[FLOW3-general] How to set/get/show M:N relations using checkboxes instead of selectbox?

[Stephen Bungert]

Hi.

I needed to do this to.

I have books and these ccan be related to genres.

I render a list of genres with checboxes. I created this viewHelper to 
render the checkboxes checked attribute:

Maybe not the best way, but it may help you too.

Stephen.

<?php
namespace Gamebook\Gamebook\ViewHelpers\Form;

/*                                                                        *
  * This script belongs to the TYPO3 Flow package "Gamebook.Gamebook".     *
  *                                                                        *
  * 
    */

use TYPO3\Flow\Annotations as Flow;

/**
  * This ViewHelper decides if a checkbox/radio should be checked.
  *
  * = Examples =
  *
  * <code title="Example">
  *	<f:form.checkbox checked="{gb:form.checked(record: genre, 
selectedRecords: book.genres)}" name="genresToAttach[genre]" 
value="{genre}" />
  * </code>
  * <output>
  * 	<input type="checkbox" checked="checked" 
value="6fa1d167-8ab6-4dd6-8099-202dd951fc3c" 
name="genresToAttach[genre][__identity]">
  * </output>
  */
class CheckedViewHelper extends 
\TYPO3\Fluid\Core\ViewHelper\AbstractViewHelper {

	/**
	 * @Flow\Inject
	 * @var \TYPO3\Flow\Persistence\PersistenceManagerInterface
	 */
	protected $persistenceManager;

	/**
	 * Returns the attribute value for the 'checked' attribute in radio and 
checkboxes.
	 *
	 * @param object $record The record to check against to see if it 
should be checked or not.
	 * @param \Doctrine\ORM\PersistentCollection $selectedRecords All the 
selected records that the parent record has selected.
	 * @return string $checkedState The value for the attribute 'checked' 
in a checkbox or radio.
	 */
	public function render($record, \Doctrine\ORM\PersistentCollection 
$selectedRecords) {
		$checkedState = '';
		
		if (is_object($record) && !empty($selectedRecords))
		{
			$recordIdentity = 
$this->persistenceManager->getIdentifierByObject($record);
			
			foreach ($selectedRecords as $possibleMatch) {
				if ($recordIdentity == 
$this->persistenceManager->getIdentifierByObject($possibleMatch))
				{
					$checkedState = 'checked';
					break;
				}
			}
		}
		
		return $checkedState;
	}
}

?>