I stumbled upon a corner case where Kaminari explodes with a divided by 0 error and wanted to offer a fix. The usage is a little contrived / self inflicted, but kaminari should probably be more resilient to user silliness.

Repro:

Kaminari::PaginatableArray.new([]).page(n).per(0).per(3)
# kaminari-core/lib/kaminari/models/page_scope_methods.rb:17:in `/': divided by 0 (ZeroDivisionError)

# or

Model.page(n).per(0).per(3)
# kaminari-core/lib/kaminari/models/page_scope_methods.rb:17:in `/': divided by 0 (ZeroDivisionError)

the issue arises because in .per, this library uses limit_value to recalculate the new offset value. but if limit_value is 0, it explodes. It's unclear what the offset should be set to (since we don't store page number, only offset), but resetting to 0 seemed sane.

Open to a bugfix?