I have this Group object
class Group {
final String dateFormatted;
final List<Event> events;
Group({required this.dateFormatted, required this.events});
}
I need to fold the group so that all Groups with common dateFormatted will be merged into the same group and create a new Group Object with that data.
I have the following issue on screen with the current structure
List<Group> mergedGroups(List<Group> seperateGroups) {
List<Group> mergedGroups = [];
for (var group in seperateGroups) {
Group isExistingGroup = mergedGroups.firstWhere(
(g) => g.dateFormatted == group.dateFormatted,
orElse: () => null,
);
if (isExistingGroup != null) {
isExistingGroup.events.addAll(group.events);
} else {
mergedGroups.add(Group(
dateFormatted: group.dateFormatted,
events: group.events.toList(),
));
}
}
return mergedGroups;
}
This might work. You want to combine a list of group object. Here you pass groups to the function as parameter and it checks whether a group exists with formattedDate or not. If exists, add events to that group else it creates a group. (If your formattedDate has hour:min:s:ms values it does not work. Be sure formattedDate has only year/month/day values.
Here how you can group common date events
List<Group> mergeGroups(List<Group> groups) {
// Create a map to group events by dateFormatted
final Map<String, List<Event>> groupedEvents = {};
for (var group in groups) {
if (!groupedEvents.containsKey(group.dateFormatted)) {
groupedEvents[group.dateFormatted] = [];
}
groupedEvents[group.dateFormatted]!.addAll(group.events);
}
// Convert the map back to a list of Group objects
return groupedEvents.entries
.map((entry) => Group(dateFormatted: entry.key, events: entry.value))
.toList();
}
