symfony - Can't get any entity associated to a tree entity -


i'm working on e-learning application , have categorize courses. section entity 1 of tree extension. in order retrieve courses of section, made following assoication:

/**  * @orm\onetomany(targetentity="svi\formationbundle\entity\course", mappedby="section")  */ private $courses;

the problem when try courses in twig doing {% if section.courses|length > 0 %}, receive error message 

key "courses" array keys "id, titre, sommaire, slug, deactivated, lft, lvl, rgt, root, __children" not exist in sviformationbundle:formation:see_courses.html.twig @ line 22.

i made dump on section object , displayed attributes except ones of onetomany , manytoone associations. please? isn't possible associate other entities tree entity? if how make nested classification in symfony? thanks.

in query, have explicitely add 'join' or 'leftjoin' 'course' entity.


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