Symbol is also not allowed per default when loading YAML in Ruby. Therefore, you need to add Symbol to the permitted_classes in your case too when reading the YAML file: hash = YAML.load_file( some_file_name, permitted_classes: [Matrix, OpenStruct, Symbol] ) See the list of default permitted_classes in Psych (the YAML parser used by Ruby). Or, when … Read more
According to Date documentation: require ‘date’ Date.new(2001,2,25) #=> #<Date: 2001-02-25 Date.jd(2451966) #=> #<Date: 2001-02-25 Date.ordinal(2001,56) #=> #<Date: 2001-02-25 Date.commercial(2001,8,7) #=> #<Date: 2001-02-25 Date.parse(‘2001-02-25′) #=> #<Date: 2001-02-25 Date.strptime(’25-02-2001’, ‘%d-%m-%Y’) #=> #<Date: 2001-02-25 Time.new(2001,2,25).to_date #=> #<Date: 2001-02-25
You can use ActiveSupport’s TimeWithZone (Time.zone) object to create and parse dates in the time zone of your application: 1.9.3p0 :001 > Time.zone.now => Wed, 11 Jul 2012 19:47:03 PDT -07:00 1.9.3p0 :002 > Time.zone.parse(‘2012-07-11 21:00’) => Wed, 11 Jul 2012 21:00:00 PDT -07:00
ActiveSupport is more separate now in Rails 3. If you want the all active_support thing, you can require ‘active_support/all’ now. But if you want only the blank? method, you can try require ‘active_support/core_ext/string’
Here is the commit (and subsequent discussion) where Memoizable was deprecated: https://github.com/rails/rails/commit/36253916b0b788d6ded56669d37c96ed05c92c5c The author advocates the @foo ||= … approach and points to this commit as an example for migration: https://github.com/rails/rails/commit/f2c0fb32c0dce7f8da0ce446e2d2f0cba5fd44b3. Edit: Note that I don’t necessarily interpret this change as meaning that all instances of memoize can or should be replaced w/ this pattern. … Read more
So unit testing isn’t really in activesupport. Ruby comes with a typical xunit framework in the standard libs (Test::Unit in ruby 1.8.x, MiniTest in ruby 1.9), and the stuff in activesupport just adds some stuff to it. If you are using Test::Unit/MiniTest assert_raise(Exception) { whatever.merge } if you are using rspec (unfortunately poorly documented, but … Read more
To encode a file: require ‘base64’ Base64.encode64(File.open(“file_path”, “rb”).read) To produce the file from the encoded string: require ‘base64’ encoded_string = Base64.encode64(File.open(“file_path”, “rb”).read) File.open(file_name_to_create, “wb”) do |file| file.write(Base64.decode64(encoded_string)) end
Time#localtime will give you the time in the current time zone of the machine running the code: > moment = Time.now.utc => 2011-03-14 15:15:58 UTC > moment.localtime => 2011-03-14 08:15:58 -0700 Update: If you want to conver to specific time zones rather than your own timezone, you’re on the right track. However, instead of worrying … Read more
Since using Rails should handle this automatically I’m going to assume you’re trying to add Active Support to a non-Rails script. Read “How to Load Core Extensions“. Active Support’s methods got broken into smaller groups in Rails 3, so we don’t end up loading a lot of unneeded stuff with a simple require ‘activesupport’. Now … Read more
Rails extends Ruby with both mattr_accessor (Module accessor) and cattr_accessor (as well as _reader/_writer versions). As Ruby’s attr_accessor generates getter/setter methods for instances, cattr/mattr_accessor provide getter/setter methods at the class or module level. Thus: module Config mattr_accessor :hostname mattr_accessor :admin_email end is short for: module Config def self.hostname @hostname end def self.hostname=(hostname) @hostname = hostname … Read more