public static void Save(IDictionary <string, object> diagram)
{
var diagramObject = new Attachment()
{
name = diagram["name"].ToString()
};
string[] userStoriesIds = diagram.ContainsKey("userStories") ?
((object[])diagram["userStories"]).Where(w => w != null).Select(s => s.ToString()).ToArray()
: null;
string graph = diagram.ContainsKey("graph") ? diagram["graph"].ToString() : null;
string svg = diagram.ContainsKey("svg") ? diagram["svg"].ToString() : null;
service.Add(diagramObject, userStoriesIds, graph, new New().GetUserId(), svg).ToString();
}