human
Solve the following python programming problem given the following code:
def getConnectionByKey(self, connection_key) : 
    def gotResult(connections) : 
        if (len (connections) == 0) : 
            return defer.fail (error.ConnectionNonExistentError (('No connection with key %s' % connection_key))) 
conn = connections [0] 
        return self.getConnection (conn.connection_id) 
d = database.ServiceConnection.findBy (id = d) 
    d.addCallback (gotResult) 
    return d 

    
    

    Fix the buggy line: d = database.ServiceConnection.findBy (id = d)
assistant
#Here is Python program to fix the buggy line: d = database.

d = database.ServiceConnection.findBy (id = connection_key)