fix offset bug

document.go

@@ -52,7 +52,9 @@ func (document Document) Unmarshal(refType reflect.Type) (val reflect.Value, err
 
 func toDocument(v interface{}) Document {
 	var (
+		err         error
 		pos         int
+		buf         []byte
 		fieldName   string
 		refValue    reflect.Value
 		refType     reflect.Type
@@ -69,12 +71,21 @@ func toDocument(v interface{}) Document {
 		if fieldName == "-" {
 			continue
 		}
+		if !structField.IsExported() {
+			continue
+		}
 		if pos = strings.IndexByte(fieldName, ','); pos > -1 {
-			fieldName = fieldName[:i]
+			fieldName = fieldName[:pos]
 		}
 		if fieldName == "" {
 			fieldName = structField.Name
 		}
+		if marshaler, ok := fieldValue.Interface().(json.Marshaler); ok {
+			if buf, err = marshaler.MarshalJSON(); err == nil {
+				doc[fieldName] = strings.Trim(string(buf), "\"")
+				continue
+			}
+		}
 		switch fieldValue.Kind() {
 		case reflect.Struct:
 			doc[fieldName] = toDocument(fieldValue.Interface())

examples/insert.go

@@ -5,11 +5,13 @@ import (
 	"fmt"
 	"github.com/uole/jsondb"
 	"os"
+	"time"
 )
 
 type User struct {
-	ID   int    `json:"id"`
-	Name string `json:"name"`
+	ID        int       `json:"id"`
+	Name      string    `json:"name"`
+	CreatedAt time.Time `json:"createdAt"`
 }
 
 func (u *User) TableName() string {
@@ -29,8 +31,9 @@ func main() {
 		fmt.Println(err)
 	}
 	if err = db.Insert(context.Background(), &User{
-		ID:   1,
-		Name: "Hello",
+		ID:        1,
+		Name:      "Hello",
+		CreatedAt: time.Now(),
 	}); err != nil {
 		fmt.Println(err)
 	}