Frederick Cheung questions

Frederick Cheung answers

• How to check that a ruby value is a non-negative float?
• Can't access s3 buckets after creating instance using IAM profile
• bad URI(is not URI?) in tests Rspec [duplicate]
• Share session between two rails4 applications
• If exists update else create. Either case return the record
• Using 'they' instead of 'it' in RSpec
• Safe way to increase field value in rails AR
• When the protocol is https, Amazon S3 assets won't load, - Rails, Heroku
• Rails "please wait" page
• ActiveRecord count of distinct days from created_at?