public AddressRepository(ISimpleDatabaseSettings settings)
        {
            var client = new MongoClient(settings.ConnectionString);
            var db     = client.GetDatabase(settings.DatabaseName);

            _mongoCollection = db.GetCollection <Address>(settings.AddressCollectionName);
        }
        public BookRepository(ISimpleDatabaseSettings settings)
        {
            var client = new MongoClient(settings.ConnectionString);
            var db     = client.GetDatabase(settings.DatabaseName);

            _mongoCollection  = db.GetCollection <Book>(settings.BooksCollectionName);
            _writerCollection = db.GetCollection <Writer>(settings.WriterCollectionName);
        }