sumanthkumarc

This documentation is destined for drupal.org. Created first as a gist to make initial comments easier. Rewrites and clarifications welcome. Code samples are simplified for clarity. Perhaps a bit too much?

When talking about extensibility, there are several distinct use cases:

1. Reacting to an action that has already happened.

The reaction can be anything; outputting a message, sending an email, modifying a related object, etc. Examples:

• "A node has been saved"
• "A product has been added to the cart".

sumanthkumarc

#When a slug passed in route doesn't load entity on getParameter, you need to pass the entity type as options
#in routing.yml so that the entityconverter knows what it is.

#@link https://www.drupal.org/docs/8/api/routing-system/how-a-node-id-gets-converted-to-its-actual-node-object
#in your routing.yml

route_name:
  path: /path/{foo}
  options:
    parameters:

sumanthkumarc

<?php

namespace Drupal\commerce_price\Plugin\Commerce\Condition;

use Drupal\commerce\Plugin\Commerce\Condition\ConditionBase;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

sumanthkumarc

<?php

$nodes = node_load_multiple(array(), array('type' => $type));
foreach($nodes as $nid => $node){
  // Comment status : 
  // 2 - open
  // 1 - closed
  // 0 - hidden
  $node->comment = 1;
  node_save($node);

sumanthkumarc

SELECT 
table_schema AS `Database`, 
table_name AS `Table`, 
round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB` 
FROM information_schema.TABLES WHERE table_schema = 'exampledb' 
ORDER BY (data_length + index_length) DESC
LIMIT 10;

sumanthkumarc

<?php

function hook_MY_MODULE_form_alter(){

  // Altering the actions available for a node form, either add or edit.
  $build_info = $form_state->getBuildInfo();
  if (isset($build_info['base_form_id']) && $build_info['base_form_id'] == 'node_form') {
    $form_object = $form_state->getFormObject();
    $entity = $form_object->getEntity();
    $bundle = $entity->bundle();

sumanthkumarc

<?php


/**
 *The numbers are normally composed of three parts:
 * - 1 or 2 digits for Drupal core compatibility (Drupal 8, 9, 10, etc.). This
 *   convention must be followed.
 * - 1 digit for your module's major release version; for example, for 8.x-1.*
 *   use 1, for 8.x-2.* use 2, for Core 8.0.x use 0, and for Core 8.1.x use 1.
 *   This convention is optional but suggested for clarity.

sumanthkumarc

<?php

// All these are found in core/includes/schema.inc
// Get schema version for your module.
drupal_get_installed_schema_version('MY_MODULE');

// schema version number is N in hook_update_N
drupal_set_installed_schema_version('MY_MODULE', 'Schema_version_number');

// Get all schema versions for all modules.

sumanthkumarc

<?php
function get_eu_countries() {
  $countries = [];

  $countries['AT'] = ['name' => 'Austria',];
  $countries['BE'] = ['name' => 'Belgium',];
  $countries['BG'] = ['name' => 'Bulgaria',];
  $countries['CY'] = ['name' => 'Cyprus',];
  $countries['CZ'] = ['name' => 'Czech Republic',];
  $countries['DE'] = ['name' => 'Germany',];

sumanthkumarc

nodes:
    - address: master.my-domain.com
      user: my-user
      role:
        - controlplane
        - etcd
    - address: worker1.my-domain.com
      user: my-user
      role:
        - worker