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• Determining whether one array contains the contents of another array in ruby

  - by Andrew Grimm

  In ruby, how do I test that one array not only has the elements of another array, but contain them in that particular order? correct_combination = [1, 2, 3, 4, 5] [1, 5, 8, 2, 3, 4, 5].function_name(correct_combination) # => false [8, 10, 1, 2, 3, 4, 5, 9].function_name(correct_combination) # => true I tried using include, but that is used to test whether [1,2,3].include?(2) is true or not.

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• Methods in Ruby: objects or not?

  - by Mladen Jablanovic

  Inspired by this discussion, after some googling I wasn't able to find an answer to a pretty simple question regarding methods in Ruby: are they objects or not? There are different opinions here and there, and I would really like to hear, let's say, an in-depth explanation. I'm aware of Object#method method, which takes a method name and returns a Method instance, but, on the other hand, there's a similar thing you can do with blocks to make them into Proc instances, and blocks aren't objects, so what makes methods any different?

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• Use ruby Timeout class as background thread

  - by turri

  I found ruby class Timeout very useful for my project. But i need to run a block of code in background and keep it under a timeout.. For example Timeout::timeout(2) { block.call } How to do that?

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• Ruby: Allowing a module to have settings

  - by JP

  If I'm building a library in ruby, what's the best way to allow users of the library to set module-wide settings that will be available to all sub classes etc of the library? A good example would be if I'm writing a library for posting to a webservice: TheService::File.upload("myfile.txt") # Uploads anonymously TheService::Settings.login("myuser","mypass") # Or any other similar way of doing this TheService::File.upload("myfile.txt") # Uploads as 'myuser' The idea would be that unless TheService::Settings.logout is called then all TheService operations would be conducted under myuser's account. Any ideas?

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• Is Spring hard compared to Ruby on Rails?

  - by johnny

  If I have no to little experience in either of them, but know enough Java and Ruby to be comfortable, is one framework harder to learn than the other? Is one easier to use for the beginner on these? I know it is hard to answer. Just looking for general thoughts on it.

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• Looking to clean up a small ruby script.

  - by Badweather

  I'm looking for a much more idiomatic way to do the following little ruby script. File.open("channels.xml").each do |line| if line.match('(mms:\/\/{1}[a-zA-Z\.\d\/\w-]+)') puts line.match('(mms:\/\/{1}[a-zA-Z\.\d\/\w-]+)') end end Thanks in advance for any suggestions.

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• difference between scope and namespace of ruby-on-rails 3 routing

  - by fayer

  i cant understand what the difference is between a namespace and a scope in the routing of ruby-on-rails 3. could someone please explain? namespace "admin" do resources :posts, :comments end scope :module => "admin" do resources :posts, :comments end thanks

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• Ruby hash value truthiness and symbols

  - by John Topley

  Could somebody please explain why the variable named foo remains true in the code below, even though it's set to false when the method is called? And why the symbol version behaves as expected? def test(options = {}) foo = options[:foo] || true bar = options[:bar] || :true puts "foo is #{foo}, bar is #{bar}" end >> test(:foo => false, :bar => :false) foo is true, bar is false I've only tried this using Ruby 1.8.7.

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• Ruby on Rails: extending ActiveRecord::Errors

  - by randombits

  In Ruby on Rails, where does one put the code from this snippet in http://gist.github.com/376389? I want to extend ActiveRecord::Errors with the code that's available there so I can merge error messages. Is this something for ApplicationController? or for lib?

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• Converting ANSI to UTF8 with Ruby

  - by HelloWorld

  I have a Ruby script that generates a ANSI file. I want to converting ANSI to UIF8 file. What's the easiest way to do it?

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• passing a parameter from an other model on ruby

  - by MAGE

  I'm very newbie in ruby and need your help. I must save a "Topic" and make it like this : @topic = Topic.new(params[:topic]) But I would like to pass an other information to this topic. It has a field "community_id" that link it to a community. The logged user has this information on his table. How can I pass the "community_id" from the logged user to the "community_id" of the "topic" created ? thx for your help

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• Getting a substring in Ruby by x number of chars

  - by wotaskd

  I'm trying to produce some Ruby code that will take a string and return a new one, with a number x number of characters removed from its end - these can be actual letters, numbers, spaces etc. Ex: given the following string a_string = "a1wer4zx" I need a simple way to get the same string, minus - say - the 3 last digits. In the case above, that would be "a1wer". The way I'm doing it right now seems very convoluted: an_array = a_string.split(//,(a_string.length-2)) an_array.pop new_string = an_array.join Any ideas?

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• Accessing objects memory address in ruby..???

  - by levirg

  hey Folks, Is there any way in ruby to get the memory address of objects.. say.. (i = 5) is that possible to get the mem address of that object 5.. I have been trying to get this over some time.., Any answer would be really appreciated... thanks, Regards levirg

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• Debugging in ruby 1.9

  - by cloudhead

  What do you guys use for debugging in ruby 1.9? rdebug doesn't seem to be compatible.. is there anything out there?

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• Ruby: On what defining a class evaluates to

  - by wilhelmtell

  In Ruby, why does defining a class evaluate to nil? Same goes for defining a method: why does it evaluate to nil? Wouldn't it be useful if defining a class would evaluate as the class?

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• Ruby multiple background threads

  - by turri

  I need to run multiple background threads in a thread pool with timeout. The scheme is something like: #!/usr/bin/env ruby require 'thread' def foo(&block) bar(block) end def bar(block) Thread.abort_on_exception=true @main = Thread.new { block.call } end foo { sleep 1 puts 'test' } Why if i run that i get no output? (and no sleep wait?)

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• ruby sortby 3rd element in a multidimential array npot working properly

  - by Steven

  Hi, I'm using ruby to sort an array where each element in the array is another array. I have this: Data = Data.SortBy { |Info| info[3] } example data in this column: 3.1 2 5.65 -1 0.4 -9.43 -10.87 -2.3 It should sort this into: 5.65 3.1 2 0.4 -1 -2.3 -9.43 -10.87 But it comes out like this: 5.65 3.1 2 0.4 -1 -10.87 -2.3 -9.43 It's only comparing the first char of the float... not the whole number?

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• How to I make private class constants in Ruby

  - by DMisener

  In Ruby how does one create a private class constant? (i.e one that is visible inside the class but not outside) class Person SECRET='xxx' # How to make class private?? def show_secret puts "Secret: #{SECRET}" end end Person.new.show_secret puts Person::SECRET # I'd like this to fail

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• Malthusian Growth Model in Ruby

  - by GregDean

  Hello. I am interested in modeling a Malthusian growth model in Ruby. Does anyone have any ideas, or are there any interesting libraries that cover this? Any help is appreciated. http://en.wikipedia.org/wiki/Malthusian_growth_model

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• class_eval in ruby?

  - by fayer

  i dont understand class_eval in ruby. http://pastebin.com/RMnvTCyz what does the % mean? what does class_eval do? and where is (val) coming from? thanks

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• Ruby equivalent to .NET's Encoding.ASCII.GetString(byte[])

  - by flyerhzm

  Does Ruby have an equivalent to .NET's Encoding.ASCII.GetString(byte[])? Encoding.ASCII.GetString(bytes[]) takes an array of bytes and returns a string after decoding the bytes using the ASCII encoding.

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• watch / read a growing log file with ruby

  - by KingInk

  I have a log file that is constantly growing, how can I watch and parse it via a ruby script. The script will parse each new line as it is written to the file and output something to the screen when the new line contains the string 'ERROR'

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• alternative to rescue in ruby ?

  - by wefwgeweg

  it seems like i have begin rescue end statements everywhere in my code. this doesn't seem like the correct thing to do. i am learning process, can anyone suggest how can i catch any exceptions without having to place everything inside begin,rescue, end. anyway to just tell ruby to shut up and just keep going even if exception is raised ?

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• ruby get Time in given timezone

  - by ashweta

  In ruby, how can I get current time in a given timezone? I know the offset from UTC, and want to get the current time in the timezone with that offset.

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• Processing Zip files in Ruby

  - by djsnowsill

  Is anybody aware of a open source Ruby library that allows the user to process zip file entries in memory? i.e. without writing them to disk

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