adding a cart

database/factories/CartFactory.php

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+<?php
+
+namespace Database\Factories;
+
+use App\Models\Cart;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<Cart>
+ */
+class CartFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            'user_id' => \App\Models\User::factory(),
+        ];
+    }
+}

database/migrations/2026_04_10_135926_create_carts_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('carts', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->constrained();
+            $table->timestamp('stale_date')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('carts');
+    }
+};

database/migrations/2026_04_10_140658_create_cart_product_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('cart_product', function (Blueprint $table) {
+            $table->foreignId('cart_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('product_id')->constrained()->cascadeOnDelete();
+            $table->unsignedInteger('quantity')->default(1);
+            $table->primary(['cart_id', 'product_id']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('cart_product');
+    }
+};

database/migrations/2026_04_10_142833_add_unique_user_id_to_carts_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('carts', function (Blueprint $table) {
+            $table->unique('user_id');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('carts', function (Blueprint $table) {
+            $table->dropUnique(['user_id']);
+        });
+    }
+};

database/migrations/2026_04_10_144128_make_user_id_nullable_on_carts_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('carts', function (Blueprint $table) {
+            $table->dropUnique(['user_id']);
+            $table->foreignId('user_id')->nullable()->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('carts', function (Blueprint $table) {
+            $table->foreignId('user_id')->nullable(false)->change();
+            $table->unique('user_id');
+        });
+    }
+};