The project that I\'m working on is using MySQL on RDS (mysql2 gem specifically).
When I use a hash of conditions including a range in a where statement
I think you're seeing side effects of ruby personally.
I think the better way to do what you're doing would be with
2.0.0-p481@meri :008 > [*1..5]
=> [1, 2, 3, 4, 5]
User.where(id: [*1..5]).to_sql
"SELECT `users`.* FROM `users` WHERE `users`.`id` IN (1, 2, 3, 4, 5)"
As this creates an Array vs an Array with element 1 of class Range.
OR
use an explicit Range to trigger the BETWEEN in AREL.
# with end element, i.e. exclude_end=false
2.0.0-p481@meri :013 > User.where(id: Range.new(1,5)).to_sql
=> "SELECT `users`.* FROM `users` WHERE (`users`.`id` BETWEEN 1 AND 5)"
# without end element, i.e. exclude_end=true
2.0.0-p481@meri :022 > User.where(id: Range.new(1, 5, true)).to_sql
=> "SELECT `users`.* FROM `users` WHERE (`users`.`id` >= 1 AND `users`.`id` < 5)"