Frederick Cheung questions

Frederick Cheung answers

• How to choose an operator just one time, instead of repeating the test inside a loop?
• Can't start service with sudo since root user has no access to Ruby
• (ruby gems) warning: duplicated key at line 46 ignored: "index0"
• Explain the usage of procs in an rspec context
• How to request an html page using an ajax request in Rails 3?
• undefined method `sass' for #<Rails::Application::Configuration:0x1cf3338> on Staging
• Memory issue with huge CSV Export in Rails
• Rails 4.1 environment variables not reloading
• Modify Ruby array in C with RubyInline
• after_commit callback is being called several times