backup. before shop update

lib/models/product_attribute.dart

@@ -0,0 +1,41 @@
+
+import 'dart:convert';
+
+import 'product_option.dart';
+
+class ProductAttribute {
+  int id;
+  String name;
+  List<ProductOption> productOptions;
+  bool singleSelection;
+  bool byQuantity;
+  bool required;
+  String extra;
+  bool disabled;
+
+  ProductAttribute.fromJson(Map<String, dynamic> json)
+    : id = json['id'],
+      name = json['name'],
+      productOptions = (json['productoptions'] as List).map((i) => ProductOption.fromJson(i)).toList(),
+      singleSelection = json['single_selection'],
+      byQuantity = json['by_quantity'],
+      required = json['required'],
+      extra = json['extra'],
+      disabled = json['disabled'];
+
+  Map<String, dynamic> toJson() => {
+    'id': id,
+    'name': name,
+    'productoptions': productOptions,
+    'single_selection': singleSelection,
+    'by_quantity': byQuantity,
+    'required': required,
+    'extra': extra,
+    'disabled': disabled
+  };
+
+  @override
+  String toString() {
+    return json.encode(this);
+  }
+}