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.",
},
},
},
}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论