Access Laravel Route Model Binding Values in Form Requests

Here's an example form request to update a user's profile:

class ProfileUpdateRequest extends FormRequest
{
    //...

    public function rules(): array
    {
        return [
            'email' => ['required', 'email', Rule::unique('users', 'email')],
        ];
    }
}

Let's imagine this request was sent down with a route that looks like this:

Route::patch('/users/{user}', ProfileUpdateController::class);

How do we access the route model binding value for user in our form request class?

Simple, since a form request is an extension of a Laravel Request, here's how:

class ProfileUpdateRequest extends FormRequest
{
    //...

    public function rules(): array
    {
        return [
            'email' => [
                'required',
                'email',
                Rule::unique('users', 'email')->ignore($this->user->id)
            ],
        ];
    }
}

We can now ignore the user's current email in the unique check by accessing $this->user, which gives us back the entire resolved User model.