TL;DR When using custom primary keys in Laravel with Eloquent, the GetKeyName() function can return the actual value of the field for a specific record, rather than just the column name, leading to unexpected behavior if not used correctly. Custom Primary Keys in Laravel: Taming Eloquent's GetKeyName() As a Fullstack Developer, you're likely familiar with the joys of working with Laravel's Eloquent ORM. One of its most powerful features is the ability to define custom primary keys for your models. But have you ever encountered a situation where you wanted to retrieve or set this custom key dynamically? That's where GetKeyName() comes in – but, as we'll see, it can be a bit finicky with custom primary keys.