Why is haystack throwing an error?

Question

Django

I pass the request itself to the get view with a request and from which to which line to pull out.

args['items'] = SearchQuerySet().filter(тут запрос)[from_items:to_items]

It gives the following error:
coercing to Unicode: need string or buffer, int found
Empirically, it was found out that from_items causes an error in the request, and if you replace the variable with a number, then everything is OK. Even if this variable is assigned a numeric value instead of a digit from get, then everything is ok. Already broke his head, what could be the problem?
Traceback:

Answer 1

For some inexplicable reason, it was necessary to wrap from_items in int (). Programming is magic