Newscoop\GimmeBundle\EventListener\Sortable\Doctrine\ORM\Query\OrderByWalker::walkSelectStatement PHP Method

    public function walkSelectStatement(SelectStatement $AST)
    {
        $query = $this->_getQuery();
        $sort = $query->getHint('newscoop.api.sort');
        $orderByItems = array();
        $components = $this->_getQueryComponents();
        foreach ($sort as $field => $direction) {
            $entityData = $this->findAliasForField($field);
            $realField = \Newscoop\Gimme\PropertyMatcher::match($entityData[1], $field);
            if ($field != $realField) {
                $entityData = $this->findAliasForField($realField);
                $field = $realField;
            }
            $alias = $entityData[0];
            if ($alias !== false) {
                if (!array_key_exists($alias, $components)) {
                    throw new \UnexpectedValueException("There is no component aliased by [{$alias}] in the given Query");
                }
                $meta = $components[$alias];
                if (!$meta['metadata']->hasField($field)) {
                    throw new \UnexpectedValueException("There is no such field [{$field}] in the given Query component, aliased by [{$alias}]");
                }
            } else {
                if (!array_key_exists($field, $components)) {
                    throw new \UnexpectedValueException("There is no component field [{$field}] in the given Query");
                }
            }
            if ($alias !== false) {
                $pathExpression = new PathExpression(PathExpression::TYPE_STATE_FIELD, $alias, $field);
                $pathExpression->type = PathExpression::TYPE_STATE_FIELD;
            } else {
                $pathExpression = $field;
            }
            $orderByItem = new OrderByItem($pathExpression);
            $orderByItem->type = $direction;
            $orderByItems[] = $orderByItem;
        }
        $AST->orderByClause = new OrderByClause($orderByItems);
    }