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Strange Behavior In Laravel 7.2 Illuminate\Foundation\Http\FormRequest

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I have a project with a fairly standard Dev-on-Homestead to Staging to Production workflow. All are using Laravel 7.2.2/Ubuntu 18.04/PHP 7.4.3

This cropped up today with some form requests.

Symfony\Component\ErrorHandler\Error\FatalError
Type of App\Http\Requests\CreateHighlight::$errorBag must be string (as in class Illuminate\Foundation\Http\FormRequest)

This is a named $errorBag that we've been using since 5.4 or so?

I changed the $errorBag to protected string $errorBag='highlightCreate'; and proceeded to test and deploy.

That same code kicked this back from the staging error logs:

staging.ERROR: Type of App\Http\Requests\CreateHighlight::$errorBag must not be defined (as in class Illuminate\Foundation\Http\FormRequest)

I have checked and rechecked and checked a fourth, fifth, sixth time. Everything appears to be identical between the two environments, yet I cannot for the life of me understand why this is happening. They're the same error except they're contradicting each other.

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Answer

Based on FormRequest it clearly seems like errorBag is not defined as a string. This clearly seems like it is something with your local file there is wrong. Never the less the errorBag should not be defined as a string.

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source: stackoverflow.com
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