Implement notifications

src/Core/Repositories/EloquentNotificationRepository.php

@@ -0,0 +1,25 @@
+<?php namespace Flarum\Core\Repositories;
+
+use Flarum\Core\Models\Notification;
+use DB;
+
+class EloquentNotificationRepository implements NotificationRepositoryInterface
+{
+    public function findByUser($userId, $count = null, $start = 0)
+    {
+        $primaries = Notification::select(DB::raw('MAX(id) AS id'), DB::raw('SUM(is_read = 0) AS unread_count'))
+            ->where('user_id', $userId)
+            ->whereIn('type', array_keys(Notification::getTypes()))
+            ->groupBy('type', 'subject_id')
+            ->orderBy('time', 'desc')
+            ->skip($start)
+            ->take($count);
+
+        return Notification::with('subject')
+            ->select('notifications.*', 'p.unread_count')
+            ->mergeBindings($primaries->getQuery())
+            ->join(DB::raw('('.$primaries->toSql().') p'), 'notifications.id', '=', 'p.id')
+            ->orderBy('time', 'desc')
+            ->get();
+    }
+}

src/Core/Repositories/NotificationRepositoryInterface.php

@@ -0,0 +1,6 @@
+<?php namespace Flarum\Core\Repositories;
+
+interface NotificationRepositoryInterface
+{
+    public function findByUser($userId, $count = null, $start = 0);
+}