Field Union Construction Kit

This is a work in progress attempt to use a config-entity to define field-types that union together existing field types.

Kind of like paragraphs or field collection, without the extra entity.

Similar to multifield in D7, but backed by D8's typed-data.

See The readme for what is working and where you can help.

The tricky bits (the data-model) are done, the UI work (config entity UI, formatter, widget) is where the love is needed.

Example of the data-model.

$accepted = Term::create([
  'vid' => $this->vocabulary->id(),
  'name' => 'Accepted',
]);
$entity = EntityTest::create([
  'name' => 'entity',
  'applicant' => [
    'first_name' => 'Jerry',
    'surname' => 'Johnson',
    'resume' => [
      'uri' => 'http://example.com/jerry.johnson',
      'title' => 'My resume',
    ],
    'bio' => [
      'value' => '<p>My bio<strong>is amazing!</strong></p><div>but divs are not allowed</div>',
      'format' => 'filtered_html',
    ],
    'category' => $accepted,
  ],
]);
$entity->save();

As you can see, you just specify the applicant data values using a nested-array.

Accessing the data is just as nice!

$entity->applicant->first_name->value; // Value would be 'Jerry'
$entity->applicant->surname->value; // Value would be 'Johnson'
$entity->applicant->surname = 'Smith'; // Update a value.
$entity->applicant->category->entity->id(); // Chain through entity-reference fields - value would be the term ID.
$entity->applicant->category->entity->label(); // Value would be 'Accepted'
$entity->applicant->resume->uri; // Works with multi-column fields - value would be 'http://example.com/jerry.johnson'
$entity->applicant->bio->processed; // And computed fields work too! - value would be '<p>My bio<strong>is amazing!</strong></p>but divs are not allowed'