大幅変更＆環境バージョンアップ

lib/model/event.dart

@@ -0,0 +1,40 @@
+// lib/models/event.dart
+
+class Event {
+  final int id;
+  final String eventName;
+  final DateTime startDatetime;
+  final DateTime endDatetime;
+  final DateTime deadlineDateTime; // 新しく追加
+
+  Event({
+    required this.id,
+    required this.eventName,
+    required this.startDatetime,
+    required this.endDatetime,
+    required this.deadlineDateTime,
+  });
+
+  factory Event.fromJson(Map<String, dynamic> json) {
+    final endDatetime = DateTime.parse(json['end_datetime']);
+    return Event(
+      id: json['id'],
+      eventName: json['event_name'],
+      startDatetime: DateTime.parse(json['start_datetime']),
+      endDatetime: DateTime.parse(json['end_datetime']),
+      deadlineDateTime: json['deadline_datetime'] != null
+          ? DateTime.parse(json['deadline_datetime'])
+          : endDatetime.subtract(const Duration(days: 7)), // 仮の実装
+      // deadlineDateTime: DateTime.parse(json['deadline_datetime']),
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'event_name': eventName,
+      'start_datetime': startDatetime.toIso8601String(),
+      'end_datetime': endDatetime.toIso8601String(),
+    };
+  }
+}