/**
* Ensures there is a choices array set.
*
* @param array $options
*/
public function __construct($options = array())
{
parent::__construct($options);
if (empty($this->choices)) {
// Ensure we have choices to gather values from
throw new Kohana_Exception(':class must have a `choices` property set', array(':class' => get_class($this)));
}
if (in_array(NULL, $this->choices)) {
// Set allow_null to TRUE if we find a NULL value
$this->allow_null = TRUE;
} elseif ($this->allow_null) {
// We're allowing NULLs but the value isn't set. Create it so validation won't fail.
array_unshift($this->choices, NULL);
}
// Select the first choice
reset($this->choices);
if (!Arr::is_assoc($this->choices)) {
// Convert non-associative values to associative ones
$this->choices = array_combine($this->choices, $this->choices);
}
if (!array_key_exists('default', $options)) {
// Set the default value from the first choice in the array
$this->default = key($this->choices);
if ($this->choices[$this->default] === NULL) {
// Set the default to NULL instead of using the key which is an empty string for NULL values
$this->default = NULL;
}
}
// Add a rule to validate that the value is proper
$this->rules[] = array('array_key_exists', array(':value', $this->choices));
}
