id"
Name string json:"name"
}
type Network struct {
Base
}
type Series struct {
Network // 展开所有Network属性（ID + Name）
Network Base json:"network"
}
type Season struct {
Series // 展开所有Series属性（ID + Name + Network）
Series Base json:"series"
}
type Episode struct {
Season // 展开所有Season属性（ID + Name + Network + Series）
Season Season json:"season"
}
当然，由于“重复字段错误”，这样做是行不通的。此外，JSON结果将会嵌套得很深。
在经典面向对象编程中，使用普通的继承是相当容易的，在原型语言中也是可行的（Object.create/Mixins）。
在Go语言中是否有一种优雅的方法来实现这个？我希望保持代码的DRY（不重复）。
英文:
I have hierarchical structure similar to this Network -> Serie -> Season -> Episodes. This is a simplified version my real hierarchy is 7 levels deep.
I need to decode/encode these objects with the following JSON:
Network:
{
id: 1,
name: 'Fox'
}
Series:
{
id: 2,
name: 'The Simpsons',
network: {
id: 1,
name: 'Fox'
}
}
Season:
{
id: 3,
name: 'Season 3',
network: {
id: 1,
name: 'Fox'
},
series: {
id: 2,
name: 'The Simpsons'
}
}
Episode:
{
id: 4,
name: 'Pilot',
network: {
id: 1,
name: 'Fox'
},
series: {
id: 2,
name: 'The Simpsons'
},
season: {
id: 3,
name: 'Season 3'
}
}
I tried composing my objects like these:
type Base struct {
ID string `json:"id"`
Name string `json:"name"`
}
type Network struct {
Base
}
type Series struct {
Network // Flatten out all Network properties (ID + Name)
Network Base `json:"network"`
}
type Season struct {
Series // Flatten out all Series properties (ID + Name + Network)
Series Base `json:"series"`
}
type Episode struct {
Season // Flatten out all Season properties (ID + Name + Network + Series)
Season Season `json:"season"`
}
Of course it doesn't work due "duplicate field error". In addition the JSON result would be deeply nested.
In classic OOP this is fairly easy using normal inheritance, in prototype languages it's also doable (Object.create/Mixins)
Is there an elegant way of do this with golang? I would prefer to keep code DRY.
答案1
得分: 3
为什么不重命名属性？但保留JSON标签，并根据该标签进行编组/解组。
type Base struct {
ID string `json:"id"`
Name string `json:"name"`
}
type Network struct {
Base
}
type Series struct {
Network // 展开所有Network属性（ID + Name）
NetworkBase Base `json:"network"`
}
type Season struct {
Series // 展开所有Series属性（ID + Name + Network）
SeriesBase Base `json:"series"`
}
type Episode struct {
Season // 展开所有Season属性（ID + Name + Network + Series）
SeasonBase Base `json:"season"`
}
英文:
Why not rename the propriety? But keep the json tags, and go will marshal/unmarshal based on that tag
type Base struct {
ID string `json:"id"`
Name string `json:"name"`
}
type Network struct {
Base
}
type Series struct {
Network // Flatten out all Network properties (ID + Name)
NetworkBase Base `json:"network"`
}
type Season struct {
Series // Flatten out all Series properties (ID + Name + Network)
SeriesBase Base `json:"series"`
}
type Episode struct {
Season // Flatten out all Season properties (ID + Name + Network + Series)
SeasonBase Base `json:"season"`
}
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