🐛 fix: bind struct - if c.data is nil, directly return. see #162

export.go

@@ -78,8 +78,12 @@ func (c *Config) MapOnExists(key string, dst any) error {
 //	config.Structure("db", &dbInfo)
 func (c *Config) Structure(key string, dst any) error {
 	var data any
-	// binding all data
+	// binding all data on key is empty.
 	if key == "" {
+		// fix: if c.data is nil, directly return
+		if len(c.data) == 0 {
+			return nil
+		}
 		data = c.data
 	} else {
 		// binding sub-data of the config

issues_test.go

@@ -1,10 +1,10 @@
 package config_test
 
 import (
+	"fmt"
 	"os"
 	"testing"
 	"time"
-        "fmt"
 
 	"github.com/gookit/config/v2"
 	"github.com/gookit/config/v2/ini"
@@ -461,3 +461,27 @@ func TestDuration(t *testing.T) {
 		is.Equal(float64(seconds), dur.Duration.Seconds())
 	}
 }
+
+// https://github.com/gookit/config/issues/162
+func TestIssues_162(t *testing.T) {
+	type Logger struct {
+		Name     string `json:"name"`
+		LogFile  string `json:"logFile"`
+		MaxSize  int    `json:"maxSize" default:"1024"` // MB
+		MaxDays  int    `json:"maxDays" default:"7"`
+		Compress bool   `json:"compress" default:"true"`
+	}
+
+	type LogConfig struct {
+		Loggers []*Logger `default:""` // mark for parse default
+	}
+
+	c := config.New("issues_162", config.ParseDefault)
+	err := c.LoadStrings(config.JSON, `{}`)
+	assert.NoErr(t, err)
+
+	opt := &LogConfig{}
+	err = c.Decode(opt)
+	// dump.Println(opt)
+	assert.Empty(t, opt.Loggers)
+}