英文:
Initialize an array of structs inside a nested struct in golang
问题
我想知道如何在嵌套结构中定义、初始化一个结构数组，例如：
type State struct {id string `json:"id" bson:"id"`Cities Cities}type City struct {id string `json:"id" bson:"id"`}type Cities struct {cities []City}
现在，我该如何初始化这样的结构？如果有人对如何创建这个结构有不同的想法，请告诉我。
谢谢！
英文:
I am wondering how can I define and initialize and array of structs inside a nested struct, for example:
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.
Thanks
答案1
得分: 34
在你的情况下，简写的字面量语法如下：
state := State {id: "CA",Cities: Cities{[]City {{"SF"},},},}
如果你不想使用键值对语法来表示字面量，可以更简短一些：
state := State {"CA", Cities{[]City {{"SF"},},},}
顺便提一下，如果Cities除了[]City之外没有其他内容，可以直接使用City的切片。这将导致语法更短，并且去除了一个不必要的（可能的）层级：
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)}
英文:
In your case the shorthand literal syntax would be:
state := State {id: "CA",Cities: Cities{[]City {{"SF"},},},}
Or shorter if you don't want the key:value syntax for literals:
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:
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)}
答案2
得分: 6
完整的示例，将所有内容都明确写出来：
state := State{id: "独立的Stackoverflow共和国",Cities: Cities{cities: []City{City{id: "Postington O.P.",},},},}
英文:
Full example with everything written out explicitly:
state := State{id: "Independent Republic of Stackoverflow",Cities: Cities{cities: []City{City{id: "Postington O.P.",},},},}
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