first version

app/Models/PurchaseAllocationModel.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * 采购金额分摊模型（实际采购金额按订货比例分摊到门店/单品，尾差修正保证金额守恒）
+ */
+class PurchaseAllocationModel extends Model
+{
+    protected $table = 'purchase_allocation';
+    protected $primaryKey = 'id';
+
+    protected $fillable = [
+        'purchase_item_id',
+        'order_item_id',
+        'store_id',
+        'product_id',
+        'quantity',
+        'weight',
+        'amount',
+    ];
+
+    protected $casts = [
+        'purchase_item_id' => 'integer',
+        'order_item_id' => 'integer',
+        'store_id' => 'integer',
+        'product_id' => 'integer',
+        'quantity' => 'decimal:2',
+        'weight' => 'decimal:3',
+        'amount' => 'decimal:2',
+    ];
+
+    /**
+     * 来源采购明细
+     */
+    public function purchaseItem(): BelongsTo
+    {
+        return $this->belongsTo(PurchaseOrderItemModel::class, 'purchase_item_id', 'id');
+    }
+
+    /**
+     * 溯源订货明细
+     */
+    public function orderItem(): BelongsTo
+    {
+        return $this->belongsTo(StoreOrderItemModel::class, 'order_item_id', 'id');
+    }
+
+    /**
+     * 分摊门店
+     */
+    public function store(): BelongsTo
+    {
+        return $this->belongsTo(StoreModel::class, 'store_id', 'id');
+    }
+
+    /**
+     * 分摊商品
+     */
+    public function product(): BelongsTo
+    {
+        return $this->belongsTo(ProductModel::class, 'product_id', 'id');
+    }
+}