英文:
go append to an interface key/field which is a map
问题
我的问题是关于向一个接口的字段/键中添加映射的问题。这是为了构建一个JSON对象所必需的。我正在使用map[string]interface{}来能够向其中添加任何结构类型。我不确定这是否是正确的方法，因为我还在学习Go，但我找不到更好的方法。以下是一个playground的链接：
https://play.golang.org/p/cxpSep8OQD。
我认为我需要使用类型追加，但我不明白如何做。任何帮助都将是有用的。
英文:
My question is about appending to a map which is a filed/key of an interface. This is required to build a JSON object. I am using map[string]interface{} to be able to append any struct types to it. I am not sure if that is a right way as I am still learning Go but I could not find a better way. Below is a link to a playground:
https://play.golang.org/p/cxpSep8OQD.
I think I need to use type accretion but I do not understand how. Any help would be useful.
答案1
得分: 0
如果你只有Group值，那么将outJson声明为*Group的映射：
outJson := make(map[string]*Group, len(groups))
如果映射可以包含不同的值类型，那么可以使用类型断言来访问该组：
g, ok := outJson["a"].(*Group)
if !ok {
panic("以更好的方式处理错误")
}
g.Hosts = append(g.Hosts, "hostname")
英文:
If all you have are Group values, then declare outJson as a map of *Group:
outJson := make(map[string]*Group, len(groups))
If the map can contain different value types, then use a type assertion to access the group:
g, ok := outJson["a"].(*Group)
if !ok {
panic("handle error a better way")
}
g.Hosts = append(g.Hosts, "hostname")
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