Can't load form from my Install Profile

Question

I have a WelcomeForm inside my src folder in my install profile. My install profile is located inside web/profiles folder and is correctly selected by default during install.

However, I added an install task (inside my business_profile.install file) as so...

function business_profile_install_tasks_alter() {
  $new_task['install_welcome'] = [
    'display' => TRUE, 
    'type' => 'form',
    'function' => '\Drupal\business_profile\src\Form\WelcomeForm'
  ];

But the installer shows an error -

InvalidArgumentException. Form \Drupal\business_profile\src\Form\WelcomeForm is not a valid form in... ->getFormId()

My WelcomeForm extends FormBase and implements getFormId() returning a valid string. Also implements buildForm() and returns a valid $form array. Nothing wrong anywhere.And here's my WelcomeForm...

<?php

namespace Drupal\business_profile\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;

class WelcomeForm extends FormBase {

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'business_profile_installer_welcome_form';
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {

    $form['#title'] = $this->t('Welcome');

    $form['actions'] = [
      '#type' => 'actions'
    ];

    $form['actions']['save'] = [
      '#type' => 'submit',
      '#value' => $this->t('Save and continue'),
      '#button_type' => 'primary',
      '#submit' => ['::submitForm'],
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $form_state->setRedirect('<front>');
  }
  
  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state) {}

}

And I can confirm the form is saved as web/profiles/business_profile/src/Form/WelcomeForm.php

What could possibly make Drupal installer not to see my Form then? Is this an autoload issue (just suspecting) - but I thought files in a selected install profile (distribution) are autoloaded?

Spent a few days on this, any help pls guys?

Answer 1

Ok, guys - I just sorted this out! But you have all been awesome, thanks a bunch! Following leymanxx suggestions, I replaced 'function' => '\Drupal\business_profile\src\Form\WelcomeForm' with 'function' => WelcomeForm::class, and then made an import on top.

I also had to add an autoload entry to my web/profiles/business_profile/composer.json file like this...

    "autoload": {
        "psr-4": {
            "Drupal\\business_profile\\": "src"
        }
    },

I then did a composer update and saw Generating autoload files message on my terminal. And bam!! Form shows up.

Now I get to design my form. Thanks a bunch @leymanxx, @cilefen, @Tritof and everyone else that helped out on this.

Answer 2

See #2965929; it's probably the class name not matching the file name. The file needs to be named WelcomeForm.php.

Please also remove the src from the function assignment. It needs to be 'function' => '\Drupal\business_profile\Form\WelcomeForm'.