in symfony we can access many-to-many relations with getter functions which return objects of ArrayCollection type.
for example for getting Alex's students we can call $alex->getStudens()
, then i have access to ale's studens object.
now my question is how i can access alex's students id's in array, for example by calling $alex->getStudentsIds()
it returns {1,5,7,12,..} , which are his students's ids.
precisely how you wrote it, you add another function in the entity
public function getStudentsIds()
{
$students = $this->students;
$studentIds = [];
foreach($students as $student)
{
$studentIds[] = $student->getId();
}
return $studentIds;
}
Ideal solution would be to add such a method to a repository and have it query only for student ids for given object but this is the simpliest solution possible.