英文:
Undefined map element in Golang
问题
由于某种原因，我得到了以下错误：
./execTest.go:24: template.datacenter undefined (type map[string]string has no field or method datacenter)
./execTest.go:25: template.datacenter undefined (type map[string]string has no field or method datacenter)
以下是我的Go代码：
package main
import (
"fmt"
)
var template map[string]string
func main() {
template := map[string]string{
"cluster": "",
"datacenter": "The_Datacenter",
"host": "",
"password": "",
"username": "",
"vm_name": "",
}
args := []string{
"--acceptAllEulas",
"--compress=9",
}
if template.datacenter != "" {
args = append(args, fmt.Sprintf("--datacenter=%s", template.datacenter))
}
fmt.Println(template)
}
英文:
For some reason I am getting the error below
./execTest.go:24: template.datacenter undefined (type map[string]string has no field or method datacenter)
./execTest.go:25: template.datacenter undefined (type map[string]string has no field or method datacenter)
Here is my Go code
package main
import (
"fmt"
)
var template map[string]string
func main() {
template := map[string]string{
"cluster": "",
"datacenter": "The_Datacenter",
"host": "",
"password": "",
"username": "",
"vm_name": "",
}
args := []string{
"--acceptAllEulas",
"--compress=9",
}
if template.datacenter != "" {
args = append(args, fmt.Sprintf("--datacenter=%s", template.datacenter))
}
fmt.Println(template)
}
答案1
得分: 2
template 是一个映射（map），而不是一个结构体（struct）。如果你想访问 datacenter 字符串，你需要写成 template["datacenter"]。
package main
import (
"fmt"
)
var template map[string]string
func main() {
template := map[string]string{
"cluster": "",
"datacenter": "The_Datacenter",
"host": "",
"password": "",
"username": "",
"vm_name": "",
}
args := []string{
"--acceptAllEulas",
"--compress=9",
}
if template["datacenter"] != "" {
args = append(args, fmt.Sprintf("--datacenter=%s", template["datacenter"]))
}
fmt.Println(template)
}
你可以在这里查看代码：http://play.golang.org/p/M0PHGx8R8g
英文:
template is a map, not a struct. If you want to access the datacenter string you need to write template["datacenter"].
http://play.golang.org/p/M0PHGx8R8g
package main
import (
"fmt"
)
var template map[string]string
func main() {
template := map[string]string{
"cluster": "",
"datacenter": "The_Datacenter",
"host": "",
"password": "",
"username": "",
"vm_name": "",
}
args := []string{
"--acceptAllEulas",
"--compress=9",
}
if template["datacenter"] != "" {
args = append(args, fmt.Sprintf("--datacenter=%s", template["datacenter"]))
}
fmt.Println(template)
}
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