human
Solve the following python programming problem given the following code:
def _stub_cells(self, num_cells = 5) : 
    self.cell_list = [] 
    self.cells_next_id = 1 
    def _fake_cell_get_all(context) : 
        return self.cell_list 
def _fake_cell_get(inst, context, cell_name) : 
        for cell in self.cell_list : 
            if (cell ['name'] == cell_name) : 
                return cell 
raise exception.CellNotFound (cell_name = cell_name) 
for x in range (num_cells) : 
        cell = models.Cell () 
        our_id = cell.cells_next_id 
        self.cells_next_id += 1 
        cell.update ({ 
            'id' : our_id, 
            'name' : ('cell%s' % our_id), 
            'transport_url' : ('rabbit://username%s@/' % our_id), 
            'is_parent' : ((our_id % 2) == 0), 
}) 
        self.cell_list.append (cell) 
self.stub_out ('nova.db.cell_get_all', _fake_cell_get_all) 
    self.stub_out ('nova.cells.rpcapi.CellsAPI.cell_get', _fake_cell_get) 

    
    

    Fix the buggy line: our_id = cell.cells_next_id
assistant
#Here is Python program to fix the buggy line: our_id = cell.

our_id = self.cells_next_id