Retrieve a list of matching objects from a range of ids in Django

Question

I want to achieve something relatively simple: I want to retrieve all objects from my model given a range of ids (for eg, retrieve the lines 5 to 10 from a book\'s chapter).

Answer 1

I think you want __range:

Range test (inclusive).

Example:

start_date = datetime.date(2005, 1, 1)
end_date = datetime.date(2005, 3, 31)
Entry.objects.filter(pub_date__range=(start_date, end_date))

SQL equivalent:

SELECT ... WHERE pub_date BETWEEN '2005-01-01' and '2005-03-31';

You can use range anywhere you can use BETWEEN in SQL — for dates, numbers and even characters.

So yours would be, I think:

chapter_lines = get_list_or_404(..., line__range=(int(line_start), int(line_end)+1))

Likewise, you can use __lt, __gt, __lte, __gte for one-sided comparisons.

I would encourage you to always keep a window open with the Django documentation. There is lots of great info there if you just look.