Good notes posted by bquorning

Pretty way to test for current environment

You can check your current Rails environment using nice methods such as:

Rails.env.development?
Rails.env.test?
Rails.env.production?
Rails.env.your_custom_environment?

Have the check_box checked by default

To have the check box checked by default, pass either :checked => true or :checked => 'checked' in the options. See ActionView::Helpers::InstanceTag#to_check_box_tag for details.

Ruby's exception hierarchy

Ruby’s exception hierarchy, according to http://blog.nicksieger.com/articles/2006/09/06/rubys-exception-hierarchy:

Exception

NoMemoryError
ScriptError
  LoadError
  NotImplementedError
  SyntaxError
SignalException
  Interrupt
StandardError
  ArgumentError
  IOError
    EOFError
  IndexError
  LocalJumpError
  NameError
    NoMethodError
  RangeError
    FloatDomainError
  RegexpError
  RuntimeError
  SecurityError
  SystemCallError
  SystemStackError
  ThreadError
  TypeError
  ZeroDivisionError
SystemExit
fatal