Added connect(), document data now stored as Python

Added document length, contains, etc with tests

mongomap/__init__.py

@@ -3,7 +3,38 @@ from document import *
 import fields
 from fields import *
 
-__all__ = document.__all__ + fields.__all__
+from pymongo import Connection
+
+__all__ = document.__all__ + fields.__all__ + ['connect']
 
 __author__ = 'Harry Marr'
 __version__ = '0.1'
+
+_connection_settings = {
+    'host': 'localhost',
+    'port': 27017,
+    'pool_size': 1,
+}
+_connection = None
+_db = None
+
+def _get_connection():
+    if _connection is None:
+        _connection = Connection(**_connection_settings)
+    return _connection
+
+def connect(db=None, username=None, password=None, **kwargs):
+    """Connect to the database specified by the 'db' argument. Connection 
+    settings may be provided here as well if the database is not running on
+    the default port on localhost. If authentication is needed, provide
+    username and password arguments as well.
+    """
+    if db is None:
+        raise TypeError('"db" argument must be provided to connect()')
+
+    _connection_settings.update(kwargs)
+    connection = _get_connection()
+    # Get DB from connection and auth if necessary
+    _db = connection[db]
+    if username is not None and password is not None:
+        _db.authenticate(username, password)