Conditional validation on Custom form request - php

Question

on my controller I have:
public function store(ProductRequest $request)
The request:
class ProductRequest extends Request
{
public function rules()
{
return [
'name' => 'required|min:3',
'perTypeTime' => 'sometimes|required',
'per_type_id' => 'required'
];
}
}
I want to change the perTypeTime rule above to be conditional depending on if per_type_id field == 1.
If I initiated the validator in the controller I believe I could do something like the below:
$v = Validator::make($data, [
'per_type_id' => 'required|email'
]);
$v->sometimes('perTypeTime', 'required|max:500', function($input)
{
return $input->per_type_id == 1;
});
Is there a way to do this, while keeping my custom request. I like how this approach keeps the controller cleaner.
I can't seem to access the validator on the request object. Is there a way to specify this condition inside the request itself, or to access the validator from the request object, or is there another way?

Answer 1

You can do that
I want to change the perTypeTime rule above to be conditional depending on if per_type_id field == 1.
within your rules() method in your ProductRequest.
For details see required_if:anotherfield,value in the Laravel documentation validation rules.
public function rules()
{
return [
'name' => 'required|min:3',
'perTypeTime' => 'required_if:per_type_id,1',
'per_type_id' => 'required'
];
}

Answer 2

Laravel 5.3, in your request file you can add:
use Illuminate\Validation\Factory;
...
public function validator(Factory $factory)
{
$validator = $factory->make($this->input(), $this->rules());
$validator->sometimes('your_sometimes_field', 'your_validation_rule', function($input) {
return $input->your_sometimes_field !== null;
});
return $validator;
}

Answer 3

Actually this answer https://stackoverflow.com/a/41842050/3922975 is not the best.
We don't have to replace default validator with our own (because we are not changing anything). In that solution we hope validation factory will always require only two attributes ($this->input(), $this->rules()) which is actually not true even in time of writing.
This is a default validator used by Laravel:
$factory->make(
$this->validationData(),
$this->container->call([$this, 'rules']),
$this->messages(),
$this->attributes()
);
As you can see it is much different from that Artem Verbo used.
Better solution is to create withValidator method in your ProductRequest class:
use Illuminate\Contracts\Validation\Validator;
...
public function withValidator(Validator $validator)
{
$validator->sometimes('your_sometimes_field', 'your_validation_rule', function ($input) {
return $input->your_sometimes_field !== null;
});
}