Adding forms for creating and editing entities

In our BO controllers, we use two forms: one for the category and one for the posts. As the category form is really simple, we will focus on the blog post creation/edition form. It follows the same concept as in the previous chapter form builder extension, but it’s a nice way to rediscover it in another context.

As a reminder, a form is defined by a structure definition type for our form and the data provider for inputs to prefill before display.

First, let’s create the /modules/whblog/src/Form/Type/WHBlogPostType.php file to implement the field structure for our form as follows:

class WHBlogPostType extends TranslatorAwareType
{
  private $categoryRepository;
  private $categoriesChoiceTree;
  public function __construct($translator, $locales,
  $categoryRepository)
  {
    parent::__construct($translator, $locales);
    $this...