human
Solve the following python programming problem given the following code:
def _test_resource_serialization(self, session_method, resource_method) : 
    attr_type = resource.Resource 
    class Test (resource.Resource) : 
        allow_create = True 
        attr = resource.prop ('attr', type = attr_type) 
the_id = 123 
    sot = Test () 
    sot.attr = resource.Resource ({ 
        'id' : the_id, 
}) 
    self.assertEqual (attr_type, type (sot.attr)) 
    def fake_call(* args, **kwargs) : 
        attrs = kwargs ['json'] 
        try : 
            json.dumps (attrs) 
except TypeError as e : 
            self.fail (('Unable to serialize _attrs: %s' % e)) 
resp = mock.Mock () 
        resp.json = mock.Mock (return_value = attrs) 
        return resp 
session = mock.Mock () 
    setattr (session, session_method, mock.Mock (side_effect = fake_call)) 
    if (resource_method == 'create_by_id') : 
        session.create_by_id (session, sot._attrs) 
else : 
        if (resource_method == 'update_by_id') : 
            session.update_by_id (session, None, resource_method._attrs) 

    
    

    Fix the buggy line: session.update_by_id (session, None, resource_method._attrs)
assistant
#Here is Python code to fix the buggy line: session.

session.update_by_id (session, None, sot._attrs)