/**
* Add an field to the model. If a field with the same name has already been added,
* it will be replaced by the given field.
*
* @param Opus_Model_Field $field Field instance that gets appended to the models field collection.
* @return Opus_Model_Abstract Provide fluent interface.
*/
public function addField(Opus_Model_Field $field)
{
$fieldname = $field->getName();
if (isset($fieldname, $this->_externalFields[$fieldname])) {
$options = $this->_externalFields[$fieldname];
// set ValueModelClass if a through option is given
if (isset($options['model'])) {
$field->setValueModelClass($options['model']);
}
// set LinkModelClass if a through option is given
if (isset($options['through'])) {
$field->setLinkModelClass($options['through']);
}
// set SortOrderField, if a "sort_field" option is given.
if (isset($options['sort_field'])) {
$field->setSortFieldName($options['sort_field']);
}
}
return parent::addField($field);
}