Version 4.6.0

applications/nexus/sources/Invoice/Item/Item.php

@@ -361,6 +361,33 @@ abstract class _Item
 		return NULL;
 	}
 	
+	/**
+	 * Is this item the same as another item in the cart?
+	 * Used to decide when an item is added to the cart if we should just increase the quantity of this item instead  of creating a new item.
+	 *
+	 * @param	\IPS\nexus\Invoice\Item		$item	The other item
+	 * @return	bool
+	 */
+	public function isSameAsOtherItem( $item )
+	{
+		/* If one is set to be associated with something in the cart and the other is set to be associated
+		with an existing purchase, trying to compare those will throw an error */
+		if ( $item->parent or $this->parent )
+		{			
+			if ( \gettype( $this->parent ) != \gettype( $item->parent ) )
+			{
+				return FALSE;
+			}
+		}
+		
+		/* Assume the quantities are the same */
+		$cloned = clone $item;
+		$cloned->quantity = $this->quantity;
+		
+		/* Compare */
+		return ( $cloned == $this );
+	}
+	
 	/**
 	 * Get output for API
 	 *