defaults for nested keys don't work with AllSettings or Unmarshal

[jbeda]

package main

import (
    "bytes"
    "fmt"
    "github.com/kr/pretty"
    "github.com/spf13/viper"
)

type Config struct {
    Explicit int
    Nested   struct {
        Explicit int
        Default  int
    }
}

func main() {
    var input = []byte(`
  explicit: 1
  nested:
    explicit: 2
`)
    viper.SetDefault("nested.default", 3)
    viper.SetConfigType("yaml")
    viper.ReadConfig(bytes.NewBuffer(input))

    fmt.Println("viper.AllSettings:")
    pretty.Println(viper.AllSettings())

    var c Config
    viper.Unmarshal(&c)
    fmt.Println("\nviper.Unmarshal:")
    pretty.Println(c)
}

Produces:

viper.AllSettings:
map[string]interface {}{
    "explicit": int(1),
    "nested":   map[interface {}]interface {}{
        "explicit": int(2),
    },
    "nested.default": nil,
}

viper.Unmarshal:
main.Config{
    Explicit: 1,
    Nested:   struct { Explicit int; Default int }{Explicit:2, Default:0},
}

I would expect the defaults would be applied in both of these cases.

[awfm9]

Fixed by #195