feat: implement polymorphic relationships for group items to support bundles and product variants

database/migrations/2026_07_17_000100_make_group_items_groupable.php

@@ -0,0 +1,62 @@
+<?php
+
+use App\Domains\Catalog\Models\ProductVariant;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('group_items', function (Blueprint $table) {
+            $table->nullableMorphs('groupable');
+        });
+
+        DB::table('group_items')->update([
+            'groupable_type' => ProductVariant::class,
+            'groupable_id' => DB::raw('product_variant_id'),
+        ]);
+
+        $productVariantForeignKey = collect(Schema::getForeignKeys('group_items'))
+            ->first(fn (array $foreignKey): bool => $foreignKey['columns'] === ['product_variant_id']);
+
+        Schema::table('group_items', function (Blueprint $table) use ($productVariantForeignKey) {
+            if ($productVariantForeignKey !== null) {
+                $table->dropForeign($productVariantForeignKey['name']);
+            }
+
+            $table->dropColumn('product_variant_id');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        if (DB::table('group_items')->where('groupable_type', '!=', ProductVariant::class)->exists()) {
+            throw new RuntimeException('Cannot roll back groupable group items while bundle items exist.');
+        }
+
+        Schema::table('group_items', function (Blueprint $table) {
+            $table->unsignedBigInteger('product_variant_id')->nullable();
+        });
+
+        DB::table('group_items')->update([
+            'product_variant_id' => DB::raw('groupable_id'),
+        ]);
+
+        Schema::table('group_items', function (Blueprint $table) {
+            $table->dropMorphs('groupable');
+            $table->foreign('product_variant_id')
+                ->references('id')
+                ->on('productos_variantes')
+                ->cascadeOnDelete();
+        });
+    }
+};