add structure

lib/vo/reg.dart

@@ -0,0 +1,49 @@
+
+import 'product.dart';
+
+class Reg {
+  String name = "", address = "", type = "";
+  int numberOfShops = 0;
+
+  final String sellerID;
+  final String buyerID;
+  final List<Product> products;
+
+  Map<String, dynamic> toMap() {
+    var _products = [];
+    products.forEach((p) => _products.add(p.toMap()));
+    return {
+      'products': _products,
+      'seller_id': sellerID,
+      'buyer_id': buyerID,
+    };
+  }
+
+  Reg(this.sellerID, this.buyerID, this.products);
+
+  void addProduct(Product product) {
+    var _product = _get(product.id);
+    if (_product == null) {
+      _product = product;
+      products.add(product);
+    }
+    _product.dailySale = product.dailySale;
+    _product.storageCapacity = product.storageCapacity;
+  }
+
+  void deleteProduct(Product product) {
+    var _product = _get(product.id);
+    if (_product == null) {
+      return;
+    }
+    products.remove(_product);
+  }
+
+  Product _get(String id) {
+    try {
+      return products.firstWhere((p) => p.id == id);
+    } catch (e) {
+      return null;
+    }
+  }
+}