I have the following issue:
I have a form that has some input fields that are not required. If a user enters something, it should have for example a minimum, maximum length or match a regex. If a user does not enter something, validation should not happen on that particular field.
I have a field called postalcode that has a minimum length of 6 characters
->add('postalcode',new StringLength(array( 'min' => 6, 'messageMinimum' => 'you should enter at least 6 characters' )))
If nothing is submitted in the postalcode field the StringLength validator returns a message because nothing/NULL is less than 6, That's not want I want, because this field is not required, but if something is submitted it should have a minimum of 6 characters.
My question: Is there something available to solve this issue, or should I write a new validation class?