This should not be a list of ids. In ```class_info```, it is calculated as
```python
        section_info = []
        for sec in cls.get_sections():
            section_info.append({
                'num_students_priority': sec.num_students(['Priority/1']),
                'num_students_interested': sec.num_students(['Interested']),
                'num_students_enrolled': sec.num_students(['Enrolled']),
                'time': ', '.join(sec.friendly_times()),
                'room': ' and '.join(sec.prettyrooms()),
            })
```