symfony - How detach relation without deleting entity in Sonata AdminBundle? -


i have 2 entities: specialisation , course. 1 specialisation has many courses, relations "onetomany" , "manytoone".

i want create specialisations , courses separately , attach many courses specialisation through multiple select. , need remove(detach) courses specialisation without deleting courses-entities. so, did such way:

->add('courses', 'sonata_type_model', [                         'multiple' => true,                         'property' => 'title',                     ])

but when remove related course select-field in specialisation-edit -page, course-object deleting db too. tried remove orphanremoval property relation, when try detach courses specialisation, nothing happens.

so, question is: how can achieve detaching child-entities parent-entity in sonataadminbundle?

i solved it!

solution: decided use save-hooks (methods prepersist , preupdate in specialisationadmin class).

the main idea - unset related courses specialisation , set came form.

but if remove courses specialisation on edit-page, not objects in specialisation object in preupdate method. , if dont courses objects, cant set specialisation null.

so, solution of problem use snapshot property courses specialisation had before submitting form , set specialisation null, , set current specialisation courses came form:

    /**      * @param specialisation $specialisation      */     public function prepersist($specialisation)     {         $this->preupdate($specialisation);     }      /**      * @param specialisation $specialisation      */     public function preupdate($specialisation)     {         if (isset($specialisation->getcourses()->snapshot)) {             foreach ($specialisation->getcourses()->getsnapshot() $course) {                 $course->setspecialisation(null);             }         }         foreach ($specialisation->getcourses() $course) {             $course->setspecialisation($specialisation);         }     }

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