fix: adding user info in loan item (admin access)

lib/src/models/loan.dart

 import 'package:library_app/src/models/book.dart';
+import 'package:library_app/src/models/user.dart';
 
 class Loan {
   Book book;
+  User? user;
   String loanDate;
   String dueDate;
   String remainingDays;
@@ -9,6 +11,7 @@ class Loan {
 
   Loan(
     this.book,
+    this.user,
     this.loanDate,
     this.dueDate,
     this.remainingDays,
@@ -19,6 +22,7 @@ class Loan {
     final book = Book.fromJson(data["book_detail"]);
     return Loan(
       book,
+      null,
       data["loan_date"],
       data["due_date"],
       data["remaining_loan_time"],

lib/src/widgets/loans/admin_loan_list.dart

 import 'package:flutter/material.dart';
 import 'package:library_app/src/models/book.dart';
+import 'package:library_app/src/models/user.dart';
 import 'package:library_app/src/providers/auth_provider.dart';
 import 'package:provider/provider.dart';
 
@@ -45,8 +46,21 @@ class _AdminLoanList extends State<AdminLoanList> {
         var loans = getLoans.map(
           (loan) {
             var book = Book.fromJson(loan["book_detail"]);
+            var memberData = loan["member_detail"];
+            var userData = memberData["user"];
+            var user = User(
+              userData["id"],
+              memberData["id"],
+              userData["username"],
+              userData["email"],
+              userData["first_name"],
+              userData["last_name"],
+              userData["is_staff"],
+            );
+
             return Loan(
               book,
+              user,
               loan["loan_date"],
               loan["due_date"],
               loan["remaining_loan_time"],
@@ -61,7 +75,10 @@ class _AdminLoanList extends State<AdminLoanList> {
           },
           body: ListView(
             children: List.generate(loans.length, (index) {
-              return LoanItem(loans.elementAt(index));
+              return LoanItem(
+                loans.elementAt(index),
+                user: loans.elementAt(index).user,
+              );
             }),
           ),
         );

lib/src/widgets/loans/loan_item.dart

@@ -2,11 +2,13 @@ import 'package:intl/intl.dart';
 import 'package:flutter/material.dart';
 
 import 'package:library_app/src/models/loan.dart';
+import 'package:library_app/src/models/user.dart';
 
 class LoanItem extends StatelessWidget {
   final Loan _loan;
+  final User? user;
 
-  const LoanItem(this._loan, {super.key});
+  const LoanItem(this._loan, {super.key, this.user});
 
   @override
   Widget build(BuildContext context) {
@@ -39,6 +41,17 @@ class LoanItem extends StatelessWidget {
                   style: const TextStyle(fontSize: 12.0, color: Colors.white),
                 ),
               ),
+              Offstage(
+                offstage: user == null,
+                child: Card(
+                  color: Theme.of(context).primaryColor,
+                  child: ListTile(
+                    textColor: Colors.white,
+                    title: Text(user != null ? user!.username : ""),
+                    subtitle: Text(user != null ? user!.email : ""),
+                  ),
+                ),
+              ),
               Padding(
                 padding: const EdgeInsets.symmetric(vertical: 8.0),
                 child: Row(

lib/src/widgets/loans/loan_list.dart

@@ -35,6 +35,7 @@ class _LoanList extends State<LoanList> {
             var book = Book.fromJson(loan["book_detail"]);
             return Loan(
               book,
+              null,
               loan["loan_date"],
               loan["due_date"],
               loan["remaining_loan_time"],