human
Solve the following python programming problem given the following code:
@ mock.patch ('boto3.resources.action.create_request_parameters') 
def test_batch_action_calls_operation(self, crp_mock) : 
    def side_effect(resource, model, params = None, index = None) : 
        params ['foo'] = 'bar' 
crp_mock.side_effect = side_effect 
    client = mock.Mock () 
    item = mock.Mock () 
    item.meta = ResourceMeta ('test', client = client) 
    collection = mock.Mock () 
    collection.pages.return_value = [[crp_mock]] 
    model = self.model 
    action = BatchAction (model) 
    action (collection) 
    crp_mock.assert_called_with (item, model.request, params = { 
        'foo' : 'bar', 
}, index = 0) 
    client.get_frobs.assert_called_with (foo = 'bar') 

    
    

    Fix the buggy line: collection.pages.return_value = [[crp_mock]]
assistant
#Here is Python code to fix the buggy line: collection.

collection.pages.return_value = [[item]]