Using complex conditional validation rule in FormRequest in Laravel - laravel

Question

I am developing a Web application using Laravel. What I am doing now is creating a FirmRequest for the validation.
This is my FormRequest.
use Illuminate\Foundation\Http\FormRequest;
class StoreVacancy extends FormRequest
{
public function authorize()
{
return true;
}
public function rules()
{
return [
'title' => 'required',
'type' => 'required',
'complex_field' => ...need complex conditional validation based on the type field
];
}
}
If I did not use the FormRequest, I can create validator in the controller and set complex conditional validation rule like this.
$v = Validator::make($data, [
//fields and rules
]);
$v->sometimes('reason', 'required|max:500', function ($input) {
return $input->games >= 100;
});
But the issue is that I am not creating the Validator in the controller. But I am using the FormRequest. How can I achieve the same thing in the FormRequest?

Answer 1

You can manually adjust the rules depending on the input data:
class StoreVacancy extends FormRequest
{
public function rules()
{
$reason = $this->request->get('reason'); // Get the input value
$rules = [
'title' => 'required',
'type' => 'required',
];
// Check condition to apply proper rules
if ($reason >= 100) {
$rules['complex_field'] = 'required|max:500';
}
return $rules;
}
}
Its not the same as sometimes, but it does the same job.

Answer 2

Since 5.4 you can use the method "withValidator" inside your FormRequest:
https://laravel.com/docs/5.4/validation
This method receives the fully constructed validator, allowing you to call any of its methods before the validation rules are actually evaluated
use Illuminate\Foundation\Http\FormRequest;
class StoreVacancy extends FormRequest
{
public function authorize()
{
return true;
}
public function rules()
{
return [
'title' => 'required',
'type' => 'required',
];
}
public function withValidator($validator)
{
$validator->sometimes('reason', 'required|max:500', function ($input) {
return $input->games >= 100;
});
}
}

Answer 3

You can check the createDefaultValidator function in https://github.com/laravel/framework/blob/5.7/src/Illuminate/Foundation/Http/FormRequest.php. We will override that function and add our condition
/**
* Add Complex Conditional Validation to the validator instance.
*
* #param \Illuminate\Validation\Factory $factory
* #return \Illuminate\Validation\Validator
*/
public function validator($factory)
{
$validator = $factory->make(
$this->validationData(),
$this->container->call([$this, 'rules']),
$this->messages(),
$this->attributes()
);
$validator->sometimes('reason', 'required|max:500', function ($input) {
return $input->games >= 100;
});
return $validator;
}