Ruby Exception Class Hierarchy

This note summarizes the ruby exception Show archive.org snapshot hierarchy.

Exception
  NoMemoryError
  ScriptError
    LoadError
    NotImplementedError
    SyntaxError
  SignalException
    Interrupt
      Timeout::Error    # < ruby 1.9.2
  StandardError         # caught by rescue (default if no type was specified)
    ArgumentError
    IOError
      EOFError
    IndexError
    LocalJumpError
    NameError
      NoMethodError
    RangeError
      FloatDomainError
    RegexpError
    RuntimeError
      Timeout::Error    # >= ruby 1.9.2
    SecurityError
    SocketError
    SystemCallError
    SystemStackError
    ThreadError
    TypeError
    ZeroDivisionError
  SystemExit
  fatal

Ulrich Berkmueller

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Last edit

Almost 10 years ago

Keywords

error

License

Source code in this card is licensed under the MIT License.

Defining custom errors in Ruby

class Errormaster
  CoffeeIsOut = Class.new(StandardError)
  
  # is prettier than
  class CoffeeIsOut < StandardError; end
end

Reference such an error class with Errormaster::CoffeeIsOut.

Ruby: All Errno::ERROR constants inherit from SystemCallError

To catch all possible exceptions from a network call, we need to rescue many error classes like this:

rescue SocketError, Errno::ECONNREFUSED, Errno::ECONNRESET, Errno::ECONNABORTED, Errno::EHOSTUNREACH, OpenSSL::SSL::SSLError, MyHttpLi...

Posted by Ulrich Berkmueller to makandra dev (2012-01-11 14:38)

Ruby Exception Class Hierarchy

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