Export getId into function

mongox/common/saveone.go

@@ -13,27 +13,11 @@ func SaveOne(db *mongox.Database, source interface{}) error {
 
 	collection := db.GetCollectionOf(source)
 	opts := &options.FindOneAndReplaceOptions{}
+	id := base.GetID(source)
 
 	opts.SetUpsert(true)
 	opts.SetReturnDocument(options.After)
 
-	var id interface{}
-
-	switch doc := source.(type) {
-	case mongox.BaseObjectID:
-		id = doc.GetID()
-		if id == primitive.NilObjectID {
-			id = primitive.NewObjectID()
-		}
-	case mongox.BaseString:
-		id = doc.GetID()
-		if id == "" {
-			panic(errors.Malformedf("source contains malformed document, %v", source))
-		}
-	default:
-		panic(errors.Malformedf("source contains malformed document, %v", source))
-	}
-
 	result := collection.FindOneAndReplace(db.Context(), bson.M{"_id": id}, source, opts)
 	if result.Err() != nil {
 		return errors.NotFoundErrorf("%s", result.Err())