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• Where goes signal sent to process which called system?

  - by tig

  Given a very simple ruby script: child = fork do system 'sleep 10000' end 5.times do sleep 1 puts "send kill to #{child}" Process.kill("QUIT", child) end QUIT signal is just lost. Where does it go? Something with default handler which just ignores it?

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• how to write nslookup programmatically?

  - by Jian Lin

  instead of using exec in our script to do an nslookup, is there an easy way to write it programmatically in PHP, Python, or Ruby?

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• Tired of ASP.NET, which of the following should I learn and why?

  - by ke42

  Which of the following technology is easy to learn and fun for developing a website? If you could only pick one which would it be and why Clojure/Compojure+Ring/Moustache+Ring Groovy/Grails Python/Django Ruby/Rails Turbogear Cappuccino or Sproutcore Javascript/jQuery

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• Image resizing web service

  - by gwik.

  Does someone know a good web service to resize images ? Either an open source (PHP/Python/Ruby) application, or a company providing a web service api.

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• More elegant way to write this?

  - by tesmar

  Hi, I am trying to make a multi-dimensional array of characters in ruby, and this works, but is there a more elegant way? def initialize(text) @map = Array.new i = 0 text.split("\n").each do |x| @map[i] = x.scan(/./) i += 1 end #@map = text end#constructor

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• Rails on Google App Engine - Error on OS X development machine

  - by Phillip Parker

  Hi, I'm running through the Ruby on Rails tutorial at http://guides.rubyonrails.org/getting_started.html (adjusting where appropriate for Google's App Engine). All is well up till section 6.3: when I try to click "New Post", I get the following error: Internal Server Error (500) Request Method: GET Request URL: http://localhost:8080/500.html access denied (java.io.FilePermission /dev/urandom read) It works fine when I upload the application to Google's App Engine; it's just on my development machine (OS X 10.6) that it doesn't work. Thanks in advance.

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• What is called a rakefile ?

  - by Bragaadeesh

  Hi, I have started learning Ruby and just tried out my first hello world program in NetBeans IDE. I have one doubt, I can see that the new project wizard created set of package structure. It had one "Rakefile" in it. What does that mean and what is the use of it? Thanks, Bragaadeesh.

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• How to invoke a method every time database is modified

  - by titaniumdecoy

  I am writing a Ruby on Rails app and I want a method to be called every time the database is modified. Is it possible to do this without inserting a method call in every location where the database is modified?

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• Problem with writing a file to excel with spreadsheet

  - by winter sun

  I am trying to write excel file by using ruby 1.9 spreadsheet version 0.6.4.1 on windows. Everything is going ok, until I get to the book.write statement when I write book.write "c:/spreadsheet/excel-file.xls I keep getting the following error No such file or directory - c:/spreadsheet/excel-file.xls Can anyone tell me what I should change in this path name?

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• Ignoring a character along with word boundary in regex

  - by DavidP6

  I am using gsub in Ruby to make a word within text bold. I am using a word boundary so as to not make letters within other words bold, but am finding that this ignores words that have a quote after them. For example: text.gsub(/#{word}\b/i, "<b>#{word}</b>") text = "I said, 'look out below'" word = below In this case the word below is not made bold. Is there any way to ignore certain characters along with a word boundary?

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• RVM: how can I dynamically export gem executable directory in my path?

  - by tommasop

  I installed rvm as root to setup an Ubuntu LTS 8.04 as a web hosting server for my rails apps. rvm is installed in: /usr/local/rvm Everything works fine, gems installation included and users are able to use ruby and gem commands. sudo gem install rails My problem is that the gems EXECUTABLE DIRECTORY is not included in my PATH and thus I cannot use rails command. Is there a way to dynamycally include gems executable directory in my PATH? Can it be done directly through rvm?

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• I see gem in "gem list" but have "no such file to load"

  - by lublushokolad

  I am on Ubuntu10 sudo apt-get install ruby1.9.1-full then download sources of rubygem 1.3.7 and install it sudo ruby setup.rb then, for example, install sinatra sudo gem install sinatra Finally open irb and type require "rubygems" require "sinatra" and get error LoadError: no such file to load -- sinatra from (irb):2:in `require' from (irb):2 from /usr/bin/irb:12:in `<main>' Gem.path is the same to INSTALLATION DIRECTORY from "gem environment"

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• How do I send email in ACtionMailer that is stored in IMAP?

  - by Angela

  When I use my regular client and send email through SMTP for an IMAP account, that outbound email gets saved in the IMAP "Sent" box. How can I have the same behavior when I send email using Ruby on Rails Actionmailer?

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• Mysql question: is there something like IN ALL query?

  - by jaycode

  For example this query: SELECT `variants`.* FROM `variants` INNER JOIN `variant_attributes` ON variant_attributes.variant_id = variants.id WHERE (variant_attributes.id IN ('2','5')) And variant has_many variant_attributes What I actually want to do is to find which variant has BOTH variant attributes with ID = 2 and 5. Is this possible with MySQL? Bonus Question, is there a quick way to do this with Ruby on Rails, perhaps with SearchLogic?

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• Changing Passwords Over Multiple Servers and Services

  - by tesmar

  Hi all, I am looking to automate the changing of passwords across multiple services and servers. For example: I want to change the root paassword to all of my web servers at once. I am thinking of writing a ruby script, but have you guys run across anything already written? If so, would that also give me the ability to change other system passwords like Database passwords and SVN passwords.

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• Getting can't modify frozen string when using string.insert

  - by Richard

  Hi, This is a quick question. I have the following ruby code, which works fine. def add_zeros number, zeros number = number.to_s zeros_to_add = zeros - number.length zeros_to_add.times do number = "0#{number}" end number end But if I replace number = "0#{number}" With number.insert(0, "0") Then I get TypeError: can't modify frozen string, does anyone know why this is?

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• Rails Script/generate error

  - by zeemy23

  I have ruby on rails installed on my ubuntu 8.10 desktop. Script/generate came up with this error. # script/generate undefined method `index' for #<Enumerator: "Rails Info:":each_line> any ideas? Thanks for you help, zeem

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• Error on rake command

  - by user332219

  Hi, Have you an idea about this error message when i run the rake db:migrate command under Aptana ? rake aborted! NoMethodError: undefined method `ord' for 0:Fixnum: SET SQL_AUTO_IS_NULL=0 Thanks Here My Config : Windows XP PRO SP2 Wamp 2.0 Aptana 2.0.4 RubyGems 1.3.5 Ruby 1.8.6

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• Who use class variables in SOAP calls with Savon?

  - by Steffen Roller

  I'm writing a little client using Ruby and Savon. The interface changed significantly from version 0.7 to 0.8.x. All my calls don't work anymore :-(. How can I pass on a local member variable. Please see the example, @userName and @userPassword are not defined within the block. begin @response = @authentication_svc.request :wsdl, "AuthenticateUser" do http.headers["SOAPAction"] = "AuthenticateUser" soap.body = "#{@userName}#{@passwd}" end rescue Savon::SOAP::Fault = e @last_soap_error = e.message end

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• require 'rubygems' for linux but not in windows. why? and can I fix this?

  - by user94154

  I'm setting up a Linux development environment. After installing Ruby and RubyGems, I quickly found out that I need to require 'rubygems' in order to use gems, whereas I do not need to do this in Windows Vista. Is there anything I can do to fix this? Should I even be worrying about it?

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• Redirect the "puts" command output to a log file

  - by Josh Moore

  Hi, I am working on creating a daemon in Ruby using the daemons gem. I want to add output from the daemon into a log file. So I am wondering what is the easiest way to redirect puts from the console to a log file?

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• Sort by ranking algorithm using will-paginate

  - by bearwithclaws

  I'm creating a digg-like site using Ruby on Rails that ranks the item (based on this algorithm). I'm using the will-paginate gem list the items in pages. The problem is, will-paginate only allows me to insert ':order =' based on the table data. I would like to make will-paginate to sort by a number which is calculated using a function based on different fields on the table (e.g number of votes, age hours). How can I do that?

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• how to restrict a web portal to a particular computer?

  - by ZX12R

  I am in the process of creating a Ruby on rails portal This portal requires a lot of data feeding by the site owner's back-office personnel. My client has this problem : the office staff should not be able to access the back office interface from any other than his office computers I have no idea how to achieve this. Is there a method for this? Thanks in advance.

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• why do I need the @ for setting variable value

  - by Saad

  I'm a little confused about scope of variables, in ruby I wrote a test program: class Test attr_reader :tester def initialize(data) @tester = data end def getData tester end end puts Test.new(11).getData now this works fine, the attr_reader, but my confusion is that since I've define attr_reader :tester then why can't I go tester = data rather then @tester = data, because when retrieving the data in getData I only have to write tester and not @tester

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• "OR" Operator must be placed at end of previous line? (unexpected tOROP)

  - by akonsu

  I am running Ruby 1.9. This is a valid syntax: items = (data['DELETE'] || data['delete'] || data['GET'] || data['get'] || data['POST'] || data['post']) But this gives me an error: items = (data['DELETE'] || data['delete'] || data['GET'] || data['get'] || data['POST'] || data['post']) t.rb:8: syntax error, unexpected tOROP, expecting ')' || data['GET'] || data['get'] |... ^ Why?!

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