/**
* Get the callback that will be used for the given FieldInterface object.
*
* @param FieldInterface $field
* @throws \Dewdrop\Fields\Exception\HelperCallableNotAvailableForField
* @return callable
*/
public function getFieldAssignment(FieldInterface $field)
{
if (!$this->hasValidName()) {
return false;
}
$id = $field->getId();
if (!array_key_exists($id, $this->assignments)) {
if (!$field->hasHelperCallback($this->name)) {
$callback = $this->detectCallableForField($field);
} else {
$callback = $field->getHelperCallback($this->name);
}
if (!is_callable($callback)) {
throw new HelperCallableNotAvailableForField("Field {$id} does not have a callable assigned and one could not be detected.");
}
$this->assignments[$id] = $this->wrapCallable($callback);
}
return $this->assignments[$id];
}
