feat: Introduce memberIds for efficient group querying and management, updating related UI components and .gitignore.

lib/models/group.dart

@@ -1,54 +1,59 @@
 import 'group_member.dart';
 
 /// Model representing a travel group.
-/// 
+///
 /// A group is a collection of travelers who are part of a specific trip.
 /// It contains information about group members, creation details, and
 /// provides methods for serialization with Firestore.
 class Group {
   /// Unique identifier for the group
-  final String id; 
-  
+  final String id;
+
   /// Display name of the group
   final String name;
-  
+
   /// ID of the trip this group belongs to
   final String tripId;
-  
+
   /// ID of the user who created this group
   final String createdBy;
-  
+
   /// Timestamp when the group was created
   final DateTime createdAt;
-  
+
   /// Timestamp when the group was last updated
   final DateTime updatedAt;
-  
+
   /// List of members in this group
   final List<GroupMember> members;
 
+  /// List of member IDs for efficient querying and security rules
+  final List<String> memberIds;
+
   /// Creates a new [Group] instance.
-  /// 
+  ///
   /// [id], [name], [tripId], and [createdBy] are required.
   /// [createdAt] and [updatedAt] default to current time if not provided.
   /// [members] defaults to empty list if not provided.
   Group({
-    required this.id, 
+    required this.id,
     required this.name,
     required this.tripId,
     required this.createdBy,
     DateTime? createdAt,
     DateTime? updatedAt,
     List<GroupMember>? members,
-  })  : createdAt = createdAt ?? DateTime.now(),
-        updatedAt = updatedAt ?? DateTime.now(),
-        members = members ?? [];
+    List<String>? memberIds,
+  }) : createdAt = createdAt ?? DateTime.now(),
+       updatedAt = updatedAt ?? DateTime.now(),
+       members = members ?? [],
+       memberIds = memberIds ?? [];
 
   /// Creates a [Group] instance from a Firestore document map.
-  /// 
+  ///
   /// [map] - The document data from Firestore
   /// [id] - The document ID from Firestore
-  /// 
+  ///
   /// Returns a new [Group] instance with data from the map.
   factory Group.fromMap(Map<String, dynamic> map, String id) {
     return Group(
@@ -59,6 +64,7 @@ class Group {
       createdAt: DateTime.fromMillisecondsSinceEpoch(map['createdAt'] ?? 0),
       updatedAt: DateTime.fromMillisecondsSinceEpoch(map['updatedAt'] ?? 0),
       members: [],
+      memberIds: List<String>.from(map['memberIds'] ?? []),
     );
   }
 
@@ -69,6 +75,7 @@ class Group {
       'createdBy': createdBy,
       'createdAt': createdAt.millisecondsSinceEpoch,
       'updatedAt': updatedAt.millisecondsSinceEpoch,
+      'memberIds': memberIds,
     };
   }
 
@@ -80,6 +87,7 @@ class Group {
     DateTime? createdAt,
     DateTime? updatedAt,
     List<GroupMember>? members,
+    List<String>? memberIds,
   }) {
     return Group(
       id: id ?? this.id,
@@ -89,6 +97,7 @@ class Group {
       createdAt: createdAt ?? this.createdAt,
       updatedAt: updatedAt ?? this.updatedAt,
       members: members ?? this.members,
+      memberIds: memberIds ?? this.memberIds,
     );
   }
-}
+}