How to create a parent-child inner hit query with elasticsearchDSL Builder - php

Question

Using the ONGR/ElasticsearchDSL I'm trying to add a Parent child inner hit query. The example documentation indicates that the proper way to do this is to
{
"inner_hits" : {
"children" : {
"type" : {
"article" : {
"query" : {
"match" : {"title" : "[actual query]"}
}
}
}
}
}
}
And now the query via DSL:
$matchQuery = new MatchQuery('title', '[actual query]');
$innerHit = new ParentInnerHit('children', 'article', $matchQuery);
$search = new Search();
$search->addInnerHit($innerHit);
$search->toArray();
So for my scenario I did:
$termQuery = new TermQuery('user', $query);
$innerHit = new ParentInnerHit('child_type', 'parent_type', $termQuery);
$search->addInnerHit($innerHit);
My problem is that I'm getting the error message:
Catchable fatal error: Argument 3 passed to
ONGR\ElasticsearchDSL\InerHit\NestedInnerHit::__construct()
must be an instance of ONGR\ElasticsearchDSL\Search,
instance of ONGR\ElasticsearchDSL\Query\TermLevel\TermQuery
give defined in ../ongr/elasticsearch-dsl/src/InnerHit/NestedInnerHit.php
on line 46
Any thoughts or suggestions?

Answer 1

As you can see from exception ParentInnerHit is expecting Search instead of Query, which makes sense. To build desired query you have to:
$termQuery = new TermQuery('user', $query);
$searchObject = new Search();
$search->addQuery($termQuery);
$innerHit = new ParentInnerHit('child_type', 'parent_type', $searchObject);
$search->addInnerHit($innerHit);
Did not test this, but you should get the idea.