Validation rule to NOT ALLOW whitespace in string

Need Help
1

Hi everybody, does anybody knows if there is a validation rule which does not allow a whitespace in a string in a field?

Thank you very much!

2

There isn’t one, but you can create a custom check

https://book.cakephp.org/4/en/orm/validation.html#creating-custom-re-usable-rules

3

Thnak you for your hint. Nevertheless, I absolutely do not understand what’s written here:

Screenshot_20230826_201605
Screenshot_20230826_201605870×206 23.7 KB

Please can anybody recommend me where can I find explained examples how to build my rule? Please can anyone explain me the example from cookbook?

Thnak you!

4

There’s examples of four ways to build your own rules here.

5

Here is a simple example. Note the validation name is called positiveNumber. You can easily do a preg-match for white-spaces here.

// in Model/Table/UsersTable.php
$validator->add( 'age', 'custom', [
	'rule' => [$this, 'positiveNumber'],
	'message' => 'Number cannot be negative.'
]);

public function positiveNumber($value,$context): bool
{
  if( $value < 0 ) return false;
  return true;
}
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