public async Task SetParentAsync(TEntity entity, IMaterializedPathEntity <TId>?parent)
{
AssertIsStoredEntity(entity);
if (parent is not null)
{
AssertIsStoredEntity(parent !);
}
var path = ParsePath(parent?.Path);
if (parent is not null)
{
path.Add(parent.Id);
}
var oldPath = entity.Path;
var newPath = FormatPath(path);
foreach (var descendant in await QueryDescendants(entity).ToListAsync())
{
var newDescendantPath = ParsePath(descendant.Path.Replace(oldPath, newPath));
descendant.Path = FormatPath(newDescendantPath);
descendant.Level = newDescendantPath.Count;
}
entity.Level = path.Count;
entity.Path = newPath;
entity.ParentId = parent?.Id;
await dbContext.SaveChangesAsync();
}
private static void AssertIsStoredEntity(IMaterializedPathEntity <TId> entity)
{
if (entity == null)
{
throw new ArgumentNullException(nameof(entity));
}
if (entity.Id.Equals(default(TId)))
{
throw new InvalidOperationException($"{nameof(entity)} does not have valid Id. Save this entity first.");
}
}
