human
Solve the following python programming problem given the following code:
@ pytest.fixture (autouse = True) 
def database_session(request, monkeypatch) : 
    '
    Prepare the SQLAlchemy session object.

    We enable fast repeatable database tests by setting up the database only
    once per session (see :func:`setup_database`) and then wrapping each test
    function in a SAVEPOINT/ROLLBACK TO SAVEPOINT within the transaction.
    ' 
    db.Session.begin_nested () 
    request.addfinalizer (db.Session.rollback) 
    def _fake_commit() : 
        db.Session.flush () 
        db.Session.expire_all () 
monkeypatch.setattr (db.Session, 'commit', request) 
    monkeypatch.setattr (db.Session, 'remove', (lambda : None)) 

    
    

    Fix the buggy line: monkeypatch.setattr (db.Session, 'commit', request)
assistant
#Here is Python program to fix the buggy line: monkeypatch.

monkeypatch.setattr (db.Session, 'commit', def _fake_commit()