/** {@inheritDoc} */
public function compute(AbstractSnapshot $old, AbstractSnapshot $new)
{
if (null !== $this->changes) {
return;
}
$this->changes = [];
foreach (array_unique(array_merge(array_keys($old->getComparableData()), array_keys($new->getComparableData()))) as $key) {
$result = $this->computeEntry($old, $new, $key);
if (null !== $result) {
$this->changes[$key] = $result;
}
}
/*
* Collection tricky case : each changes should not be represented by
* its primary key, but by a numeric key. Because it is a collection, duh.
*/
if ($old instanceof CollectionSnapshot && $new instanceof CollectionSnapshot) {
$this->changes = array_values($this->changes);
}
}
