findNeatline method to find a Neatline record by slug or ID

findNeatline.php

<?php

/**
 * Finds a Neatline record by slug or ID.
 *
 * Checks for existence of 'slug' in URL, then tries to find a Neatline
 * record with that slug. If there is no 'slug' parameter, it falls back
 * to Omeka_Controller_Action::findById()
 *
 * @throws Omeka_Controller_Exception_404
 * @return NeatlineExhibit
 */
public function findNeatline()
{

    if ($slug = $this->getRequest()->getParam('slug')) {
      
        $record = $this->_table->findBySlug($slug);
        
        if (!$record) {
            throw new Omeka_Controller_Exception_404(get_class($this) . ": No record with Slug '$slug' exists" );
        }

    } else {

        $record = $this->findById();

    }

    return $record;

}