/**
* [[@doctodo method_description:extractValue]].
*
* @param [[@doctodo param_type:caller]] $caller [[@doctodo param_description:caller]]
* @param [[@doctodo param_type:foreignModel]] $foreignModel [[@doctodo param_description:foreignModel]] [optional]
* @param [[@doctodo param_type:localModel]] $localModel [[@doctodo param_description:localModel]] [optional]
*
* @return [[@doctodo return_type:extractValue]] [[@doctodo return_description:extractValue]]
*/
public function extractValue($caller, $foreignModel = null, $localModel = null)
{
if (is_null($foreignModel)) {
$foreignModel = $this->foreignModel;
}
$foreignField = $this->foreignField;
$value = null;
if (isset($this->value)) {
if (is_callable($this->value)) {
$value = call_user_func($this->value, $foreignModel, $this);
} else {
$value = $this->value;
}
} elseif (isset($foreignField)) {
if (is_callable($foreignField)) {
$value = call_user_func($foreignField, $foreignModel);
} elseif (!is_object($foreignField) && is_array($foreignField)) {
$value = $caller->buildLocalAttributes($foreignModel, $localModel, $caller->buildMap($foreignField));
} elseif (is_string($foreignField)) {
$value = isset($foreignModel->{$foreignField}) ? $foreignModel->{$foreignField} : null;
}
}
if (is_object($value) && $value instanceof DataItem) {
$object = $value->handle();
if ($object) {
$value = $object->primaryKey;
} else {
$value = null;
}
}
if (!is_array($value)) {
if (isset($this->filter)) {
$value = call_user_func($this->filter, $value);
}
$value = $this->dataSource->universalFilter($value);
}
return $value;
}
