private IMongoCollection <MongoContentItem> GetMongoCollection(string type, bool published = false)
        {
            string name = $"ContentItems_{type}";

            if (published)
            {
                name += "_Published";
            }

            if (ContentItems.TryGetValue(name, out IMongoCollection <MongoContentItem>?items) == false)
            {
                items = OfmlDb.GetCollection <MongoContentItem>(name);

                ContentItems.Add(name, items);
            }

            return(items);
        }