是否可以在Go中将结构作为参数传递？

Question

I'm trying to pass an array of key, values to another function in Go. Very new to Go so am struggling to figure it out.

package main

import(
    "net/http"
    "fmt"
    "io/ioutil"
    "net/url"
)

type Params struct {
    items []KeyValue
}

type KeyValue struct {
    key string
    value string
}

func main() {
     data := []Params{
          KeyValue{ key: "title", value: "Thingy" },
          KeyValue{ key: "body", value: "Testing 123" }}

     response, error := makePost("test-api.dev", &data)
}

func makePost(urlString string, values []Params) (string, error) {

     v := url.Values{}

    for _, val := range values {
        v.Add(val.key, val.value)
    }

    response, err := http.PostForm(urlString, v)

    defer response.Body.Close()

    contents, err :=  ioutil.ReadAll(response.Body)

    if err != nil {
        fmt.Printf("%s", err)
    }

    return string(contents), err
}

I get errors:

val.key undefined (type Params has no field or method key)
val.value undefined (type Params has no field or method key)

When I compile however.

Go playground link http://play.golang.org/p/CQw03wZmAV

Thanks in advance!

Answer 1

As others have mentioned, you have an []Params but you are trying to initialize with KeyValues.

data := []Params{
      KeyValue{ key: "title", value: "Thingy" },
      KeyValue{ key: "body", value: "Testing 123" }}

Instead, try:

data := &Params{items: []KeyValue{
    {key: "title", value: "Thingy"},
    {key: "body", value: "Testing 123"},
}}