[]*Struct 类型的变量应该使用哪种方式初始化？

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This topic created in 1571 days ago, the information mentioned may be changed or developed.

特意去掉了 omitempty tag

为了防止出现

{
    "apps": null
}

最推荐的声明方式应该是哪一种？

package main

type App struct {
	Id   int    `json:"id"`
	Name string `json:"name"`
}

type Apps []*App

type Domain struct {
	Apps Apps
}

const CustomCapacity = 3

func main() {
	apps1 := make([]*App, 0, CustomCapacity)
	apps2 := make([]App, 0, CustomCapacity)
	apps3 := make(Apps, 0, CustomCapacity)
	apps4 := Apps{}
	apps5 := &Apps{}
}

4 replies

MidGap

Jan 17, 2022

type Domain struct {
Apps Apps `json:"apps,omitempty"`
}

777777

Jan 17, 2022

var domain Domain
app := APP{Id:0, Name:""}
domain.Apps := []*APP{&app} // 如果要 3 个 []*APP{&app, &app, &app}

我猜你的需求是因为前端说：空数据也要返回字段。

eudore

Jan 18, 2022

Projects: []*ConfigK8SProject{
{Project: "dev/*", AutoUpdate: true, Cluster: "local2180", Namespace: "dev"},
{Project: "test/esb-*", AutoUpdate: true, Cluster: "local2180", Namespace: "test"},
}

hzzhzzdogee

Jan 21, 2022

前三种都不会出现 { "apps": null}