using map[string]interface{} :

Question

Given the following code:

type Message struct {
    Params map[string]interface{} `json:"parameters"`
    Result interface{}            `json:"result"`
}

func (h Handler) Product(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {

    msg := &Message{
        Action: "get_products",
        Params: {
            "id1": val1,
            "id2": val2,
        },
    }
     h.route(msg)

}

The idea is to be able to send a block of an unknown amount id1 => val1, id2 =>val2 ... to h.route.

it gives me this error:

missing type in composite literal

is it a typo that your Action should be Result? or it's a field you forgot to define in the struct? — nevets
– nevets, Commented Apr 14, 2016 at 15:21

william.taylor.09 · Accepted Answer · 2016-04-14 15:15:35Z

15

You should initialize it like this:

func (h Handler) Product(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
    msg := &Message{
        Action: "get_products",
        Params: map[string]interface{}{
            "id1": val1,
            "id2": val2,
        },
    }
    h.route(msg)
}

Stripped down to compile: http://play.golang.org/p/bXVOwIhLlg

answered Apr 14, 2016 at 15:15

william.taylor.09

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