How to get JSON value based on other JSON values

问题

I have a struct in Go that came from and XML resp body:

{ 
    "pdp":{
        "sellableUnits":[
            {
                "attributes":[
                    {
                        "id":"22555278",
                        "type":"size",
                        "value":"03.5"
                    }
            ]
        }
    ]
}
}


type sizeJ struct {
    PDP struct {
        SellableUnits []struct {
            Attributes []struct {
                ID    string `json:"id"`
                Type  string `json:"type"`
                Val string `json:"value"`
            } `json:"attributes"`
        } `json:"units"`
    } `json:"pdp"`
}

There are different Vals and a different ID depending on the value of Val.

回答1:

Use a for loop, with range if you like.

func getValByID(j sizeJ, id string) string {
    for _, u := range j.PDP.SellableUnits {
        for _, a := range u.Attributes {
            if a.ID == id {
                return a.Val
            }
        }
    }
    return ""
}

func getIDByVal(j sizeJ, val string) string {
    for _, u := range j.PDP.SellableUnits {
        for _, a := range u.Attributes {
            if a.Val == val {
                return a.ID
            }
        }
    }
    return ""
}

https://play.golang.org/p/LjPrs1yGKGc

回答2:

you can use map instead of nested struct,such as

var myMap map[string]map[string]interface{}

or

var myMap map[string]interface{}

or every thing you want.

来源：https://stackoverflow.com/questions/65299372/how-to-get-json-value-based-on-other-json-values