Form: fill defaults from object

readme.md

composer require symfony/property-access

method will silently set null if property is empty

BaseForm.php

<?php

namespace Libs\Forms;

use Nette\Forms\Controls;
use Nette\Utils\Strings;
use Symfony\Component\PropertyAccess\PropertyAccess;

class BaseForm extends Form
{


	/**
	 * Tries to access entity property and set its value as related form input default value
	 *
	 * @param $entity
	 * @param $array ['name'] in case of same names or ['formFieldName' => 'entityFieldName'], for collection set append [] after collection field
	 */
	public function fillDefaultsFromObject($entity, $array)
	{
		$accessorBuilder = PropertyAccess::createPropertyAccessorBuilder();
		$accessorBuilder->disableExceptionOnInvalidIndex();
		$accessor             = $accessorBuilder->getPropertyAccessor();
		$innerEntityFieldName = 'id';

		foreach ($array as $formFieldName => $entityFieldName) {
			$array = FALSE;
			if (Strings::contains($entityFieldName, '[]')) { // users[].id or users[]
				$array   = TRUE;
				$explode = array_filter(explode('[]', $entityFieldName, 2));
				list($entityFieldName, $innerEntityFieldName) = (count($explode) === 2 ? $explode : [
					$explode[0],
					$innerEntityFieldName,
				]);  // users & .id or users & id

				$innerEntityFieldName = Strings::trim($innerEntityFieldName, '.');
			}
			$formFieldName = is_int($formFieldName) ? $entityFieldName : $formFieldName;

			try {
				$value = NULL;
				if ($array) {
					$value = array_map(function ($item) use ($innerEntityFieldName, $accessor) {
						return $accessor->getValue($item, $innerEntityFieldName);
					}, iterator_to_array($accessor->getValue($entity, $entityFieldName)));
				} else {
					$value = $accessor->getValue($entity, $entityFieldName);
				}
				$this->getComponent($formFieldName)->setDefaultValue($value);
			} catch (\Exception $e) {

			}

		}
	}
}

usage.php

<?php

$form = new BaseForm;

$form->addText('name', 'name');
$form->addText('surname', 'surname');
$form->addSelect('user', 'user', $userList);
$form->addMultiSelect('hobbies', 'hobbies', $hobbiesList);
$form->addMultiSelect('tags', 'tags', ['lorem', 'ipsum', 'dolor']);

$form->fillDefaultsFromObject($editedEntity, [
	'name', // form field name is same as entity property
	'surname' => 'familyName' // form field name is different from entity property
	'user' => 'user.id', // toOne access, returns $editedEntity->user->id
	'hobbies[]', // collection support, returns list of ids in $editedEntity->hobbies
	'tags[].title', // same as previous, but returns list of title properties
]);