BBGuy

<?php

  // Get the request object.
  $request = \Drupal::request();
  // Query - get all parameter. 
  $q = $request->query->all();
  // Check if a query parameter exists.
  if ($request->query->has('commerce_product_v_id')) {
    // Get the query parameter.
    $pvid = $request->query->get('commerce_product_v_id');

BBGuy

<?php

use Drupal\Core\Database\Database;

/**
 * Implements hook_schema().
 *
 *  Notes:
 * 'not null' = requiered
 */

BBGuy

<?php

// Field group does not by default show on commerce relaed entities and those can be added using a hook

/**
 * Implements hook_field_group_content_element_keys_alter
 *
 * Add field groups to product and product variation.
 */
function fcl_commerce_field_group_content_element_keys_alter(&$keys) {

BBGuy

<?php

// Basics
// Get a value.
$value = $wrapper->field_x->value();
// If the field is a reference field you will get the field object
// To get the wrapper back use:
$wrapper_b = $wrapper->field_ref;

// To set a value.

BBGuy

<?php

// Util functions to load a select lists options from a taxonomy or a node field with a text list.

function build_form() {
  $form = [];
  
  // Load a two level deep select tree from a taxonomy
  $options = load_taxonomy_as_select_options('example_taxonomy');
  $form['select_tree'] = [

BBGuy

<?php
// Get all countries.
\Drupal::service('address.country_repository')->getList();

BBGuy

<?php

// some examples on
// https://docs.drupalcommerce.org/commerce2/developer-guide/products/product-architecture/code-recipes
// https://docs.drupalcommerce.org/commerce2/developer-guide/products/product-management/code-recipes
// https://docs.drupalcommerce.org/commerce2/developer-guide/products/displaying-products/code-recipes

// Work with orders.
    /** @var \Drupal\commerce_order\Entity\OrderInterface $order */
    $order = \Drupal::entityTypeManager()->getStorage('commerce_order')->load($order_id);

BBGuy

<?php

public function buildForm(array $form, FormStateInterface $form_state) {

    // If the form was submited the form build has access to the user entered data.
    $user_input = $form_state->getUserInput();
    $has_been_submitted = !empty($user_input);
    
    // multiple submit buttons
    $form['cases']['submit'] = [

BBGuy

<?php

use Drupal\file\Entity\File;

// Load a file using its ID
  $file = File::load($fid);


// Find a file using its URI

BBGuy

#sources 
# https://www.drupal.org/docs/contributed-modules/twig-tweak-2x/cheat-sheet
# https://straightupcraft.com/articles/how-to-check-if-a-variable-or-value-exists-using-twig

# Render a view
  {{ drupal_view('who_s_new', 'block_1') }}

# Get the result of a view
  {{ drupal_view_result('who_s_new', 'block_1') }}