当并非所有Struct值都可以转换为接口时，请重命名JSON标签{}

Question

Say I have the following struct and I want to rename X and Y according to some string variables in my code.

type RenameStruct struct {
    X map[string]interface{}
    Y []map[string]interface{}
}

What is the best approach to have them Renamed when Encoding to JSON ? The ones I found here in StackOverflow seems to not be applicable to a struct where one field is an interface{} ant the other an []interface{}.

Edit: I used Dave's answer to create a list of the "RenameStruct" this way: play.golang.org/p/hKZQvhJV2iL

Answer 1

You would need to use a custom JSON marshaller, and then have some way of passing in the names you want. The only easy way I can think of would be to do:

type RenameStruct struct {
    X map[string]interface{}
    Y []map[string]interface{}
    xName string
    yName string
}

func (r RenameStruct) MarshalJSON() ([]byte, error) {
    data := make(map[string]interface{})
    data[r.xName] = r.X
    data[r.yName] = r.Y
    return json.Marshal(data)
}

https://play.golang.org/p/cpjgJ5tpcK3