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lib/Screens/Due Calculation/Model/due_collection_invoice_model.dart

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+class DueCollectionInvoice {
+  DueCollectionInvoice({
+    this.id,
+    this.due,
+    this.name,
+    this.type,
+    this.salesDues,
+  });
+
+  DueCollectionInvoice.fromJson(dynamic json) {
+    id = json['id'];
+    due = json['due'];
+    name = json['name'];
+    type = json['type'];
+    if (json[json['type'] == 'Supplier' ? 'purchases_dues' : 'sales_dues'] != null) {
+      salesDues = [];
+      json[json['type'] == 'Supplier' ? 'purchases_dues' : 'sales_dues'].forEach((v) {
+        salesDues?.add(SalesDuesInvoice.fromJson(v));
+      });
+    }
+  }
+
+  num? id;
+  num? due;
+  String? name;
+  String? type;
+  List<SalesDuesInvoice>? salesDues;
+
+  Map<String, dynamic> toJson() {
+    final map = <String, dynamic>{};
+    map['id'] = id;
+    map['due'] = due;
+    map['name'] = name;
+    map['type'] = type;
+    if (salesDues != null) {
+      map['sales_dues'] = salesDues?.map((v) => v.toJson()).toList();
+    }
+    return map;
+  }
+}
+
+class SalesDuesInvoice {
+  SalesDuesInvoice({
+    this.id,
+    this.partyId,
+    this.dueAmount,
+    this.paidAmount,
+    this.totalAmount,
+    this.invoiceNumber,
+  });
+
+  SalesDuesInvoice.fromJson(dynamic json) {
+    id = json['id'];
+    partyId = json['party_id'];
+    dueAmount = json['dueAmount'];
+    paidAmount = json['paidAmount'];
+    totalAmount = json['totalAmount'];
+    invoiceNumber = json['invoiceNumber'];
+  }
+
+  num? id;
+  num? partyId;
+  num? dueAmount;
+  num? paidAmount;
+  num? totalAmount;
+  String? invoiceNumber;
+
+  Map<String, dynamic> toJson() {
+    final map = <String, dynamic>{};
+    map['id'] = id;
+    map['party_id'] = partyId;
+    map['dueAmount'] = dueAmount;
+    map['paidAmount'] = paidAmount;
+    map['totalAmount'] = totalAmount;
+    map['invoiceNumber'] = invoiceNumber;
+    return map;
+  }
+}

lib/Screens/Due Calculation/Model/due_collection_model.dart

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+import '../../../model/sale_transaction_model.dart';
+import '../../../widgets/multipal payment mathods/model/payment_transaction_model.dart';
+import '../../Customers/Model/parties_model.dart';
+
+class DueCollection {
+  DueCollection(
+      {this.id,
+      this.businessId,
+      this.partyId,
+      this.userId,
+      this.saleId,
+      this.purchaseId,
+      this.totalDue,
+      this.dueAmountAfterPay,
+      this.payDueAmount,
+      this.paymentTypeId,
+      this.paymentType,
+      this.paymentDate,
+      this.invoiceNumber,
+      this.createdAt,
+      this.updatedAt,
+      this.user,
+      this.party,
+      this.transactions,
+      this.branch});
+
+  DueCollection.fromJson(dynamic json) {
+    id = json['id'];
+    businessId = json['business_id'];
+    partyId = json['party_id'];
+    userId = json['user_id'];
+    saleId = json['sale_id'];
+    purchaseId = json['purchase_id'];
+    totalDue = json['totalDue'];
+    dueAmountAfterPay = json['dueAmountAfterPay'];
+    payDueAmount = json['payDueAmount'];
+    paymentTypeId = int.tryParse(json["payment_type_id"].toString());
+    // paymentType = json['paymentType'];
+    paymentDate = json['paymentDate'];
+    invoiceNumber = json['invoiceNumber'];
+    createdAt = json['created_at'];
+    updatedAt = json['updated_at'];
+    user = json['user'] != null ? User.fromJson(json['user']) : null;
+    party = json['party'] != null ? Party.fromJson(json['party']) : null;
+    paymentType = json['payment_type'] != null ? PaymentType.fromJson(json['payment_type']) : null;
+    branch = json['branch'] != null ? Branch.fromJson(json['branch']) : null;
+    // NEW: Parsing the transactions list
+    if (json['transactions'] != null) {
+      transactions = [];
+      json['transactions'].forEach((v) {
+        transactions?.add(PaymentsTransaction.fromJson(v));
+      });
+    }
+  }
+
+  num? id;
+  num? businessId;
+  num? partyId;
+  num? userId;
+  num? saleId;
+  num? purchaseId;
+  num? totalDue;
+  num? dueAmountAfterPay;
+  num? payDueAmount;
+  int? paymentTypeId;
+  PaymentType? paymentType;
+  String? invoiceNumber;
+  String? paymentDate;
+  String? createdAt;
+  String? updatedAt;
+  User? user;
+  Party? party;
+  Branch? branch;
+  List<PaymentsTransaction>? transactions; // NEW Variable
+
+  Map<String, dynamic> toJson() {
+    final map = <String, dynamic>{};
+    map['id'] = id;
+    map['business_id'] = businessId;
+    map['party_id'] = partyId;
+    map['user_id'] = userId;
+    map['sale_id'] = saleId;
+    map['purchase_id'] = purchaseId;
+    map['totalDue'] = totalDue;
+    map['dueAmountAfterPay'] = dueAmountAfterPay;
+    map['payDueAmount'] = payDueAmount;
+    map['paymentType'] = paymentType;
+    map['paymentDate'] = paymentDate;
+    map['created_at'] = createdAt;
+    map['updated_at'] = updatedAt;
+    if (user != null) {
+      map['user'] = user?.toJson();
+    }
+    if (party != null) {
+      map['party'] = party?.toJson();
+    }
+    map['branch'] = branch;
+    return map;
+  }
+}
+
+class PaymentType {
+  int? id;
+  String? name;
+
+  PaymentType({required this.id, required this.name});
+
+  // Factory constructor to create an instance from a Map
+  factory PaymentType.fromJson(Map<String, dynamic> json) {
+    return PaymentType(
+      id: json['id'] as int,
+      name: json['name'] as String,
+    );
+  }
+
+  // Method to convert an instance to a Map
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'name': name,
+    };
+  }
+}
+
+class Branch {
+  Branch({
+    this.id,
+    this.name,
+    this.phone,
+    this.address,
+  });
+
+  Branch.fromJson(dynamic json) {
+    id = json['id'];
+    name = json['name'];
+    phone = json['phone'];
+    address = json['address'];
+  }
+
+  num? id;
+  String? name;
+  String? phone;
+  String? address;
+}