UnmarshalKey / Sub only uses read config, neglects environment variables #1012
Description
Description:
A structured configuration is read using ReadConfig or ReadInConfig. Subsection keys are bound to environment variables. Viper correctly updates its config, i.e. key access Get / AllSettings works correctly. But when trying to use Unmarshal, only the config file seems to be used.
Code:
package main
import (
"bytes"
"fmt"
"os"
"github.com/spf13/viper"
)
func main() {
v := viper.New()
type Foo struct {
Bar string `mapstructure:"bar"`
}
foo := Foo{
Bar: "A",
}
var yamlExample = []byte(`
foo:
bar: "B"
`)
// Read config
fmt.Println("Reading config")
v.SetConfigType("yaml")
v.ReadConfig(bytes.NewBuffer(yamlExample))
fmt.Printf("%#v\n\n", v.AllSettings())
// BindEnv
fmt.Println("Setting env")
os.Setenv("FOO_BAR", "C")
v.BindEnv("foo.bar", "FOO_BAR")
fmt.Printf("%#v\n\n", v.AllSettings())
fmt.Println("Unmarshal")
if err := v.Sub("foo").Unmarshal(&foo); err != nil {
panic(err)
}
fmt.Printf("%#v\n\n", foo)
}Output:
Reading config
map[string]interface {}{"foo":map[string]interface {}{"bar":"B"}}
Setting env
map[string]interface {}{"foo":map[string]interface {}{"bar":"C"}}
Unmarshal
main.Foo{Bar:"B"}
Expected Output:
...
Unmarshal
main.Foo{Bar:"C"}