[Proposal] Validation Exception Factory

[joelharkes]

I maybe too quickly made a PR for this (see: https://github.com/laravel/framework/pull/27833/files). Let me explain the proposal.

Problem

Current issues with validation (Exception):

• You cannot translate the basic message in the http response.
• You can only change the structure of the validation error messages inside the FormRequest class. If you make dynamic rules and validate them directly it will use the default ValidationException format.

Solution

The factory method (+interface/contract for it) for the exception is feasible because everywhere the exception is thrown there is aso the IOC container that can be used to instantiate this factory.

Users of laravel framework can than extend the ValidationExceptionFactory to inject a translation for the ValidationException and can overwrite the methods to return a sublcass of ValidationException to provide additional formatting of the http response returned to the client.

[joelharkes]

I build a pr: it gets rejected telling me I should go here. I go here, nothing happens?

[ollieread]

There are a lot of ways to control this, primarily, by overriding Illuminate\Foundation\Exceptions::invalidJson(). A factory for validation exceptions isn't really the solution to this problem.