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app/Models/Ecommerce/Product/Order/OrderItem.php

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+<?php
+
+namespace App\Models\Ecommerce\Product\Order;
+
+use App\Models\Ecommerce\Channel\Channel;
+use App\Models\Ecommerce\Product\Product\Product;
+use Illuminate\Database\Eloquent\Casts\Attribute;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class OrderItem extends Model
+{
+    use HasFactory;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array<string>
+     */
+    protected $fillable = [
+        'product_name',
+        'product_id',
+        'order_id',
+        'channel_id',
+        'quantity',
+        'unit_price_amount',
+        'unit_cost_amount',
+    ];
+
+    /**
+     * Related order (parent)
+     */
+    public function order(): BelongsTo
+    {
+        return $this->belongsTo(Order::class, 'order_id');
+    }
+
+    /**
+     * Related product
+     */
+    public function product(): BelongsTo
+    {
+        return $this->belongsTo(Product::class, 'product_id', 'id');
+    }
+
+    /**
+     * Related Channel
+     */
+    public function channel(): BelongsTo
+    {
+        return $this->belongsTo(Channel::class, 'channel_id', 'id');
+    }
+
+    /**
+     * Total price
+     */
+    public function total(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => (float) $this->unit_price_amount * (int) $this->quantity
+        );
+    }
+}