go - 如何使用 viper 将环境变量解码到 slice ？

Question

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.Fatalln("unable to decode into struct, %v", err)
    }

    log.Println(C)
    log.Println(len(C.Languages))
}

当未设置$MYPREFIX_LANGUAGES 时，C.Languages 的长度为2(例如默认值)。当我将 $MYPREFIX_LANGUAGES 设置为“english spanish french russian”时，我得到的长度为 1。它只是将变量作为 1 个长字符串，而不是一个 slice 。如何获取 slice ([]string{"english", "spanish", "french", "russian"}?

Answer 1

感谢@Charlino，这里是答案:

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("unable to decode into struct, %v", err)
    }

    log.Println(C)
    log.Println(len(C.Languages))
}