/**
* Add a validation rule to ensure that a field is an array containing at most
* the specified amount of elements
*
* @param string $field The field you want to apply the rule to.
* @param int $count The number maximum amount of elements the field should have
* @param string|null $message The error message when the rule fails.
* @param string|callable|null $when Either 'create' or 'update' or a callable that returns
* true when the validation rule should be applied.
* @see \Cake\Validation\Validation::numElements()
* @return $this
*/
public function hasAtMost($field, $count, $message = null, $when = null)
{
$extra = array_filter(['on' => $when, 'message' => $message]);
return $this->add($field, 'hasAtMost', $extra + ['rule' => function ($value) use($count) {
if (is_array($value) && isset($value['_ids'])) {
$value = $value['_ids'];
}
return Validation::numElements($value, '<=', $count);
}]);
}
/**
* Test numElements
*
* @return void
*/
public function testNumElements()
{
$array = ['cake', 'php'];
$this->assertTrue(Validation::numElements($array, '==', 2));
$this->assertFalse(Validation::numElements($array, '>', 3));
$this->assertFalse(Validation::numElements($array, '<', 1));
$callable = function () {
return '';
};
$this->assertFalse(Validation::numElements(null, '==', 0));
$this->assertFalse(Validation::numElements(new \stdClass(), '==', 0));
$this->assertFalse(Validation::numElements($callable, '==', 0));
$this->assertFalse(Validation::numElements(false, '==', 0));
$this->assertFalse(Validation::numElements(true, '==', 0));
}
