How to use nested queries with FOQElasticaBundle for Symfony2 - symfony

Question

I have a problem with query building with FOQElasticaBundle
I have 3 entities
User
Hotel
Ambiance
Users can have 1 or more Hotels, and each Hotel has only 1 Ambiance.
In my config file, I have:
foq_elastica:
clients:
default: { host: %elasticsearch.host%, port: %elasticsearch.port% }
indexes:
MyBundle:
client: default
finder:
types:
user:
mappings:
id:
boost: 10
analyzer: fr_case_analyzer
name:
boost: 5
analyzer: fr_case_analyzer
hotels:
type: "nested"
properties:
name:
boost: 10
analyzer: fr_case_analyzer
ambiance:
boost: 1
I want to be able to search for User by typing his name or the name of his hotels, and possibly add a filter on the Ambiance type.
So the query should look like something like this :
$mainQuery = new \Elastica_Query_Bool();
$nameQuery = new \Elastica_Query_Bool();
$filtersQuery = new \Elastica_Query_Bool();
//searching in Users' names
$nameQuery = new \Elastica_Query_Text();
$nameQuery->setFieldQuery('name', $searchName);
$nameQuery->setFieldParam('name', 'boost', 5);
$nameQuery->setFieldParam('name', 'type', 'phrase_prefix');
//searching in Hotels' names
$hotelNameQuery = new \Elastica_Query_Text();
$hotelNameQuery->setFieldQuery('name', $searchName);
$hotelNameQuery->setFieldParam('name', 'boost', 3);
$hotelNameQuery->setFieldParam('name', 'type', 'phrase_prefix');
$nestedHotelNameQuery = new \Elastica_Query_Nested();
$nestedHotelNameQuery->setPath('hotels');
$nestedHotelNameQuery->setQuery($hotelNameQuery);
$nameQuery->addShould($nameQuery);
$nameQuery->addShould($nestedHotelNameQuery);
//if filter on ambiance
$ambianceQuery = new \Elastica_Query_Term();
$ambianceQuery->setTerm('ambiance', $arrFilters['ambiance']);
$nestedAmbianceQuery = new \Elastica_Query_Nested();
$nestedAmbianceQuery->setPath('hotels');
$nestedAmbianceQuery->setQuery($ambianceQuery);
$filtersQuery->addMust($nestedAmbianceQuery);
//adding the parameters to the main query
$mainQuery->addMust($nameQuery);
$mainQuery->addMust($filtersQuery);
Unfortunately this doesn't work and returns no result if the Ambiance filter is activated, but works perfectly if I only search with the name.
What do I do wrong ?

Answer 1

I found why it wouldn't work.
The bundle actually uses __toString() on the object.
So, instead of querying on the "id" of the ambiance, I modified my html inputs so the value is the ambiance's name.

Answer 2

Here's my own version of the solution :
According to the elasticsearch documentation we should implement a structure that's smilar to the json bellow :
{
"query": {
"bool": {
"must": [
{ "match": { "title": "eggs" }},
{
"nested": {
"path": "comments",
"query": {
"bool": {
"must": [
{ "match": { "comments.name": "john" }},
{ "match": { "comments.age": 28 }}
]
}}}}
]
}}}
So to do this with symfony 2 and according to the FOSElasticaBundle bundle we will make the following code lines :
//if filter on ambiance
$ambianceQuery = new \Elastica_Query_Term();
$ambianceQuery->setTerm('ambiance', $arrFilters['ambiance']);
// We will add the the term to the query bool
$filtersQuery->addMust($ambianceQuery)
$nestedAmbianceQuery = new \Elastica_Query_Nested();
$nestedAmbianceQuery->setPath('hotels');
// we will set the result as argument in the setQuery method.
$nestedAmbianceQuery->setQuery($filtersQuery);
// And finally we add the nested query to the main query bool through addMust.
$mainQuery->addMust($nestedAmbianceQuery);
Hope that will help others.
A+

Answer 3

Just had the same Problem. This works for me:
..
$ambianceQuery->setTerm('hotels.ambiance', $arrFilters['ambiance']);
..
Coudn't find any examples on this in FOQElasticaBundle (now FOSElasticaBundle) for Symfony2 but it should end in an elasticsearch query like this one here:
http://www.elasticsearch.org/guide/reference/query-dsl/nested-query/
One can do/test raw elasticsearch queries like this:
$queryString = '{..JSON..}';
$boolQuery = new \Elastica_Query_Builder($queryString);