add paginator in boxes and deliveries

lib/domain/constants.dart

@@ -11,6 +11,7 @@ const cargo_types_collection = "cargo_types";
 const custom_duties_collection = "custom_duties";
 const discounts_by_weights_collection = "discounts_by_weight";
 const shipments_collection = "shipments";
+const boxes_collection = "boxes";
 
 // docs
 const setting_doc_id = "setting";

lib/domain/entities/box.dart

@@ -1,3 +1,4 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:fcs/domain/entities/discount_by_weight.dart';
 import 'package:fcs/domain/entities/rate.dart';
 import 'package:fcs/domain/vo/shipment_status.dart';
@@ -109,8 +110,8 @@ class Box {
       this.cartonType,
       this.fcsID,
       this.userName,
-      this.rate,
-      this.weight,
+      this.rate = 0,
+      this.weight = 0,
       this.packageType,
       this.pickUpID,
       this.remark,
@@ -133,4 +134,21 @@ class Box {
       'delivery_address': deliveryAddress.toMap(),
     };
   }
+
+  factory Box.fromMap(Map<String, dynamic> map, String docID) {
+    var _arrivedDate = (map['arrived_date'] as Timestamp);
+
+    return Box(
+        id: docID,
+        arrivedDate: _arrivedDate != null ? _arrivedDate.toDate() : null,
+        shipmentNumber: map['shipment_number'],
+        receiverNumber: map['receiver_number'],
+        boxNumber: map['box_number'],
+        length: map['length'],
+        width: map['width'],
+        height: map['height'],
+        userName: map['user_name'],
+        fcsID: map['fcs_id'],
+        cartonType: map['carton_type']);
+  }
 }