Using MultiAdd to create a "reorder" facility for Craft Commerce

historic-orders.twig

...
<form method="POST">
	<p>You can re-order by clicking the button below.</p>

	<input type="hidden" name="action" value="logic/orders/reOrder">
	<input type="hidden" name="redirect" value="shop/cart">
	<input type="hidden" name="oldOrderNumber" value="{{ order.number }}">
	{{ getCsrfInput() }}

	{% for item in order.lineItems %}{# build the full cart items #}
		{% set itemNumber = loop.index %}
		<input type="hidden" name="items[{{ loop.index }}][qty]" value="{{ item.qty }}">
		<input type="hidden" name="items[{{ loop.index }}][note]" value="{{ item.note }}">
		<input type="hidden" name="items[{{ loop.index }}][purchasableId]" value="{{ item.purchasableId }}">

		{% for key, option in item.options %}
			<input type="hidden" name="items[{{ itemNumber }}][options][{{ key }}]" value="{{ option }}">
		{% endfor %}{# key, option in item.options #}
	{% endfor %}{# item in order.lineItems #}
	
	<input type="submit" value="Re Order" class="button" />
</form>
...

Logic_OrdersController.php

<?php
// logic/controllers/Logic_OrdersController.php

namespace Craft;

class Logic_OrdersController extends BaseController
{
	public function actionReorder()
	{
		LogicPlugin::log("Action reorder triggered", LogLevel::Info);

		// basic security precautions
			$this->requirePostRequest();

		// setup some required variables
			$oldOrderNumber = craft()->request->getPost('oldOrderNumber');
			$oldOrder       = craft()->commerce_orders->getOrderByNumber( $oldOrderNumber );

		// get the 'old' order from the POSTed field
			if(!$oldOrder) {
				LogicPlugin::log("Couldn't get the order record for the order being edited", LogLevel::Error);
				$user->addError('editOrder','Couldnt get the order being edited');
			}

		// empty the current cart (deletes the cookie, means anything in there is abandoned)
			craft()->commerce_cart->forgetCart();

		// make a new cart (or get the current cart if we don't delete it first)
			$cart = craft()->commerce_cart->getCart();

		// set the shipping etc on the cart to the same as the old order
			$cart->shippingAddressId = $oldOrder->shippingAddressId;
			$cart->shippingAddress   = $oldOrder->shippingAddress;

			if (!craft()->commerce_cart->setShippingMethod($cart, $oldOrder->shippingMethodHandle, $error)) {
				$cart->addError('shippingMethod', $error);
				LogicPlugin::log("error adding shipping method to cart: " . $error, LogLevel::Error);
			}

		// ok now pass it all over to the multiAdd controller...
			craft()->runController('multiAdd/multiAdd');
	}
}

LogicPlugin.php

<?php
// logic/LogicPlugin.php

/**
 * logic plugin for Craft CMS
 *
 * logic
 *
 * @author    VCA
 * @copyright Copyright (c) 2016 VCA
 * @link      http://viewcreative.co.uk
 * @package   Example
 * @since     1
 */

namespace Craft;

class LogicPlugin extends BasePlugin
{
    /**
     * @return mixed
     */
    public function init()
    {
    }

    /**
     * @return mixed
     */
    public function getName()
    {
         return Craft::t('logic');
    }

    /**
     * @return mixed
     */
    public function getDescription()
    {
        return Craft::t('Implement a ReOrder facility calling the MultiAdd plugin');
    }

    /**
     * @return string
     */
    public function getDocumentationUrl()
    {
        return '???';
    }

    /**
     * @return string
     */
    public function getReleaseFeedUrl()
    {
        return '???';
    }

    /**
     * @return string
     */
    public function getVersion()
    {
        return '0.1';
    }

    /**
     * @return string
     */
    public function getSchemaVersion()
    {
        return '0.1';
    }

    /**
     * @return string
     */
    public function getDeveloper()
    {
        return 'VCA';
    }

    /**
     * @return string
     */
    public function getDeveloperUrl()
    {
        return 'http://viewcreative.co.uk';
    }

    /**
     * @return bool
     */
    public function hasCpSection()
    {
        return false;
    }

    /**
     */
    public function onBeforeInstall()
    {
    }

    /**
     */
    public function onAfterInstall()
    {
    }

    /**
     */
    public function onBeforeUninstall()
    {
    }

    /**
     */
    public function onAfterUninstall()
    {
    }
}