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Extensions to Ruby s Range class
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B411 active support/core ext/range/
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Ruby s native Range#step (on most platforms) raises a LocalJumpError if you omit a block Rails patches step to make it return an array if it s called without a block
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B41 Range
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B412 active support/core ext/range/
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conversions
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to formatted s(format = :default)
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Active Support
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Generates a formatted string representation of the range
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>> => >> => (20daysago10daysago)to_formatted_s "Fri Aug 10 22:12:33 -0400 2007Mon Aug 20 22:12:33 -0400 2007" (20daysago10daysago)to_formatted_s(:db) "BETWEEN '2007-08-10 22:12:36' AND '2007-08-20 22:12:36'"
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include range
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include (value)
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>> (15)include (15) => true >> (15)include (23) => true >> (15)include (26) => false
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The native include behavior is untouched
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>> ("a""f")include ("c") => true >> (59)include (11) => false
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B414 active support/core ext/range/
include range
overlaps (other)
Compares two ranges and sees if they overlap each other
>> (15)overlaps (46) => true >> (15)overlaps (79) => false
Appendix B: Active Support API Reference
B42 Regexp B421 active support/core ext/enumerable
sum(identity = 0)
Optimizes range sum to use arithmetic progression if a block is not given and we have a range of numeric values
B422 active support/json/encoding
as json
Returns selfto_s
B43 ActiveSupport::Rescuable
The Rescuable module is a Concern that adds support for easier exception handling Used within Rails primarily in controller actions, but potentially very useful in your own libraries too
B431 active support/rescuable
rescue from(*klasses, &block)
The rescue_from method receives a series of exception classes or class names, and a trailing :with option with the name of a method or a Proc object to be called to handle them Alternatively a block can be given Handlers that take one argument will be called with the exception, so that the exception can be inspected when dealing with it Handlers are inherited They are searched from right to left, from bottom to top, and up the hierarchy The handler of the first class for which exceptionis_a (klass) returns true is the one invoked, if any Here s some example code taken from Action Controller
class ApplicationController < ActionController::Base rescue_from User::NotAuthorized, :with => :deny_access rescue_from ActiveRecord::RecordInvalid, :with => :show_errors rescue_from 'MyAppError::Base' do |exception| render :xml => exception, :status => 500 end protected def deny_access end
B44 ActiveSupport::SecureRandom
def show_errors(exception) exceptionrecordnew end end
Active Support
B44 ActiveSupport::SecureRandom
A secure random number generator interface This library is an interface for secure random number generator which is suitable for generating session key in HTTP cookies, etc It supports following secure random number generators
openssl /dev/urandom Win32
Note: This module is based on the SecureRandom library from Ruby 19, revision 18786, August 23 2008 It s 100 percent interface-compatible with Ruby 19 s SecureRandom library
# p p p p p # p p p p p p random hexadecimal string SecureRandomhex(10) #=> "52750b30ffbc7de3b362" SecureRandomhex(10) #=> "92b15d6c8dc4beb5f559" SecureRandomhex(11) #=> "6aca1b5c58e4863e6b81b8" SecureRandomhex(12) #=> "94b2fff3e7fd9b9c391a2306" SecureRandomhex(13) #=> "39b290146bea6ce975c37cfc23" random base64 string SecureRandombase64(10) SecureRandombase64(10) SecureRandombase64(10) SecureRandombase64(11) SecureRandombase64(12) SecureRandombase64(13)
#=> #=> #=> #=> #=> #=>
"EcmTPZwWRAozdA==" "9b0nsevdwNuM/w==" "KO1nIU+p9DKxGg==" "l7XEiFja+8EKEtY=" "7kJSM/MzBJI+75j8" "vKLJ0tXBHqQOuIcSIg=="
# random binary string p SecureRandomrandom_bytes(10) #=> "\016\t{\370g\310pbr\301" p SecureRandomrandom_bytes(10) #=> "\323U\030TO\234\357\020\a\337"
B441 active support/secure random
Note that all of the methods in this module will raise NotImplementedError if a secure random number generator is not available
Appendix B: Active Support API Reference
SecureRandombase64(n = 16)
This method generates a random base64 string The argument n specifies the length of the random length The length of the result string is about 4/3 of n
SecureRandomhex(n = 16)
This method generates a random hex string The argument n specifies the length of the random length The length of the result string is twice of n
SecureRandomrandom number(n = 0)
This method generates a random number If an positive integer is given as n, then random_number returns an integer
0 <= SecureRandomrandom_number(n) < n
If 0 is given or an argument is not supplied then random_number returns a float
00 <= SecureRandomrandom_number() < 10
SecureRandomrandom bytes(n = 16)
This method generates a random binary string The argument n specifies the length of the result string
B45 String
Extensions to Ruby s String class
B451 active support/json/encoding
as json
Returns self
encode json
Returns JSON escaped version of self
B452 active support/core ext/object/blank
blank
Returns true if the string consists of only whitespace
class String def blank self !~ /\S/ end end
B45 String
B453 active support/core ext/string/access
at(position)
Returns the character at position, treating the string as an array (where 0 is the first character) Returns nil if the position exceeds the length of the string
>> "hello"at(0) => "h" >> "hello"at(4) => "o" >> "hello"at(10) => ERROR if < 19, nil in 19
Active Support
blank
Returns the result of empty (stripping whitespace, if needed)
first(number)
Returns the first number of characters in a string
"hello"first # => "h" "hello"first(2) # => "he" "hello"first(10) # => "hello"
from(position)
Returns the remaining characters of a string from the position, treating the string as an array (where 0 is the first character) Returns nil if the position exceeds the length of the string