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• Best practice to handle non-english characters is ruby?

  - by ragnarius

  Hi! My program file is encoded in utf-8 so "abc".length==3 but "åäö".length==6. I realize that å,ä,ö, are stored as two bytes in utf-8, and that a ruby String is a sequence of bytes (not characters), but it is annoying! Is there a best practice to work around this problem?

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• How to monitor traffic of ruby on rails website?

  - by Tony

  I have a ruby on rails application and it would be nice to see how many hits I get per hour. Is there some simple free software to do this or do I have to develop a custom solution? Thanks!

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• With Ruby, where to use NOT, AND, OR, XOR operations for Fixnum or Bignum?

  - by Jason

  Hi, Just wondering if anyone has any realworld examples or know when you might use the NOT, AND, OR, XOR, <<, operators in Ruby. I've been programming for 4 years and never come across the need to use any of these, wondering how common actual usage is & if its something I should fully understand. Thanks, -J

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• How can I host my Ruby on Rails application - no hosting providers offer SQLite3 database.

  - by Sergio Tapia

  I'm really new at Ruby on Rails development. I'm reading Head First Rails and it says that Rails uses SQLite3 as it's database system. How exactly would I go about uploading my website/application so the world can use it?

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• Is there a static analysis tool for Python, Ruby, Sql, Cobol, Perl, and PL/SQL?

  - by Raj

  I am looking for a static analysis tool for Python, Ruby, Sql, Cobol, Perl, PL/SQL, SQL similar to find bugs and check style. I am looking for calculating the line count, identify bugs during the development, and enforcing coding standard.

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• How do you kill a PTY.spawn call in Ruby?

  - by viatropos

  If I run a command like this, using ruby's pty class, how do I kill it if I find a certain input string? cmd = "appcfg.py update cdn" PTY.spawn("#{cmd} 2>&1") do | input, output, pid | begin input.expect("Email:") do output.write("#{credentials[:username]}\n") end input.expect("Password:") do output.write("#{credentials[:password]}\n") end if input.gets == "SOMETHING" EXIT! end rescue Exception => e puts "GAE Error..." end end What is the right way to do that?

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• How to build a Weighted Graph with Ruby's RGL or GRATR to perform Dijkstra's algorithm?

  - by Andres

  I would like to see an example of a Dijkastra search algorithm for a graph built using Ruby's RGL (http://rgl.rubyforge.org/) or GRATR (http://rubyforge.org/projects/gratr/). I know GRATR has Dijkastra support but I'm not really sure how to go about using it, any help would be appreciated.

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• Front-end design first, or back-end development first? For Ruby on Rails site

  - by Victor

  I am doing everything on my own: front-end and back-end. I am proficient with HTML and CSS, but a noob in Ruby on Rails. Now that I want to develop the site, I wonder if I should start from front-end first, or back-end. Cos what I am doing for front-end now are all static. I am afraid that I have to change a lot of my front-end coding when I do my back-end.

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• Can I have a block in begin/while statement in Ruby?

  - by jbjuly

  I'm trying out to have a block in a while and begin statements in Ruby, but I get a syntax error. Any other way to implement it? Here's what I want to accomplish (1..limit).each { |i| while (true) do |n| x = n * (i%n) puts n if n%i != 0 break if x.even? && !x.zero? n += 1 end }

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• possible to output current CPU and MEM usage via ruby script ? i am trying to find memory leaks

  - by puqt

  is it possible to say output the current consumption of CPU and memory in ruby script ?rub i am trying to find memory leaks in my jruby sript. CPU usage keeps going up to 100% until it crashes.

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• How do I completely uninstall rails, ruby and rubygems?

  - by JZ

  My system is F'd. How do I completely uninstall rails, ruby and rubygems? any suggestions on where to go to reinstall from scratch? Best practices? I'd like to get back to 3.0 beta Thanks!

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• What's the difference between the ruby irb prompt modes?

  - by Steven

  I can change the irb prompt mode with irb --prompt prompt-mode I can see what null and simple does, but I can't tell the difference between null and xmp and the difference between default/classic/inf-ruby. Can someone explain to me what these other modes do? It seems pointless to have multiple modes doing the same thing.

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• Specify private SSH-key to use when executing shell command with or without Ruby?

  - by Christoffer

  A rather unusual situation perhaps, but I want to specify a private SSH-key to use when executing a shell (git) command from the local computer. Basically like this: git clone [email protected]:TheUser/TheProject.git -key "/home/christoffer/ssh_keys/theuser" Or even better (in Ruby): with_key("/home/christoffer/ssh_keys/theuser") do sh("git clone [email protected]:TheUser/TheProject.git") end I have seen examples of connecting to a remote server with Net::SSH that uses a specified private key, but this is a local command. Is it possible? Thanks

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• What grammar based parser-generator tools exist for ruby?

  - by cartoonfox

  What open source (preferably gem-based) parser-generator options do I have in Ruby? I've used (flex&bison)|(lex&yacc) from C in the past, and I'm comfortable with BNF-style specifications. I've heard of treetop, but it looks a bit alien and verbose compared to yacc... Purpose: I want to convert my text markup language to a BNF and generate the parsing code. I think it's a better strategy than my first-order solution: http://github.com/dafydd/semantictext/blob/master/lib/semantictext/rich_text_parser.rb

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• Convert Ruby array of tuples into a hash given an array of keys?

  - by Kit Ho

  I have an simple array array = ["apple", "orange", "lemon"] array2 = [["apple", "good taste", "red"], ["orange", "bad taste", "orange"], ["lemon" , "no taste", "yellow"]] how can i convert in to this hash whenever element in array match the first element of each element in array2? hash = {"apple" => ["apple" ,"good taste", "red"], "orange" => ["orange", "bad taste", "orange"], "lemon" => ["lemon" , "no taste", "yellow"] } I am quite new to ruby, and spend a lot to do this manipulation, but no luck, any help ?

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• Closest Ruby representation of a 'public static final' class variable in Java?

  - by Hosh

  Given the Java code below, what's the closest you could represent this private static final variable in a Ruby class? public class DeviceController { ... private static final Device myDevice = Device.getDevice("mydevice"); ... public static void main(String args[]) { ... } }

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• Can Ruby access output from shell commands as it appears?

  - by Ciryon

  My Ruby script is running a shell command and parsing the output from it. However, it seems the command is first executed and output saved in an array. I would like to be able to access the output lines in real time just as they are printed. I've played around with threads, but haven't got it to work. Any suggestions?

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• How to assert certain method is called with Ruby minitest framework?

  - by steven.yang

  I want to test whether a function invokes other functions properly with minitest Ruby, but I cannot find a proper assert to test from the doc. The source code class SomeClass def invoke_function(name) name == "right" ? right () : wrong () end def right #... end def wrong #... end end The test code: describe SomeClass do it "should invoke right function" do # assert right() is called end it "should invoke other function" do # assert wrong() is called end end

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• scrap data from jsp web with Nokogiri or other ruby tools?

  - by peng

  there is a jsp web: http://xbrl.cninfo.com.cn/XBRL/allinfo.jsp?stkid=000002&getyear=2005&nowpage=Info.jsp&reportType=GB0110 can i scrap data from it with Nokogiri or other ruby tools?

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• Any way to determine which object called a method? [Ruby]

  - by Joe

  I'm hoping that Ruby's message-passing infrastructure means there's some clever trick for this... How do I determine the calling object -- which object called the method I'm currently in?

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• Is there a simple way to get image dimensions in Ruby?

  - by gruner

  I'm looking for an easy way to get width and height dimensions for image files in Ruby without having to use ImageMagick or ImageScience (running Snow Leapard).

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• How do I add information to an exception message without changing its class in ruby?

  - by Andrew Grimm

  How do I add information to an exception message without changing its class in ruby? The approach I'm currently using is strings.each_with_index do |string, i| begin do_risky_operation(string) rescue raise $!.class, "Problem with string number #{i}: #{$!}" end end Is there a better way?

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• Is there any way to use jQuery like Ruby in IRB mode?

  - by adam

  I love using irb to quickly check how my ruby code reacts. Im wondering is there a way to do the same say in Firebug or soem other tool?

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• Can I have a page in my Ruby on Rails app that doesn't use my application.html.erb template?

  - by ben

  I'm using application.html.erb in the views/layouts folder of my Ruby on Rails web app as a template. But there's one page in which I don't want the template to be used. Is this possible?

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• In HAML on Ruby on Rails, how to use the :sass filter?

  - by Jian Lin

  If using HAML on Ruby on Rails, then :sass #someDiv border: 3px dashed orange won't have any <style> tag around them. and then :css :sass #someDiv border: 3px dashed orange won't kick on the :sass filter, but :css :sass #someDiv border: 3px dashed orange will kick on the :sass filter, but it is outside of the <style> tag. So how can the :sass filter be used?

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