human
Solve the following python programming problem given the following code:
@ override_settings (MIGRATION_MODULES = { 
    'migrations' : 'migrations.test_migrations_squashed_complex', 
}) 
def test_loading_squashed_complex(self) : 
    'Tests loading a complex set of squashed migrations' 
    loader = MigrationLoader (connection) 
    recorder = MigrationRecorder (connection) 
    self.addCleanup (self.flush) 
    def num_nodes() : 
        plan = set (loader.graph.forwards_plan (('migrations', '7_auto'))) 
        return len ((plan - loader.applied_migrations)) 
loader.build_graph () 
    self.assertEqual (num_nodes (), 5) 
    recorder.record_applied ('migrations', '1_auto') 
    loader.build_graph () 
    self.assertEqual (num_nodes (), 4) 
    recorder.record_applied ('migrations', '2_auto') 
    loader.build_graph () 
    self.assertEqual (num_nodes (), 3) 
    recorder.record_applied ('migrations', '3_auto') 
    loader.build_graph () 
    self.assertEqual (num_nodes (), 4) 
    recorder.record_applied ('migrations', '4_auto') 
    loader.build_graph () 
    self.assertEqual (num_nodes (), 3) 
    recorder.record_applied ('migrations', '5_auto') 
    loader.build_graph () 
    self.assertEqual (num_nodes (), 2) 
    recorder.record_applied ('migrations', '6_auto') 
    loader.build_graph () 
    self.assertEqual (num_nodes (), 1) 
    recorder.record_applied ('migrations', '7_auto') 
    loader.build_graph () 
    self.assertEqual (num_nodes (), 0) 

    
    

    Fix the buggy line: self.addCleanup (self.flush)
assistant
#Here is Python code to fix the buggy line: self.

self.addCleanup (recorder.flush)