Update to `relationLoaded()` causes problems when accessing attributes on a model containing a period

[danharrin]

Laravel Version

12.10.0

PHP Version

8.3

Database Driver & Version

No response

Description

#55471 introduces a problem when attempting to access attributes on a model that contain a .. The framework calls the relationLoaded() method, which was updated to handle . as nested relationships in that PR.

Here is the link to the line that calls the method:

framework/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php

Line 485 in 3faeb07

return $this->isRelation($key) || $this->relationLoaded($key)

Here is a related test failure:
https://github.com/filamentphp/filament/actions/runs/14589554182/job/40966543141

Steps To Reproduce

https://github.com/danharrin/laravel-relation-loaded-bug-report/commit/f29cef4eab3f50bc5e359da1019a93bf10434834

[rodrigopedra]

@danharrin can you review PR #55519?

[mortalkiller]

Same issue here

[siarheipashkevich]

The same issue also