CMS article insert/update (chiangmai, where-else): store sub_category_ids as strict CSV ('15,21' not '15, 21') so FIND_IN_SET matches every chosen sub-category, not just the first; migration strips spaces from existing rows

think-backend.greaterchiangmai.com/database/migrations/2026_10_26_000000_normalize_article_sub_category_ids.php

@@ -0,0 +1,22 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+// Article insert/update used to store sub_category_ids as "15, 21" (comma+space).
+// Every reader uses FIND_IN_SET(?, sub_category_ids), which never matches " 21",
+// so only the first checked sub-category was ever visible. Strip the spaces.
+return new class extends Migration
+{
+    public function up(): void
+    {
+        DB::table('article')
+            ->where('sub_category_ids', 'like', '% %')
+            ->update(['sub_category_ids' => DB::raw("REPLACE(sub_category_ids, ' ', '')")]);
+    }
+
+    public function down(): void
+    {
+        // Irreversible by design: the spaced format was a bug, not a schema.
+    }
+};