/**
* Builds a map relating the database field alias (the alias in the SELECT statement) and the
* actual entity field (as in JOINED_ENTITY.field or FROM_ENTITY.field) in order to use them
* within the WHERE statement.
*
* @param Query $query
*
* @return array
*/
protected function buildSelectFieldMap(Query $query)
{
$selectFieldsMap = [];
$requiredFields = $this->requiredFieldsExtractor->extractRequiredFields($query);
$joins = $this->joinsGenerator->generate($query);
foreach ($this->queryBuilderDataSourceFields as $element) {
if (!in_array($element->getUniqueName(), $requiredFields, true)) {
continue;
}
if (is_null($element->getDatabaseFilterQueryField())) {
continue;
}
$fieldIdentifier = $element->getDatabaseSelectAlias();
if (is_array($fieldIdentifier)) {
$fieldIdentifier = str_replace('.', '_', $element->getDatabaseFilterQueryField());
}
$fieldParts = explode('.', $element->getDatabaseFilterQueryField());
if (count($fieldParts) === 1) {
$selectFieldsMap[$fieldIdentifier] = $this->fromAlias . '.' . array_slice($fieldParts, -1, 1)[0];
} else {
$joinField = implode('.', array_slice($fieldParts, 0, -1));
foreach ($joins as $path => $join) {
if ($path == $joinField) {
$selectFieldsMap[$fieldIdentifier] = $join->getAlias() . '.' . array_slice($fieldParts, -1, 1)[0];
break;
}
}
}
}
return $selectFieldsMap;
}
/**
* Gets the fully generated query builder. Will autogenerate select and
* join statements as needed.
*
* This function is cached, and will only be generated once per execution.
*
* @param Query $query
*
* @return QueryBuilder|null
*/
public function buildQueryBuilder(Query $query, $entityClass)
{
$queryBuilder = $this->entityManager->createQueryBuilder();
$queryBuilder->from($entityClass, $this->getFromAlias());
$select = $this->selectGenerator->generate($query);
$event = new GenerateSelectsEvent($select, $this->getFromAlias());
$this->dataSource->getEventDispatcher()->dispatch(DoctrineDriver::EVENT_GENERATE_SELECTS, $event);
$select = $event->select;
$queryBuilder->add('select', $select);
$joins = $this->joinGenerator->generate($query);
$event = new GenerateJoinsEvent($this->getFromAlias(), $joins);
$this->dataSource->getEventDispatcher()->dispatch(DoctrineDriver::EVENT_GENERATE_JOINS, $event);
$joins = $event->joins;
foreach ($joins as $join) {
$queryBuilder->leftJoin($join->getJoin(), $join->getAlias(), $join->getConditionType(), $join->getCondition(), $join->getIndexBy());
}
$this->filterer->filter($queryBuilder, $query->getFilter(), $this->selectGenerator->getUniqueNameToSelectFieldMap($query));
$this->sorter->sort($queryBuilder, $query->getSort(), $this->selectGenerator->getUniqueNameToSelectFieldMap($query));
$this->paginator->paginate($queryBuilder, $query->getPagination(), $this->dataSource->getFields());
$this->dataSource->getEventDispatcher()->dispatch(DoctrineDriver::EVENT_POST_GENERATE_QUERY_BUILDER, new PostGenerateQueryBuilderEvent($queryBuilder, $this->getFromAlias()));
return $queryBuilder;
}
