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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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 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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• 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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• 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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• In Ruby, how does one get their IP octet without going through DNS?

  - by user30997

  I can, on some of my systems, get my IP address (192.68.m.n format) by doing this: addr = IPSocket::getAddress(Socket.gethostname()) ...the trouble is that this only works if the name the local machine uses for itself is the name the DNS server associates with it. How *&#( hard can it be for ruby to just return its primary interface's IP address? I have to do this in a platform-independant way or I'd just call ifconfig or ipconfig and parse it.

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• How do I link to an item in the public folder from views/controller_name/page1 in Ruby on Rails?

  - by ben

  How do I link to an item in the public folder from views/controller_name/page1 in Ruby on Rails? Thanks for reading.

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• How can I upgrade my Ruby Gems to the latest version "safely"?

  - by leeand00

  Is there any way that I can upgrade my Ruby Gems, and if it doesn't work (on what I'm upgrading them for), than rollback the changes?

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• Which is a better source control with NetBeans (Ruby on Rails), VSS or Subversion?

  - by Tushar Maru

  Which is better source control with NetBeans (Ruby on Rails), VSS or subversion? I want to use source control, so I want to know which is better for NetBeans (RoR). Visual Source safe or Subversion?

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• What is the difference between include and require in Ruby?

  - by Owen

  My question is similar to this one over here about include and extend. What's the difference between require and include in Ruby? If I just want to use the methods from a module in my class, should I require it or include it?

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