Наследование: extends Cake\View\Widget\SelectBoxWidget, use trait BootstrapUI\View\Helper\OptionsAwareTrait
 public function render(array $data, ContextInterface $context)
 {
     $data += ['name' => '', 'val' => null, 'type' => 'select', 'escape' => true, 'class' => '', 'templateVars' => []];
     $data['value'] = $data['val'];
     $data['type'] = 'select';
     $data['class'] = $this->_generateFieldClass('ft-select2', str_replace(['[', ']'], '', $data['name']));
     $data['options'] = $this->_optionsOptions($data['name'], $data);
     //debug($data);
     $ftOptions = isset($data['ftOptions']) ? $data['ftOptions'] : [];
     if (!isset($ftOptions['theme'])) {
         $ftOptions['theme'] = 'bootstrap';
     }
     // Clean data
     unset($data['ftOptions']);
     unset($data['col']);
     // Script/styles include
     echo $this->_View->Html->css('FieldTypes.../vendor/select2/dist/css/select2.min.css', ['block' => 'css']);
     echo $this->_View->Html->css('FieldTypes.../vendor/select2-bootstrap-theme/dist/select2-bootstrap.min.css', ['block' => 'css']);
     echo $this->_View->Html->script('FieldTypes.../vendor/select2/dist/js/select2.full.min.js', ['block' => 'headjs']);
     // Script call
     $this->_View->Html->scriptStart(['block' => true]);
     echo '$(document).ready(function() { $(".' . $data['class'] . '").select2(' . json_encode($ftOptions, true) . ') });';
     $this->_View->Html->scriptEnd();
     return parent::render($data, $context);
 }