backup. before shop update

lib/models/waiting_line.dart

@@ -0,0 +1,23 @@
+
+import 'dart:convert';
+
+import 'waiting_line_item.dart';
+
+class WaitingLine {
+  List<WaitingLineItem> waitingLines;
+  String storeSn;
+
+  WaitingLine.fromJson(Map<String, dynamic> json)
+    : waitingLines = (json['waiting_lines'] as List).map((i) => WaitingLineItem.fromJson(i)).toList(),
+      storeSn = json['store_sn'];
+
+  Map<String, dynamic> toJson() => {
+    'waiting_lines': waitingLines,
+    'store_sn': storeSn
+  };
+
+  @override
+  String toString() {
+    return json.encode(this);
+  }
+}