英文:
How do I unmarshal environment variables to a slice using viper?
问题
我有以下代码：
package main
import (
"log"
"github.com/spf13/viper"
)
func main() {
viper.SetEnvPrefix("myprefix")
viper.SetDefault("languages", []string{"french", "spanish"})
viper.BindEnv("name")
viper.BindEnv("languages")
type config struct {
Name string
Languages []string
}
var C config
err := viper.Unmarshal(&C)
if err != nil {
log.Fatalf("unable to decode into struct, %v", err)
}
log.Println(C)
log.Println(len(C.Languages))
}
当$MYPREFIX_LANGUAGES未设置时，C.Languages的长度为2（即默认值）。当我将$MYPREFIX_LANGUAGES设置为"english spanish french russian"时，长度为1。它只将变量作为一个长字符串，而不是一个切片。如何获取一个切片（[]string{"english", "spanish", "french", "russian"}）？
英文:
I have the following code:
package main
import (
"log"
"github.com/spf13/viper"
)
func main() {
viper.SetEnvPrefix("myprefix")
viper.SetDefault("languages", []string{"french", "spanish"})
viper.BindEnv("name")
viper.BindEnv("languages")
type config struct {
Name string
Languages []string
}
var C config
err := viper.Unmarshal(&C)
if err != nil {
log.Fatalln("unable to decode into struct, %v", err)
}
log.Println(C)
log.Println(len(C.Languages))
}
When $MYPREFIX_LANGUAGES is not set the length of C.Languages is 2 (eg the default). When I set $MYPREFIX_LANGUAGES to "english spanish french russian" I get a length of 1. It is just taking the variable as 1 long string, not a slice. How do I get a slice ([]string{"english", "spanish", "french", "russian"}?
答案1
得分: 7
感谢@Charlino，这是答案：
package main
import (
"log"
"github.com/spf13/viper"
)
func main() {
viper.SetEnvPrefix("myprefix")
viper.SetTypeByDefaultValue(true)
viper.SetDefault("languages", []string{"french", "spanish"})
viper.BindEnv("name")
viper.BindEnv("languages")
type config struct {
Name string
Languages []string
}
var C config
err := viper.Unmarshal(&C)
if err != nil {
log.Fatalln("无法解码为结构体，%v", err)
}
log.Println(C)
log.Println(len(C.Languages))
}
英文:
Thanks to @Charlino here is the answer:
package main
import (
"log"
"github.com/spf13/viper"
)
func main() {
viper.SetEnvPrefix("myprefix")
viper.SetTypeByDefaultValue(true)
viper.SetDefault("languages", []string{"french", "spanish"})
viper.BindEnv("name")
viper.BindEnv("languages")
type config struct {
Name string
Languages []string
}
var C config
err := viper.Unmarshal(&C)
if err != nil {
log.Fatalln("unable to decode into struct, %v", err)
}
log.Println(C)
log.Println(len(C.Languages))
}
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