Using Sonata Admin sonata_type_model_autocomplete property and callback option to create custom query with datagrid querybuilder

PersonAdmin.php

<?php

namespace AppBundle\Admin;

use Sonata\AdminBundle\Admin\Admin;
use Sonata\AdminBundle\Datagrid\DatagridMapper;

class PersonAdmin extends Admin
{
    protected function configureDatagridFilters(DatagridMapper $filterMapper)
    {
        $filterMapper
            ->add('full_text', 'doctrine_orm_callback', array(
                'callback' => array($this, 'getFullTextFilter'),
                'field_type' => 'text',
                'show_filter' => true,
                'global_search' => true
            ))
        ;
    }

    public function getFullTextFilter($queryBuilder, $alias, $field, $value)
    {
        if (!$value['value']) {
            return;
        }

        $queryBuilder->andWhere($queryBuilder->expr()->orX(
            $queryBuilder->expr()->like($alias.'.firstName', $queryBuilder->expr()->literal('%' . $value['value'] . '%')),
            $queryBuilder->expr()->like($alias.'.lastName', $queryBuilder->expr()->literal('%' . $value['value'] . '%')),
            $queryBuilder->expr()->like($queryBuilder->expr()->concat(
                    $alias.'.firstName', $queryBuilder->expr()->concat(
                        $queryBuilder->expr()->literal(' '), $alias.'.lastName'
                    )
                ),
                $queryBuilder->expr()->literal($value['value'] . '%')
            ),
            $queryBuilder->expr()->like($alias.'.email', $queryBuilder->expr()->literal('%' . $value['value'] . '%')),
            $queryBuilder->expr()->like($alias.'.street', $queryBuilder->expr()->literal('%' . $value['value'] . '%')),
            $queryBuilder->expr()->like($alias.'.postcode', $queryBuilder->expr()->literal('%' . $value['value'] . '%')),
            $queryBuilder->expr()->like($alias.'.city', $queryBuilder->expr()->literal('%' . $value['value'] . '%')),
            $queryBuilder->expr()->like($alias.'.country', $queryBuilder->expr()->literal('%' . $value['value'] . '%'))
        ));

        return true;
    }
}

TimekeepinEntryAdmin.php

<?php

namespace AppBundle\Admin;

use Sonata\AdminBundle\Admin\Admin;
use Sonata\AdminBundle\Form\FormMapper;

class TimekeepingEntryAdmin extends Admin
{
    protected function configureFormFields(FormMapper $formMapper)
    {
        $formMapper
            ->with('Entry')
                ->add('employee', 'sonata_type_model_autocomplete', array(
                    'property' => 'full_text',
                    'callback' => function ($admin, $property, $value) {
                        $datagrid = $admin->getDatagrid();
                        $queryBuilder = $datagrid->getQuery();

                        $queryBuilder->andWhere($queryBuilder->expr()->orX(
                            $queryBuilder->expr()->like($queryBuilder->getRootAlias() . '.firstName', $queryBuilder->expr()->literal('%' . $value . '%')),
                            $queryBuilder->expr()->like($queryBuilder->getRootAlias() . '.lastName', $queryBuilder->expr()->literal('%' . $value . '%')),
                            $queryBuilder->expr()->like($queryBuilder->expr()->concat(
                                    $queryBuilder->getRootAlias() . '.firstName', $queryBuilder->expr()->concat(
                                        $queryBuilder->expr()->literal(' '), $queryBuilder->getRootAlias() . '.lastName'
                                    )
                                ),
                                $queryBuilder->expr()->literal($value . '%')
                            )
                        ));

                        $queryBuilder
                            ->andWhere('SIZE(' . $queryBuilder->getRootAlias() . '.employmentContracts) > 0')
                        ;
                        $datagrid->setValue($property, null, $value);
                    },
                ));
    }
}