Symfony version(s) affected

6.4.*

Description

enable_lazy_ghost_objects is causing an issue where

1. when loading an entity with and chain of relations marked EAGER, entities down the chain are not fully loaded.
2. Then on EntityManager->flush() the unset values are attempted to be written to the database

How to reproduce

Here is a reproducer: https://github.com/craigh/bug-reproducer-1

If you run the reproducer, it better explains the problem than I can do here.

also for reference: https://stackoverflow.com/questions/78267848/proxy-object-tries-to-write-unset-values-to-database?noredirect=1#comment138011312_78267848

I have an EntityA that has EAGER loaded ManyToOne relation to EntityB. EntityB also has EAGER loaded ManyToOne relation to EntityC.

I have a simple controller to edit EntityA. It loads EntityA in the action arg, e.g. public function edit(EntityA $a): Response {}.

In the controller I make a few changes to $a and then flush the entity manager. On flush I get the error

SQLSTATE[23000]: Integrity constraint violation: 1048 Column ‘first_name’ cannot be null

It appears that the proxy is not loading the relations and then on flush, attempting to write the non-loaded values back on the entity.

Possible Solution

No response

Additional Context

No response