PhpStorm is unable to autocomplete only in models, it also fails to autocomplete built-in php functions, but when a model extends Eloquent instead of Model the autocomplete works correct and also when i generate phpdocs for the models using the comman php artisan ide-helper:models it works.
without ide-helper:models and extends Model

with ide-helper:models

I am using Laravel 5.4.30
see #541 , hopefully it'll get fixed soon. It's kinda annoying.
https://github.com/barryvdh/laravel-ide-helper/issues/541#issuecomment-317411918
this includes issue with PhpStorm not handling dynamic method calls via __callStatic on a non-static method
This is a duplicate of the linked issue.
this update would make automate the adding of the mixin via the ide-helper commands...
https://github.com/barryvdh/laravel-ide-helper/pull/544
@barryvdh this is another issue fixed with the @mixin and can be closed :}
Most helpful comment
see #541 , hopefully it'll get fixed soon. It's kinda annoying.