Conditional validation

[vova07]

Hi there, first of all thanks for a great library.

I have a question about conditional validation, because my biggest problem is that the library is completely dependent on array keys.

Here is what I need:

$validator->when(function (array $values) { return isset($values['key1']); })->require('key2')->string();

I can add a new rule When which will check if one or another key is set and validate it there, but how can I require or skip a key when there is or not another key set ?

Here is how I do it atm:

$validator->optional('key')->callback(function ($value, array $values) use ($validator) {
    if (!isset($values['hey2']) || empty($values['hey2'])) {
        $validator->required('key')->string();
    }

    return true;
});

Is there a better way ?

Thanks!

[berry-langerak]

Thanks for your question. As far as I can tell, your intention is to mark a value as required if some condition is met, right? In that case, you can use conditional requiredness. In this case, you can make it required, and optional only if some condition evaluates to true:

$validator->required('key')->string()->optional(function ($values) {
   return !array_key_exists('key1', $values);
});

We didn't document this though, sorry for that. Will do so anyway :)

[vova07]

Yes, I need a required key in dependence of other keys.
For example:
I need amount to be required only if there are no price and unit or viceverca.

When I use your example I got this error:

Error: Call to undefined method Particle\Validator\Chain::optional()

The used code is really sample:

$v->required('amount')->float()->optional(function (array $values) {
    return (!isset($values['price']) || empty($values['price'])) && (!isset($values['unit']) || empty($values['unit']));
});

[vova07]

Ok .... after I read Chain class I think you made a small mistake, code should be:

$validator->optional('key')->string()->required(function (array $values) {
    return !array_key_exists('key1', $values);
});