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• In Ruby, in the context of a class method, what are instance and class variables?

  - by J. Pablo Fernández

  If I have the following piece of Ruby code: class Blah def self.bleh @blih = "Hello" @@bloh = "World" end end What exactly are @blih and @@bloh? @blih is an instance variable in the class Blah, and @@bloh is a class variable in the class Blah, correct? Does it mean that @@bloh is a variable in Blah's class, Class?

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• How can I check if a Ruby array includes one of several values?

  - by Colen

  I have two Ruby arrays, and I need to see if they have any values in common. I could just loop through each of the values in one array and do include?() on the other, but I'm sure there's a better way. What is it? (The arrays both hold strings.) Thanks.

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• ruby or python more suitable for scripting in all OSes?

  - by fayer

  if i want to script a mini-application (in the Terminal) in mac and windows, which one is preferred: ruby or python? or is there no major difference just a matter of taste? cause i know python definetely is a good scripting language. thanks

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• How to emulate PHPs preg_split in ruby to capture offsets and delimiters?

  - by dimus

  I wonder if there is a way to get offsets and delimiters while I am splitting a string in ruby analagous to PHP preg_split: preg_split("/( |&nbsp;|<|>|\t|\n|\r|;|\.)/i", $html_string, -1, PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_OFFSET_CAPTURE); I imagine I can achieve it by traversing string by characters or using something heavy as treetop, but I would like to use something more convenient.

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• Ruby equivalent to JavaScript’s encodeURIComponent that produces identical output?

  - by Mo

  Hi is there an equivalent ruby method to JavaScript encodeURIComponent method? i am using the URI.unescape(str) but it recognizes the "£" (after encodeURIComponent it becomes "%C2%A3") as a "?" sign. any solution's? thanks

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• What are PHP's advantages over Ruby on Rails and Django?

  - by flybywire

  PHP was the undisputed king of easy webapp development, until Ruby on Rails, Django, and other dynamic programming frameworks appeared. What are, in your opinion, PHP's strengths against the newcomers?

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• How do I put an escape character (NOT "escaped" character) in a Ruby regex?

  - by Amy

  I'm trying to parse a text file that has ANSI color sequences in it, e.g. \e[0;37m How can I build a regex to match this in Ruby?

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• In Ruby on Rails, how is view code able to use instance variables that are set inside the controller

  - by Jian Lin

  In Ruby on Rails, how is an ActionView object able to access the instance variables of ActionController object (how is view code able to use instance variables that are set inside the controller code)?

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• ruby-on-rails: string, decimal or float for price field?

  - by fayer

  i've got a price field/column and i wonder should the rails datatype be string, decimal or float? eg. 15.50 USD. thanks

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• Does ruby on rails have issues with regards to max # of threads the server and serve?

  - by Blankman

  Does ruby on rails have issues with regards to max # of threads the server and serve? i.e. you have to run multiple instances of the server if you reach high load?

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• Why doesn't this simple Ruby program print what I expect it to?

  - by Michael Braxton

  I have this: require 'tempfile' t = Tempfile.new('test-data') t.open t.sync = true t << "apples" t.puts "bananas" puts "contents are [#{t.read}] (#{t.size} bytes)" t.close This prints: contents are [] (14 bytes) Why aren't the contents actually shown? I'm on Ruby 1.9.2.

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• how to run my scrip x times a day? (ruby on linux)

  - by Radek

  I want to run my ruby script x times a day (the number might change) on my linux box. What would be the best way to do so if I do not what it happen at the same time? I want the time (hour and minute) to be random

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• How can I find unused methods in a Ruby app?

  - by Geo

  I have a Ruby app with a lot of classes/modules, and some of them are not used. Is there an easy way of finding out which? I was thinking to do a profile, and then work with it's output. Any other ideas?

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• I have a ruby view that has this namespace: ActionView::Base.new but i want to add a new method to b

  - by Totty

  I have a ruby view that has this namespace: ActionView::Base.new but i want to add a new method to be available to this ActionView::Base class.

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• convert Ruby to C languge, Would anyone care to take a look?

  - by alaamh

  I have seen this sample written in Ruby code, how i can simulate it in C language? Open3.popen3(command) do |stdin, stdout, stderr| @stop_stdin = stdin while !stdout.eof do output = stdout.read(1024 * 100) list_pipes.each do |out| out.print output end end end

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• Why so many ASP.NET programmers play with Ruby on Rails after working hours?

  - by ITmeze

  I saw that on so many blogs. Lots of the people that were dealing with ASP.NET tend to play with Ruby on Rails after working hours. And It is just a matter of last one or two years. Why is it like that? Is it because when ASP.NET MVC showed up people become more open-minded - having joy with programming again they realize that some other folks had that many years ago, and they do not want to miss what they currently have?

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• How do I rescue from a `require': no such file to load in ruby?

  - by René Nyffenegger

  I am trying to rescue from a `require': no such file to load in ruby in order to hint the user at specifying the -I flag in case he has forgotten to do so. Basically the code looks like: begin require 'someFile.rb' rescue puts "someFile.rb was not found, have you" puts "forgotten to specify the -I flag?" exit end I have expected the rescue part to take over execution in case someFile.rb was not found, but my assumption was wrong.

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• How to tell Ruby not to serialize an attribute or how to overload marshal_dump properly?

  - by GregMoreno

  I have an attribute in my AR:B that is not serializeable. o = Discussion.find(6) Marshal.dump(o) TypeError: no marshal_dump is defined for class Proc from (irb):10:in `dump' I know the culprit and what I want is to set this variable to nil before any serialization takes place. I can do this but I'm stuck with the proper way to override marshal_dump def marshal_dump @problem = nil # what is the right return here? end Or is there is way to tell Ruby or AR not to serialize an object?

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• How do I find where a ruby method is declared?

  - by Joe Fair

  I have a ruby method (deactivate!) that is on an activeRecord class. However, I can't seem to find where that method is declared. There have been numerous developers on this project, so it could be anywhere. There is a deactivate! on an unrelated class, but it doesn't seem to get called. Any ideas how to find all the superclasses for an instace, or where to find the code for deactivate!?

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• Python vs Groovy vs Ruby? (based on criteria listed in question)

  - by Prembo

  Considering the criteria listed below, which of Python, Groovy or Ruby would you use? Criteria (Importance out of 10, 10 being most important) Richness of API/libraries available (eg. maths, plotting, networking) (9) Ability to embed in desktop (java/c++) applications (8) Ease of deployment (8) Ability to interface with DLLs/Shared Libraries (7) Ability to generate GUIs (7) Community/User support (6) Portability (6) Database manipulation (3) Language/Semantics (2)

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• Ruby Regular Expressions - Checking the start middle and end of a line?

  - by Steven

  Hi, I need to get the "274.20p" out of: <td nowrap="nowrap" class="dataRegularUlOn" style="text-align: right;">274.20p</td> I would like to do regular expressions on: <td class="dataRegularUlOn" > so something like: /<td(.*?)class="dataRegularUlOn"(.*?)>/ I'm using ruby, on linux. thks

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• How to access a (shadowed) global function in ruby.

  - by yngvedh

  Hi, I was wondering how to access a global function fn in ruby from a class which also defined a method fn. I have made a workaround by aliasing the function like so: def fn end class Bar alias global_fn fn def fn # how to access the global fn here without the alias global_fn end end I'm looking for something along the lines of c++'s :: to access global scope but I can't seem to locate any information about it. I guess I don't know specifically what I'm looking for.

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• Moving rails javascript to public while keeping ruby code?

  - by tesmar

  Hi guys, I have a project to move some JS code outside of rails into the public direcotry, but some of it has ruby code embedded, and depends on the values of the variables from the controllers to set some of its code. How can I move it out of the view and still maintain the same structure, or do I need to just rewrite the JS from scratch?

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• What kind of memory reclamation algorithm does MRI Ruby 1.8 use?

  - by Foo

  In other languages you have a number of possibilities usually for memory reclamation: Mark objects and then remove them Explicit retain and release Count references to objects Internal heap disposition How does Ruby work?

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• Api/plugins for open source libraries?

  - by fayer

  whenever i use a open source library eg. Doctrine i always ending up coding a class (so called Facade) to use the Doctrine library. so next time i want to create a user i just type: $fields = array('name' => 'peter', 'email' => '[email protected]'); Doctrine_Facade::create_entity($entity, $fields); then it creates an entity with the provided information. so i guess, all coders will create their own "Facade". i wonder how usual it is with open source Facades to download and interact with the open source libraries? is this rare cause i haven't seen any of these. in some frameworks i have seen them called plugins, eg. plugins for twitter api or facebook api. so whenever you download a library, should you search for plugins/facades on the net, or is it better to just try coding your own? i just thought it would be great for everyone not to reinvent the wheel. thanks.

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