Batch-load comment reaction counts on artwork comments.

Avoid per-comment reaction queries on the deferred comments API by aggregating counts in one service call.
2026-08-29 12:25:37 +02:00
parent bfcbfec357
commit bf902f509a
3 changed files with 249 additions and 5 deletions
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services;
+
+use App\Enums\ReactionType;
+use Illuminate\Support\Facades\DB;
+
+/**
+ * Bulk reaction read model for artwork comment trees.
+ *
+ * The returned value intentionally matches ReactionController's `totals`
+ * contract so SSR and API comment payloads can hydrate ReactionBar directly.
+ */
+final class CommentReactionService
+{
+    /**
+     * @param  iterable<int|string>  $commentIds
+     * @return array<int, array<string, array{emoji:string, label:string, count:int, mine:bool}>>
+     */
+    public function forComments(iterable $commentIds, ?int $userId = null): array
+    {
+        $ids = collect($commentIds)
+            ->map(static fn ($id): int => (int) $id)
+            ->filter(static fn (int $id): bool => $id > 0)
+            ->unique()
+            ->values()
+            ->all();
+
+        if ($ids === []) {
+            return [];
+        }
+
+        $counts = DB::table('comment_reactions')
+            ->whereIn('comment_id', $ids)
+            ->selectRaw('comment_id, reaction, COUNT(*) as total')
+            ->groupBy('comment_id', 'reaction')
+            ->get()
+            ->groupBy('comment_id');
+
+        $mine = collect();
+        if ($userId !== null) {
+            $mine = DB::table('comment_reactions')
+                ->whereIn('comment_id', $ids)
+                ->where('user_id', $userId)
+                ->get(['comment_id', 'reaction'])
+                ->groupBy('comment_id');
+        }
+
+        $result = [];
+        foreach ($ids as $commentId) {
+            $commentCounts = $counts->get($commentId, collect())->keyBy('reaction');
+            $commentMine = $mine->get($commentId, collect())->pluck('reaction')->flip();
+
+            $totals = [];
+            foreach (ReactionType::cases() as $type) {
+                $slug = $type->value;
+                $totals[$slug] = [
+                    'emoji' => $type->emoji(),
+                    'label' => $type->label(),
+                    'count' => (int) ($commentCounts->get($slug)->total ?? 0),
+                    'mine' => $commentMine->has($slug),
+                ];
+            }
+
+            $result[$commentId] = $totals;
+        }
+
+        return $result;
+    }
+}