Update CartModel.php

src/Models/CartModel.php

@@ -34,4 +34,107 @@ class CartModel extends Model
     {
         return $this->hasMany(CartItem::class);
     }
+ 
+    /**
+     * This will is the price of the CartItem as Money
+     */
+    public function price(): Attribute
+    {
+        return new Attribute(
+            get: fn (): Money => {
+                $sum = new Money(0, 'USD');
+             
+                foreach (this->items as $item) {
+                    $sum->add($item->price_all);
+                }
+             
+                return $sum;
+            },
+        );
+    }
+
+    /**
+     * This is the discount granted for this CartItem. It is based on the given price and, in case
+     * discount is a float, multiplied or, in case it is an absolute Money, subtracted. It will return
+     * a minimum value of 0.
+     */
+    public function discount(): Attribute
+    {
+        return new Attribute(
+            get: fn (): Money => {
+                $sum = new Money(0, 'USD');
+             
+                foreach (this->items as $item) {
+                    $sum->add($item->discount);
+                }
+             
+                return $sum;
+            },
+        );
+    }
+
+    /**
+     * This is the final price of the CartItem but without any tax applied. This does on the
+     * other hand include any discounts.
+     */
+    public function subtotal(): Attribute
+    {
+        return new Attribute(
+            get: fn (): Money => {
+                $sum = new Money(0, 'USD');
+             
+                foreach (this->items as $item) {
+                    $sum->add($item->subtotal);
+                }
+             
+                return $sum;
+            },
+        );
+    }
+
+    /**
+     * This is the tax, based on the subtotal (all previous calculations) and set tax rate.
+     */
+    public function tax(): Attribute
+    {
+        return new Attribute(
+            get: fn (): Money => {
+                $sum = new Money(0, 'USD');
+             
+                foreach (this->items as $item) {
+                    $sum->add($item->tax);
+                }
+             
+                return $sum;
+            },
+        );
+    }
+
+    /**
+     * This is the total price, consisting of the subtotal and tax applied.
+     */
+    public function total(): Attribute
+    {
+        return new Attribute(
+            get: fn (): Money => {
+                $sum = new Money(0, 'USD');
+             
+                foreach (this->items as $item) {
+                    $sum->add($item->total);
+                }
+             
+                return $sum;
+            },
+        );
+    }
+
+    /**
+     * This is the total price, consisting of the subtotal and tax applied.
+     */
+    public function weight(): Attribute
+    {
+        return new Attribute(
+            get: fn () => $this->qty * $this->weight,
+        );
+    }
 }