I've been working with Drupal 7 for a couple of years but am new to Drupal 8, and am just getting into building custom modules.
What I have built is a module that alters Drupal Commerce in order to make it work smoother for sponsoring children (so that it doesn't feel like you are buying children).
It does a couple of things: 1. If you add a second product to the cart, it deletes your old cart. 2. After clicking add to cart, it redirects you to an information page. 3. That page contains a module-generated block with a "continue" button that takes the customer to checkout.
The issue I am hitting is that the code which generates the checkout button block is getting cached, and is pulling an old, no longer existing order ID number.
Is there a way to prevent the block from getting cached, or a better way to programmatically set up a custom block?
Here is my code:
\src\Plugin\Block\ContinueCheckoutBlock.php
<?php /** * @file * Contains \Drupal\commerce_custom\Plugin\Block\ContinueCheckoutBlock. */ namespace Drupal\commerce_custom\Plugin\Block; use Drupal\Core\Block\BlockBase; use Symfony\Component\HttpFoundation; /** * Provides a 'Continue Checkout' block. * * @Block( * id = "continue_checkout", * admin_label = @Translation("Continue Checkout"), * category = @Translation("Continue Checkout Custom Block") * ) */ class ContinueCheckoutBlock extends BlockBase { /** * {@inheritdoc} */ public function build() { $user = \Drupal::currentUser()->id(); $connection = \Drupal::database(); $user_ip = \Drupal::request()->getClientIp(); $query = $connection->query("select * from commerce_order_item join commerce_order on commerce_order_item.order_id = commerce_order.order_id where uid = :user and state = 'draft' and commerce_order.ip_address = :user_ip order by commerce_order.changed asc limit 1", [':user' => $user, ':user_ip' => $user_ip]); $result = $query->fetchAll(); $order_id = $result[0]->order_id; drupal_set_message($order_id); return array( '#type' =>'markup', '#markup' => '<a href=checkout/' . $order_id . '/login class=button>Continue</a>', '#cache' => array('max_age'=> 0), ); } } commerce_custom.module
<?php use Drupal\Core\Form\FormStateInterface; use Drupal\commerce_order\Entity\Order; use Symfony\Component\HttpFoundation\RedirectResponse; use Symfony\Component\HttpFoundation; /** * Implements hook_form_FORM_ID_alter(). */ function commerce_custom_form_commerce_order_item_add_to_cart_form_alter(&$form, FormStateInterface $form_state, $form_id) { $form['actions']['submit']['#value']='Sponsor'; $form['#validate'][] = 'commerce_custom_form_validate'; $form['actions']['submit']['#submit'][] = 'commerce_custom_cart_alter_redirect'; } function commerce_custom_form_validate(array &$form, FormStateInterface $form_state) { $user = \Drupal::currentUser()->id(); $connection = \Drupal::database(); $user_ip = \Drupal::request()->getClientIp(); $query = $connection->query("select * from commerce_order_item join commerce_order on commerce_order_item.order_id = commerce_order.order_id where uid = :user and state = 'draft' and commerce_order.ip_address = :user_ip order by commerce_order.changed desc limit 1", [':user' => $user, ':user_ip' => $user_ip]); $result = $query->fetchAll(); $cart_count = $result[0]->quantity; $order_id = $result[0]->order_id; if ($cart_count > 0 && $order_id) { $order = \Drupal::entityTypeManager()->getStorage('commerce_order')->load($order_id); $items = $order->getItems(); $order->delete(); } } function commerce_custom_cart_alter_redirect(&$form, FormStateInterface $form_state) { $responce = new RedirectResponse('/how-it-works'); $responce->send(); } 
