Node Creation Handlers need to be applied before CreateNodeAggregateWithNode is submitted

[bwaidelich]

Currently Node Creation Handlers are applied at the end of AbstractCreate::createNode() when the command has been written (and projected) already.

It is important that the creation handlers can hook into the creation process though in order to be able to enforce domain specific invariants (for example: document nodes need to have a uriPathSegment property set).

Suggestion

in AbstractCreate::createNode() change:

$command = new CreateNodeAggregateWithNode(...);

$this->nodeAggregateCommandHandler->handleCreateNodeAggregateWithNode($command)->blockUntilProjectionsAreUpToDate();

$newlyCreatedNode = $parentNode->findNamedChildNode($nodeName);
$this->applyNodeCreationHandlers($newlyCreatedNode);
    // ...

to:

$command = new CreateNodeAggregateWithNode(...);

$command = $this->applyNodeCreationHandlers($command, $nodeTypeName);

$this->nodeAggregateCommandHandler->handleCreateNodeAggregateWithNode($command)->blockUntilProjectionsAreUpToDate();

$newlyCreatedNode = $parentNode->findNamedChildNode($nodeName);
    // ...