Data Validation: Checking if at least one field is populated and multiple rules not validating

Folks,

I'm trying to ensure at least one of two fields (last_name or email) is being populated. Each field also has multiple rules. I'm using CakePHP version 2.4.2. 

The problem I have at the moment, after multiple permutations of updating and/or moving around the use 'last', 'allowEmpty', 'required', etc, is that the fields just aren't validating at all, or aren't executing all the rules when a field is populated.

Any advice on how to modify the code below to achieve the following behaviour is much appreciated:

1. One of the two fields must be populated;

2. The other rules attached to each field must validate as well (i.e. if a last name is passed, then it must be between 2 and 45 chars and alphanumeric only)

Here's the model code:

public $validate = array(

'last_name'=> array(

'needOne' => array (

'required' => FALSE,

'allowEmpty' => TRUE,

'last' => TRUE,

'rule' => array('checkOne','last_name'),

'message' => 'You must enter at least a contact name or email address.'

),

'alphaNumeric' => array(

'rule' => 'alphaNumeric',

'message'  => 'Alphabets and numbers only'

),

'between' => array(

'rule' => array('between', 2, 45),

'message' => 'Between 2 to 45 characters'

)

),

'email' => array(

'needOne' => array (

'required' => FALSE,

'allowEmpty' => TRUE,

'last' => TRUE,

'rule' => array('checkOne','email'),

'message' => 'You must enter at least a contact name or email address.'

),

'emailAddress' => array (

'last' => TRUE,

'rule' => array('email', FALSE),

'message'  => 'A valid Email address is required'

)

)

);

// Ensure at least the last name or email field value is provided

function checkOne() {

if(!empty($this->data[$this->User]['last_name']) || 

!empty($this->data[$this->User]['email'])){

return true;

} else {

return false;

}

}

Thanks in advance!

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