add structure

lib/vo/pd.dart

@@ -0,0 +1,90 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
+
+class PD {
+  String id;
+  DateTime date;
+  String userID;
+  String userName;
+  String pdNumber;
+  List<PDLine> pdLines = [];
+
+  PD({this.id, this.date, this.userID, this.userName, this.pdNumber});
+
+  factory PD.fromMap(Map<String, dynamic> map, String id) {
+    var _dateTime = (map['date'] as Timestamp);
+
+    return PD(
+        id: id,
+        userID: map['user_id'],
+        userName: map['user_name'],
+        date: _dateTime?.toDate(),
+        pdNumber: map['pd_number']);
+  }
+
+  Map<String, dynamic> toMap() {
+    List lines = pdLines.map((l) => l.toMap()).toList();
+    return {
+      'id': id,
+      'date': date,
+      'pd_lines': lines,
+    };
+  }
+
+  @override
+  String toString() {
+    return 'PD{id:$id, date:$date,pdLines:$pdLines}';
+  }
+}
+
+class PDLine {
+  String storageID, storageName, productID, productName;
+  int quantity;
+  String action;
+  PDLine(
+      {this.storageID,
+      this.storageName,
+      this.productID,
+      this.productName,
+      this.quantity});
+
+  Map<String, dynamic> toMap() {
+    return {
+      'storage_id': storageID,
+      'storage_name': storageName,
+      'product_id': productID,
+      'product_name': productName,
+      'quantity': quantity
+    };
+  }
+
+  factory PDLine.fromMap(Map<String, dynamic> map) {
+    return PDLine(
+      storageID: map['storage_id'],
+      storageName: map['storage_name'],
+      productID: map['product_id'],
+      productName: map['product_name'],
+      quantity: map['quantity'],
+    );
+  }
+  @override
+  bool operator ==(other) {
+    if (identical(this, other)) {
+      return true;
+    }
+    return (other.storageID == this.storageID &&
+        other.productID == this.productID);
+  }
+
+  @override
+  int get hashCode {
+    int result = 17;
+    result = 37 * result + storageID.hashCode;
+    result = 37 * result + productID.hashCode;
+    return result;
+  }
+
+  @override
+  String toString() {
+    return 'PDLine{storageName:$storageName,productName:$productName,quantity:$quantity}';
+  }
+}