private async Task EnsureNewParentIsNotChild(Guid topicToUpdateId, Guid newParent)
{
var tree = await _getTopicTreeOperation.Execute();
GetTopicTreeOperationResponse.Topic topicToUpdate = null;
foreach (var treeRoot in tree.Roots)
{
topicToUpdate = treeRoot
.FindAnyOrDefault(
root => root.Children,
topic => topic.Id == topicToUpdateId);
if (topicToUpdate != null)
{
break;
}
}
bool newParentIsChild = topicToUpdate.FindAnyOrDefault(
root => root.Children,
topic => topic.Id == newParent) != null;
if (newParentIsChild)
{
throw new ApplicationException("Cannot assign a child topic as a parent.");
}
}
public async Task <IActionResult> TopicTree()
{
var response = await _getTopicTreeOperation.Execute();
var model = new TopicTreeModel(response);
return(Ok(model));
}