What is inversedBy and mappedBy for in Doctrine and what is the difference?

Question

Doctrine ORM

Hello.
I just can’t catch the difference between these parameters and why they are set when creating relationships between objects.
Someone please explain. Thank you!

Answer 1

For declaring two-way relationships between entities. In fairness - in 99% of cases, two-way communications are not needed and are best avoided if possible. At least because they are not needed and allow you to do terrible things, well, this has a detrimental effect on performance.