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
Check to see if you are using active_record-acts_as. That was the problem with me.
Add the line below to your Gemfile:
gem 'active_record-acts_as', :git => 'https://github.com/hzamani/active_record-acts_as.git'
This will just pull the latest version of the Gem that will hopefully be fixed. Worked for me.