README.md

Form Requests in Livewire

This is a simple implementation of Form Requests in Livewire.

Usage

Using this is pretty straight forward. Add the HasFormRequest trait to your component and set a protected variable named $request to your FormRequest.

class UserEdit extends Component
{
    use HasFormRequest;
  
    /**
     * @var class-string<FormRequest>
     */
    protected string $request = UserEditRequest::class;
}

Dynamic Validation

You can add additional validation rules in your Form Request depending on the value of a property in your Livewire component. This trait adds an attribute called __instance.

An example:

/** @var ?UserEdit $instance */
$instance = $this->attributes->get('__instance');

if ($instance && $instance->user->exists()) {
    // Additional rules
}

HasFormRequest.php

<?php

/** @noinspection PhpUnused */

namespace App\Http\Livewire\Traits;

use Exception;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Support\Facades\Gate;
use Livewire\Component;

/**
 * @mixin Component
 */
trait HasFormRequest
{
    /**
     * @noinspection PhpMissingReturnTypeInspection
     *
     * @throws Exception
     */
    public function mountHasFormRequest()
    {
        Gate::allowIf(fn () => $this->isAuthorized());
    }

    /**
     * @throws Exception
     */
    protected function getRequestRules(): array
    {
        $request = $this->getFormRequest();

        return method_exists($request, 'rules')
            ? $request->rules()
            : [];
    }

    /**
     * Get the messages from the form request.
     *
     * @throws Exception
     */
    protected function getRequestMessages(): array
    {
        $messages = $this->getFormRequest()->messages();

        return ! empty($messages)
            ? $messages
            : [];
    }

    /**
     * This is a near-copy of passesAuthorization on a standard
     * FormRequest. It has been adjusted for Livewire.
     *
     * @return bool
     *
     * @throws Exception
     */
    protected function isAuthorized(): bool
    {
        $request = $this->getFormRequest();

        if (method_exists($request, 'authorize')) {
            return app()->call([$request, 'authorize']);
        }

        return true;
    }

    /**
     * Get the form request from the Livewire component.
     *
     * @return FormRequest
     *
     * @throws Exception
     */
    protected function getFormRequest(): FormRequest
    {
        if (! property_exists($this, 'request')) {
            throw new Exception('Please specify a `request` parameter and set it to a FormRequest');
        }

        if (! new $this->request instanceof FormRequest) {
            throw new Exception("$this->request is not a valid `FormRequest`.");
        }

        /** @var FormRequest $request */
        $request = $this->request::createFrom(request());
        $request->attributes->set('__instance', $this);

        return $request;
    }

    /**
     * @throws Exception
     */
    protected function getRules(): array
    {
        $rules = $this->getRequestRules();

        if (! empty($rules)) {
            return $rules;
        }

        if (method_exists($this, 'rules')) {
            return $this->rules();
        }

        if (property_exists($this, 'rules')) {
            return $this->rules;
        }

        return [];
    }

    /**
     * @throws Exception
     */
    protected function getMessages(): array
    {
        $messages = $this->getRequestMessages();

        if (! empty($messages)) {
            return $messages;
        }

        if (method_exists($this, 'messages')) {
            return $this->messages();
        }

        if (property_exists($this, 'messages')) {
            return $this->messages;
        }

        return [];
    }
}

Hello ju5t, do you believe there is any way to use another resources from FormRequests like prepareForValidation?

I haven't tried it -- and we've switched to a much more dynamic implementation since then so unfortunately I can't test this anywhere at the moment. You probably could by implementing more into this trait, but I'm not sure.

Yeah, unfortunately, I tried in every possible way to integrate FormRequest features like prepareForValidation with Livewire, but I couldn't. I believe it may not even be possible. But thank you very much for your feedback.