Self JOIN query with Symfony entity -

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here's table :

enter image description here

my category entity (without getter/setter):

    /**  * @var int  *  * @orm\column(name="id", type="integer")  * @orm\id  * @orm\generatedvalue(strategy="auto")  */ private $id;  /**  * @var string  *  * @orm\column(name="name", type="string", length=255)  */ private $name;  /**  * @var string  *  * @orm\column(name="slug", type="string", length=255, nullable=true)  */ private $slug;  /**  * @var int  * @gedmo\treeleft  * @orm\column(name="lft", type="integer")  */ private $lft;  /**  * @var int  * @gedmo\treelevel  * @orm\column(name="lvl", type="integer")  */ private $lvl;  /**  * @var int  * @gedmo\treeright  * @orm\column(name="rgt", type="integer")  */ private $rgt;  /**  * @gedmo\treeroot  * @orm\manytoone(targetentity="category")  * @orm\joincolumn(name="root", referencedcolumnname="id", ondelete="cascade")  */ private $root;  /**  * @gedmo\treeparent  * @orm\manytoone(targetentity="category", inversedby="children")  * @orm\joincolumn(name="parent", referencedcolumnname="id", ondelete="cascade")  */ private $parent;  /**  * @orm\onetomany(targetentity="category", mappedby="parent")  * @orm\orderby({"lft" = "asc"})  */ private $children;

in controller, if : 

    $category= $this->container->get('app.category.manager')->getcategorybyslug($category_slug);     $root = $term->getroot();

doctrine execute 2 queries, 1 category itself, , 1 root of category. create own repository function join 2 entities in 1 query. i've tried many things query builder, i'm completly lost.

first, create custom repository class entity.

then, paste method following into:

class categoryrepository extends entityrepository {     public function getrootbycategoryslug($slug)     {         return $this->getentitymanager()             ->createquerybuilder()             ->from('yourbundle:category', 'c')             ->where('c.slug = :slug')             ->setparameter('slug', $slug)             ->leftjoin('c.root', 'r') // join association             ->select('r') // fetch association             ->getquery()             ->getresult()        ;     } }

and use follows:

$repo = $this->getdoctrine()->getmanager()->getrepository('yourbundle:category'); $rootcategory = $repo->getrootbycategoryslug('your_slug');

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