🚀 **Automate Meetup Activity Recalculation**

- Introduced `recalculateActivity` method in `Meetup` model to centralize activity and event timestamp updates.
- Added `MeetupEventObserver` to trigger activity recalculation on event save/delete.
- Updated `/meetups:update-activity` command to leverage the new model method for cleanup.
- Enhanced tests to cover various `MeetupEvent` scenarios affecting activity states.

app/Console/Commands/Database/UpdateMeetupActivity.php

@@ -3,12 +3,9 @@
 namespace App\Console\Commands\Database;
 
 use App\Models\Meetup;
-use App\Models\MeetupEvent;
-use Carbon\CarbonInterface;
 use Illuminate\Console\Attributes\Description;
 use Illuminate\Console\Attributes\Signature;
 use Illuminate\Console\Command;
-use Illuminate\Support\Facades\Date;
 
 #[Signature('meetups:update-activity')]
 #[Description('Recalculate is_active and last_event_at for every meetup based on its events.')]
@@ -16,11 +13,9 @@ class UpdateMeetupActivity extends Command
 {
     public function handle(): int
     {
-        $threshold = now()->subYear();
-
-        Meetup::query()->chunkById(200, function ($meetups) use ($threshold) {
+        Meetup::query()->chunkById(200, function ($meetups) {
             foreach ($meetups as $meetup) {
-                $this->updateMeetup($meetup, $threshold);
+                $meetup->recalculateActivity();
             }
         });
 
@@ -28,37 +23,4 @@ class UpdateMeetupActivity extends Command
 
         return Command::SUCCESS;
     }
-
-    private function updateMeetup(Meetup $meetup, CarbonInterface $threshold): void
-    {
-        $lastEventAt = MeetupEvent::query()
-            ->where('meetup_id', $meetup->id)
-            ->where('start', '<=', now())
-            ->max('start');
-
-        $lastEventAt = $lastEventAt ? Date::parse($lastEventAt) : null;
-
-        $hasFutureEvent = MeetupEvent::query()
-            ->where('meetup_id', $meetup->id)
-            ->where('start', '>', now())
-            ->exists();
-
-        $hasActiveRecurrence = MeetupEvent::query()
-            ->where('meetup_id', $meetup->id)
-            ->whereNotNull('recurrence_type')
-            ->where(function ($query) {
-                $query->whereNull('recurrence_end_date')
-                    ->orWhere('recurrence_end_date', '>=', now());
-            })
-            ->exists();
-
-        $isActive = ($lastEventAt && $lastEventAt->greaterThanOrEqualTo($threshold))
-            || $hasFutureEvent
-            || $hasActiveRecurrence;
-
-        $meetup->forceFill([
-            'is_active' => $isActive,
-            'last_event_at' => $lastEventAt,
-        ])->saveQuietly();
-    }
 }

app/Models/Meetup.php

@@ -8,6 +8,7 @@ use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Support\Facades\Cookie;
+use Illuminate\Support\Facades\Date;
 use Illuminate\Support\Facades\DB;
 use Spatie\Image\Enums\Fit;
 use Spatie\MediaLibrary\HasMedia;
@@ -166,4 +167,37 @@ class Meetup extends Model implements HasMedia
     {
         return $this->hasMany(MeetupEvent::class);
     }
+
+    public function recalculateActivity(): void
+    {
+        $threshold = now()->subYear();
+
+        $lastEventAt = MeetupEvent::query()
+            ->where('meetup_id', $this->id)
+            ->where('start', '<=', now())
+            ->max('start');
+
+        $lastEventAt = $lastEventAt ? Date::parse($lastEventAt) : null;
+
+        $hasFutureEvent = MeetupEvent::query()
+            ->where('meetup_id', $this->id)
+            ->where('start', '>', now())
+            ->exists();
+
+        $hasActiveRecurrence = MeetupEvent::query()
+            ->where('meetup_id', $this->id)
+            ->whereNotNull('recurrence_type')
+            ->whereNotNull('recurrence_end_date')
+            ->where('recurrence_end_date', '>=', now())
+            ->exists();
+
+        $isActive = ($lastEventAt && $lastEventAt->greaterThanOrEqualTo($threshold))
+            || $hasFutureEvent
+            || $hasActiveRecurrence;
+
+        $this->forceFill([
+            'is_active' => $isActive,
+            'last_event_at' => $lastEventAt,
+        ])->saveQuietly();
+    }
 }

app/Models/MeetupEvent.php

@@ -3,10 +3,13 @@
 namespace App\Models;
 
 use App\Enums\RecurrenceType;
+use App\Observers\MeetupEventObserver;
+use Illuminate\Database\Eloquent\Attributes\ObservedBy;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
+#[ObservedBy([MeetupEventObserver::class])]
 class MeetupEvent extends Model
 {
     use HasFactory;

app/Observers/MeetupEventObserver.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\MeetupEvent;
+
+class MeetupEventObserver
+{
+    public function saved(MeetupEvent $meetupEvent): void
+    {
+        $meetupEvent->meetup?->recalculateActivity();
+    }
+
+    public function deleted(MeetupEvent $meetupEvent): void
+    {
+        $meetupEvent->meetup?->recalculateActivity();
+    }
+}