TrackedObject::prepareUpdateEventDataForField

protected function prepareUpdateEventDataForField(string $fieldName): array
{
	if ($this->isDependantField($fieldName))
	{
		$actualCollection = $this->normalizeCollection($this->getActualValue($fieldName));
		$currentCollection = $this->normalizeCollection($this->getCurrentValue($fieldName));

		return $this->prepareUpdateEventDataForDependantField($fieldName, $actualCollection, $currentCollection);
	}

	if ($this->isChanged($fieldName))
	{
		return [
			$this->prepareDefaultUpdateEventData($fieldName)
		];
	}

	return [];
}