public async Task <ContentTree> CloneContentTree(string treeId, string newVersionCode)
{
// Use No Tracking since we'll be inserting a new content tree, not updating the source
var sourceTree = await _connectDb.ContentTrees
.AsNoTracking()
.Include(x => x.ContentNodes)
.FirstOrDefaultAsync(x => x.Id == treeId);
var sourceNodes = sourceTree.ContentNodes.ToList();
var nodeKeyMap = new Dictionary <string, string>();
if (sourceTree == null)
{
throw new NullReferenceException($"Could not locate a record for version id: {treeId}");
}
// Initialize the cloned tree
var clonedTree = new ContentTree
{
Id = Guid.NewGuid().ToString("N"),
ContentType = sourceTree.ContentType,
ContentId = sourceTree.ContentId,
VersionCode = newVersionCode,
ContentNodes = new List <ContentNode>()
};
// Clone the content node structure
foreach (var node in sourceNodes)
{
// Generate a new node key and track old id
var newNodeId = Guid.NewGuid().ToString("N");
nodeKeyMap.Add(node.Id, newNodeId);
node.Id = newNodeId;
// Instruct the underlying provider to clone a new content instance
var clonedWidget = _widgetProvider.CloneSettings(node.WidgetType, node.WidgetId);
// Some content types have static or null models, thus return null clones.
// This is expected behavior and should result in a null mapping value
node.WidgetId = clonedWidget?.Id;
}
// 2nd pass (efficient) to update parent Ids using the node map
foreach (var node in sourceNodes)
{
if (node.ParentId != null && nodeKeyMap.ContainsKey(node.ParentId))
{
node.ParentId = nodeKeyMap[node.ParentId];
}
}
clonedTree.ContentNodes.AddRange(sourceTree.ContentNodes);
//TODO: Wrap in transaction to ensure data integrity
_connectDb.ContentTrees.Add(clonedTree);
await _connectDb.SaveChangesAsync();
return(clonedTree);
}