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 TopicTreeNode(GetTopicTreeOperationResponse.Topic topic)
{
Id = topic.Id;
Name = topic.Subject;
Children = topic.Children.Select(c => new TopicTreeNode(c)).ToList();
}
