英文:
Is it possible to pass a struct as a parameter in Go?
问题
我正在尝试将一个键值对数组传递给Go中的另一个函数。由于我对Go还很陌生，所以我在弄清楚这个问题上遇到了困难。
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{
Params{items: []KeyValue{{key: "title", value: "Thingy"}, {key: "body", value: "Testing 123"}}},
}
response, err := makePost("test-api.dev", data)
}
func makePost(urlString string, values []Params) (string, error) {
v := url.Values{}
for _, val := range values {
for _, item := range val.items {
v.Add(item.key, item.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
}
我得到了以下错误：
val.key undefined (type Params has no field or method key)
val.value undefined (type Params has no field or method key)
但是当我编译时没有出错。
Go Playground链接：http://play.golang.org/p/CQw03wZmAV
提前感谢！
英文:
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!
答案1
得分: 2
values 是一个 []Params。当你对它进行迭代时，val 将是一个 Params，但你却将其当作一个 KeyValue 来处理。你是否真的打算传递一个 []Params，而不仅仅是一个 Params 或者只是一个 []KeyValue？
英文:
values is a []Params. When you iterate over it, val will be a Params, but you're treating it as though it was a KeyValue. Did you actually mean to pass an []Params at all, instead of just a Params or even just a []KeyValue?
答案2
得分: 1
如其他人所提到的，你有一个[]Params，但你试图用KeyValue进行初始化。
data := []Params{
KeyValue{ key: "title", value: "Thingy" },
KeyValue{ key: "body", value: "Testing 123" }
}
相反，尝试使用以下方式：
data := &Params{items: []KeyValue{
{key: "title", value: "Thingy"},
{key: "body", value: "Testing 123"},
}}
英文:
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"},
}}
答案3
得分: 0
感谢大家，最终通过以下方式使其工作：http://play.golang.org/p/aCKU5bTnhT
package main
import (
"fmt"
)
type Params struct {
items []KeyValue
}
type KeyValue struct {
key string
value string
}
func main() {
data := Params{items: []KeyValue{
{key: "title", value: "Thingy"},
{key: "body", value: "Testing 123"},
}}
makePost("test-api.dev", data)
}
func makePost(urlString string, values Params) string {
for _, val := range values.items {
fmt.Println("%s", val.key+":"+val.value)
}
return string("test")
}
英文:
Thanks folks, finally got it working with: http://play.golang.org/p/aCKU5bTnhT
package main
import (
"fmt"
)
type Params struct {
items []KeyValue
}
type KeyValue struct {
key string
value string
}
func main() {
data := Params{items: []KeyValue{
{key: "title", value: "Thingy"},
{key: "body", value: "Testing 123"},
}}
makePost("test-api.dev", data)
}
func makePost(urlString string, values Params) string {
for _, val := range values.items {
fmt.Println("%s", val.key+":"+val.value)
}
return string("test")
}
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