DQL Request with LeftJoin - symfony

Question

I want to count how many times my theme is used in my Blog.
Any blog posts (articles in french) can use one or more theme.
So I have a table (ManyToMany) :
themes_articles (id_theme,id_article) And :
theme (id_theme,nom_theme)
articles (blog posts) (id_article, description ...)
In SQL, I do :
SELECT T.id,nom_theme,count(A.themes_id) from themes_articles A right join themes T on T.id=A.themes_id group by nom_theme
It works, but when I want to use right join in DQL, it's a little bit hard. I switched my two tables for use a left join but I don't know how I can use my relation table here (themes_articles).
I tried something like this :
$query = $this->createQueryBuilder('')
->select(array('T.id', 'nomTheme', 'count(A.themes_id) as nombre'))
->from('themes', 'T')
->leftJoin('themes_articles', 'A', 'WITH', 'T.id= A.themes_id')
->groupBy('nom_theme');
return $query->getQuery()->getResult();
But it doesn't work.
[Semantical Error] line 0, col 93 near 'themes_articles': Error: Class 'themes_articles' is not defined.
How can I do to convert my SQL request in DQL request ?
Thank you a lot for any help.

Answer 1

Use like this
$query = $this->createQueryBuilder()
->select(array('t.id', 't.nomTheme', 'count(ta.themes_id) as nombre'))
->from('<YOUR BUNDLE>:<Theam Entity Class>', 't') //Like AcmeTheamBundle:Themes
->leftJoin('t.themes_articles')
->groupBy('t.nomTheme'); //better to use theam id
return $query->getQuery()->getResult();

Answer 2

It is a little bit better ! I had to add the name of the relation between Articles and themes (contient) in my request.
$query = $this->createQueryBuilder('t')
->select(array('t.id', 't.nomTheme', 'count(ta.id) as nombre'))
->leftJoin('t.contient', 'ta', 'WITH', 't.id= ta.id')
->groupBy('t.nomTheme'); //better to use theam id
return $query->getQuery()->getResult();