first version

app/Models/StoreOrderItemModel.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * 门店订单明细模型（快照下单时的商品名/规格/等级价，历史单据不受调价影响）
+ */
+class StoreOrderItemModel extends Model
+{
+    use HasFactory;
+
+    protected $table = 'store_order_item';
+    protected $primaryKey = 'id';
+
+    protected $fillable = [
+        'order_id',
+        'store_id',
+        'product_id',
+        'product_name',
+        'product_spec',
+        'price',
+        'quantity',
+        'weight',
+        'amount',
+        'remark',
+    ];
+
+    protected $casts = [
+        'order_id' => 'integer',
+        'store_id' => 'integer',
+        'product_id' => 'integer',
+        'price' => 'decimal:2',
+        'quantity' => 'decimal:2',
+        'weight' => 'decimal:3',
+        'amount' => 'decimal:2',
+    ];
+
+    /**
+     * 所属订单
+     */
+    public function order(): BelongsTo
+    {
+        return $this->belongsTo(StoreOrderModel::class, 'order_id', 'id');
+    }
+
+    /**
+     * 下单门店
+     */
+    public function store(): BelongsTo
+    {
+        return $this->belongsTo(StoreModel::class, 'store_id', 'id');
+    }
+
+    /**
+     * 下单商品
+     */
+    public function product(): BelongsTo
+    {
+        return $this->belongsTo(ProductModel::class, 'product_id', 'id');
+    }
+}