json 在 golang 中的嵌套结构中初始化结构数组
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Initialize an array of structs inside a nested struct in golang
提问by mquemazz
I am wondering how can I define and initialize and array of structs inside a nested struct, for example:
我想知道如何在嵌套结构中定义和初始化结构数组，例如：
type State struct {
id string `json:"id" bson:"id"`
Cities
}
type City struct {
id string `json:"id" bson:"id"`
}
type Cities struct {
cities []City
}
Now how can I Initialize such a structure and if someone has a different idea about how to create the structure itself.
现在我如何初始化这样的结构，如果有人对如何创建结构本身有不同的想法。
Thanks
谢谢
回答by Not_a_Golfer
In your case the shorthand literal syntax would be:
在您的情况下，速记文字语法将是：
state := State {
id: "CA",
Cities: Cities{
[]City {
{"SF"},
},
},
}
Or shorter if you don't want the key:value syntax for literals:
或者更短，如果您不想要文字的 key:value 语法：
state := State {
"CA", Cities{
[]City {
{"SF"},
},
},
}
BTW if Cities doesn't contain anything other than the []City, just use a slice of City. This will lead to a somewhat shorter syntax, and remove an unnecessary (possibly) layer:
顺便说一句，如果 Cities 不包含 []City 以外的任何内容，则只需使用 City 的一部分。这将导致语法更短，并删除不必要的（可能）层：
type State struct {
id string `json:"id" bson:"id"`
Cities []City
}
type City struct {
id string `json:"id" bson:"id"`
}
func main(){
state := State {
id: "CA",
Cities: []City{
{"SF"},
},
}
fmt.Println(state)
}
回答by thwd
Full example with everything written out explicitly:
明确写出所有内容的完整示例：
state := State{
id: "Independent Republic of Stackoverflow",
Cities: Cities{
cities: []City{
City{
id: "Postington O.P.",
},
},
},
}
