first version

database/factories/StoreOrderItemModelFactory.php

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+<?php
+
+namespace Database\Factories;
+
+use App\Models\StoreOrderItemModel;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * 门店订单明细工厂（order_id / store_id / product_id 需调用方指定；
+ * amount 未显式指定时按 price × quantity 自动计算；无需 Faker）
+ *
+ * @extends Factory<StoreOrderItemModel>
+ */
+class StoreOrderItemModelFactory extends Factory
+{
+    protected $model = StoreOrderItemModel::class;
+
+    public function definition(): array
+    {
+        return [
+            'order_id' => 0,
+            'store_id' => 0,
+            'product_id' => 0,
+            'product_name' => '测试商品',
+            'product_spec' => '500g/袋',
+            'price' => number_format(random_int(100, 5000) / 100, 2, '.', ''),
+            'quantity' => number_format(random_int(100, 10000) / 100, 2, '.', ''),
+            'weight' => 0,
+            'amount' => 0,
+            'remark' => '',
+        ];
+    }
+
+    public function configure(): static
+    {
+        return $this->afterMaking(function (StoreOrderItemModel $item): void {
+            if ((float) $item->amount === 0.0 && (float) $item->price > 0 && (float) $item->quantity > 0) {
+                $item->amount = bcmul((string) $item->price, (string) $item->quantity, 2);
+            }
+        });
+    }
+}