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• Ruby switch like idiom

  - by Eef

  Hey, I have recently started a project in Ruby on Rails. I used to do all my projects before in Python but decided to give Ruby a shot. In the projects I wrote in Python I used a nice little technique explained by the correct answer in this post: http://stackoverflow.com/questions/277965/dictionary-or-if-statements-jython I use this technique due to Python not having a native switch function and it also get rid of big if else blocks I have been trying to do recreate the above method in Ruby but can't seem to quite get it. Could anyone help me out? Thanks Eef

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• more ruby way of doing project euler #2

  - by aharon

  I'm trying to learn Ruby, and am going through some of the Project Euler problems. I solved two as such: def fib(n) return n if n < 2 vals = [0, 1] n.times do vals.push(vals[-1]+vals[-2]) end return vals.last end i = 1 s = 0 while((v = fib(i)) < 4_000_000) s+=v if v%2==0 i+=1 end puts s While that works, it seems not very ruby-ish—I couldn't come up with any good purely Ruby answer like I could with the first one ( puts ( (0..999).inject{ |sum, n| n%3==0||n%5==0 ? sum : sum+n } )).

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• The State of RDF in Ruby

  - by Daniel

  I'm wondering about the current support there is in Ruby for semantic web technologies. Is there good RDF options? It seems that the last surveys done were circa 2007 ( http://paul-classic.stadig.name/2007/10/26/the-state-of-rdf-support-in-ruby-2007/ ). Is Redland's RDF wrappers the best way to go for RDF support - all the other projects mentioned in that aging article seem to be unsupported or dropped. Is Ruby perhaps a bad choice if one which to pursue projects pertaining to the semantic web?

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• Querying Active Directory in ruby app on Windows box

  - by Ben

  I have a small ruby app in which I'm trying to query some information from Active Directory. The app will be run by a Windows user who is already logged in. It looks like the ruby-net-ldap gem wants me to connect to an LDAP server using an IP address, port and then pass my username and password. Is there a way to achieve this (with a different gem, say) so that I don't have to pass this information (I don't have the current user's password for example, so that's not going to work)? I'm also hosting a Trac website on our intranet (which is written in Python if I remember correctly and that seems to know the current Windows username and domain. If it can do it, surely my little ruby app can access this information too?

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• Reference book on Ruby on Rails social network site for novices

  - by Christopher

  Hey, so I am a novice programmer who has only worked with HTML, CSS, and a touch of Java a couple of years ago. I am looking to try to get a social network site up and running on Ruby on Rails and was looking at RailsSpace: Building a Social Networking Website with Ruby on Rails (Addison-Wesley Professional Ruby Series) - Paperback (July 30, 2007) by Michael Hartl. This was published in 2007, however, and the newer reviews say it is not very helpful. Does anyone know if there are any new publications out there that walk you through building a social network site while teaching you the code(rather than just using a out of the box program)? Thanks

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• Storing cvs data for further manipulation using Ruby

  - by ischnura

  I am dealing with a csv file that has some customer information (email, name, address, amount, [shopping_list: item 1, item 2]). I would like work with the data and produce some labels for printing... as well as to gather some extra information (total amounts, total items 1...) My main concern is to find the appropriate structure to store the data in ruby for future manipulation. For now I have thought about the following possibilities: multidimensional arrays: pretty simple to build, but pretty hard to access the data in a beautiful ruby way. hashes: having the email as key, and storing the information in different hashes (one hash for name, another hash for address, another hash for shopping list...) (getting the cvs data in to a Database and working with the data from ruby??) I would really appreciate your advice and guidance!!

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• Creating Ruby applications for Windows.

  - by Omega

  I want to develop a Windows application. Honestly I care little about cross-platforms for now (but still would be good) I want to use Ruby, since it has quite a simple syntax and is so.. well, simple and easy to learn. My application is like a "game level creator", where you can design your own level and then run it with another application which is a "game level player" by reading the project file created by the creator app. You get the idea. Now, I got a new PC and is completely clean. Absolutely no trace of my old Ruby experiments and fails. First of all, I will need to choose a GUI platform for my Ruby application! Can you recommend me one? I have heard of Shoes and Tk, but want to know what you think.

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• Running a Ruby interpreter on iPad

  - by slothbear

  I'll be taking a trip soon with my iPad, without my laptop. I'd like to continue to tinker with Ruby while I'm on the road. I have an iPhone developer program membership, and I'm not interested in submitting this stuff to the app store. I found the shinycocos project, which appears to embed a Ruby interpreter in an app. But I can't get it to run, and it seems pretty customized for running cocos2d stuff. My first goal is to run an interactive command line like Try Ruby!. After that, I'd like to enter small programs in a UITextView and run them. I'd appreciate any clues, tips, or existing projects you might know of.

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• Having difficulty catching postgresql exception in sequel/ruby

  - by mhd

  I have postgresql table that has somekind of unique constraint. I have ruby script that will update this table. The ruby script should be able to switch to UPDATE instead of INSERT when this kind of error occured: PGError: ERROR: duplicate key value violates unique constraint CMIIW, sequel seems cannot catch this exception?? Anyway,sample code below is something that I would like to see to work but apparently not: @myarray.each do |x| fresh_ds = DB["INSERT INTO mytable (id, col_foo) values ('#{x}' ,'#{myhash[x]}')"] result = fresh_ds.insert catch Sequel::Error do fresh_ds = DB["UPDATE mytable set col_foo = '#{myhash[x]} where id = #{x}"] result = fresh_ds.update end end Maybe my ruby code is wrong or I missed something I don't know. Any solution? Thanks. UPDATE: code below works, the error is caught when unique constraint is violated. @myarray.each do |x| begin # INSERT CODE rescue Sequel::Error # UPDATE CODE end end

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• best IDE for ruby on rails

  - by Sanjay

  Having moved from java to ruby, I am struggling to find a good IDE for ruby. I used eclipse on java, so I tried Aptana Studio (previously Radrails), but its not even half as good. Currently I am trying out Netbeans for Ruby. Please suggest me the best RoR IDE out there. I believe TextMate is universally accepted as the best editor on Mac OS X. I am looking for windows. So far it seems netbeans and e-texteditor are worth a try.

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• c struct map to ruby using SWIG

  - by pierr

  Hi, Is there any body can confirm the description here is true? My experience is that I can not use Example::Vector.new at all. C/C++ structs are wrapped as Ruby classes, with accessor methods (i.e. "getters" and "setters") for all of the struct members. For example, this struct declaration: struct Vector { double x, y; }; gets wrapped as a Vector class, with Ruby instance methods x, x=, y and y=. These methods can be used to access structure data from Ruby as follows: $ irb irb(main):001:0> require 'Example' true irb(main):002:0> f = Example::Vector.new #<Example::Vector:0x4020b268> irb(main):003:0> f.x = 10 nil irb(main):004:0> f.x 10.0

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• What does :this means in Ruby on Rails?

  - by Marco

  Hi, I'm new to the Ruby and Ruby on Rails world. I've read some guides, but i've some trouble with the following syntax. I think that the usage of :condition syntax is used in Ruby to define a class attribute with some kind of accessor, like: class Sample attr_accessor :condition end that implicitly declares the getter and setter for the "condition" property. While i was looking at some Rails sample code, i found the following examples that i don't fully understand. For example: @post = Post.find(params[:id]) Why it's accessing the id attribute with this syntax, instead of: @post = Post.find(params[id]) Or, for example: @posts = Post.find(:all) Is :all a constant here? If not, what does this code really means? If yes, why the following is not used: @posts = Post.find(ALL) Thanks

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• make Ruby script run once a second

  - by Matt Hintzke

  I have a ruby script that needs to run about 1 time a second. What I am doing is using a ruby script to keep track of modifications of files in a directory. I want the script to run once a second so that the modifications are updated in "live" time. Basically, I want my script to do the same kind of thing as running "top" on a unix shell. Where the screen is updated every second or so. Is there an equivalent to setInterval in ruby like there is in javascript? Thanks

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• Declaring an integer Range with step != 1 in Ruby

  - by Dan Tao

  Hey guys, I'm completely new to Ruby, so be gentle. Say I want to iterate over the range of even numbers from 2 to 100; how would I do that? Obviously I could do: (2..100).each do |x| if x % 2 == 0 # my code end end But, obviously (again), that would be pretty stupid. I know I could do something like: i = 2 while i <= 100 # my code i += 2 end I believe I could also write my own custom class that provides its own each method (?). I am almost sure that would be overkill, though. I'm interested in two things: Is it possible to do this with some variation of the standard Range syntax (i.e., (x..y).each)? Either way, what would be the most idiomatic "Ruby way" of accomplishing this (using a Range or otherwise)? Like I said, I'm new to the language; so any guidance you can offer on how to do things in a more typical Ruby style would be much appreciated.

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• Errors when using a Ruby On Rails scaffold with a data type of interger

  - by bublebboy

  I am learning Ruby On Rails. I am on a shared hosting with Ruby version 1.8.1 and Rails version 2.3.10. I am working my way through a tutorial at http://railstutorial.org/chapters/a-demo-app?version=2.3#top and at one point in the tutorial it has me run: script/generate scaffold Micropost content:string user_id:interger The tutorial is using the default database, SQLite3. The command works and I use rake db:migrate to create the database. I can view the page listing the microposts (which is empty), but when I try to add a micropost (microposts/new) I get an error undefined method `user_id' for #<Micropost:0x7f710e4988e8> After doing some testing on my own it seems I experience the problem by using the data type of interger. While I understand that using a scaffold is not the best way of building a ruby on rails, I'm just beginning and would still like to know why I am experiencing this problem to help me better understand how rails works.

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• Double "!!" in Ruby [closed]

  - by Alex Maslakov

  Possible Duplicate: What does !! mean in ruby? Ruby, !! operator (a/k/a the double-bang) Sometimes I see a Ruby code like this def sent? !!@sent_at end It seems to be not logical. Is it necessary to use here double !? As far as I'm concerned, it might be just def sent? @sent_at end UPDATE: then what is the difference between these def sent? !!@sent_at end def sent? @sent_at.nil? end def sent? @sent_at == nil end

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• How to install libv8 using a specific version of g++?

  - by Catfish

  I'm trying to install therubyracer gem for a rails project - http://stackoverflow.com/questions/13793533/unable-to-install-therubyracer-on-centos-errors-with-v8-and-gcc and i'm thinking that now that i installed g++44, that all i need to do is get gem install libv8 to use g++44 instead of g++. Is there a way to run gem install libv8 and to have it look at my updated g++ version? Or is there a way to set the default g++ to the g++44 location? some helpful output [root@allthingswebdesign current]# which g++ /usr/bin/g++ [root@allthingswebdesign current]# which g++44 /usr/bin/g++44 [root@allthingswebdesign current]# [root@allthingswebdesign current]# cd /usr/bin/ [root@allthingswebdesign bin]# ls -al g++* -rwxr-xr-x 4 root root 218432 May 10 2012 g++ -rwxr-xr-x 2 root root 263704 Feb 21 2012 g++44 lrwxrwxrwx 1 root root 12 Dec 9 17:21 g++-4.4 -> /usr/bin/g++

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• Mainstream Linux on 1GB HDD

  - by Ariel Nundi

  Hi, I've decided to start learning Linux + Ryby + RoR. The problem is the only personal computer I have is a laptop with 1GB flash card and I can't afford to buy more hardware right now. The laptop has dual core CPU and 2GB of RAM. Can you recommend a Linux distribution I can install? I've tried the netbook version of Ubuntu, but install failed because of lack of space. I'd prefer a more popular distribution, so I can use my skills say on a job. TIA

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• I am trying to set up a ubuntu sever 12.04 on my machine [migrated]

  - by Jseb

  I am trying to set up a server on my home network which will eventually host rails. I am not great in linux server and i try to follow the prompt. I did succesfully get to a black screen which then prompts me to a username then password to then do anything ( assuming). However here what i try to do I kinda fellow his tutorial http://www.ubuntugeek.com/step-by-step-ubuntu-11-04-natty-lamp-server-setup.html but however the command where not 100% like him not in same order but same idea. Then i want to install ubuntu server with gui here the command i try with sudo apt-get upgrade sudo apt-get install ubuntu-desktop Which however give me the following error Err http... inRelease w Failed to fetch ht... So been ignored if i try the desktop one i get E: unable to locate package ubuntu E: unable to locate package desktop So i am assuming i am not connected to the internet, so i try the following command sudo vi /etc/network/interfaces here the output it gives me and i know my gateway on my laptop is 192.168.1.1 address: 192.168.1.148 netmask: 255.255.255.0 network: 192.168.1.0 broadcasts: 192.168.1.255 gateway: 192.168.1.1 Btw i do not know the command to get out of vi and saving it. Err http://us.archive.ubuntu.com precises InRelease Err http://us.archive.ubuntu.com precises-updates InRelease Err http://us.archive.ubuntu.com precises-backports InRelease Reading package lists... Done W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/InRelease W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/InRelease W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backport/InRelease

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• Run Rails 3 app on a Rails 2 server/machine?

  - by chucknelson

  I'm trying to run a Rail 3 (3.0.10) app on a shared joyent smartmachine server (I don't have root access) which has Rails 2 (2.3.11) installed , and I'm not sure what to do after I freeze my Rails 3 app with bundle install --deployment. It seems like with the Rails 3 and bundler gems not being installed on the server locally, my app isn't even recognizing the local version of Rails I have frozen with my app. Has anyone gotten this to work, or have any advice? The server runs Apache, and I think I can get lighttpd installed too - but I'd rather stay with Apache if I can. Also, if it matters, Passenger is not an installed gem either...and I'm not sure I can freeze that with my app. Update 11/30/2011 12:30 PM EST Bundler is not installed on this server, either. Not sure if having that would enable the new Rails 3 "freeze" (bundle --deployment) to work or not...

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• Two threads in a rails initializer file seems to not run them properly

  - by Luccas

  Initially I was using one thread to listen a queue from amazon and works perfectly. aws.rb Thread.new do queue1 = AWS::SQS::Queue.new(SQSADDR['my_queue']) queue1.poll do |msg| ... but now I appended another thread to listen another queue: ... Thread.new do queue2 = AWS::SQS::Queue.new(SQSADDR['my_another_queue']) queue2.poll do |msg| ... and now it seems to not work. Only the last one receives response... I have to join the threads? I can't understand What is going on?

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• What happens when Phusion PassengerMaxPoolSize is reached?

  - by bmurtagh

  The subject of my post pretty much sums up my question: What happens when PassengerMaxPoolSize is reached? For Example: PassengerMaxPoolSize is configured to 40 based off our system specs What happens if all 40 sessions are active (processing a request) and our load balancer passes another session to this particular web server? This would send a 41st session to be processed without an available Passenger process.

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• Cerification for Rails?

  - by Salil

  I have passed SCJP 1.5 for JAVA 3 years back it hepls me to clear BASICS of the JAVA and OOPS. I would like to know if there is any certification exam conducted for the Ruby or Ruby on Rails.providing url details will be more helpful.

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• Execute a Rake task from within migration?

  - by Fabiano PS

  I have a Rake task that loads configuration data into the DB from a file, is there a correct ruby/rails way to call it on a migration up? My objective is to sync my team DB configs, without have to broadcast then to run the migration lalala def self.up change_table :fis_situacao_fiscal do |t| t.remove :mostrar_endereco t.rename :serie, :modelo end Faturamento::Cfop.destroy_all() #perform rake here ! end btw: Admins could clean up some tags? there is 'migrations' and 'migration', same as 'ruby-on-rails' and 'rails'

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• Why am I getting an uninitialized constant error when trying to test cancan abilities in rspec?

  - by midas06

  I'm trying to test cancan abilities using rspec in rails 3 on ruby 1.8.7. when i include the line: require 'cancan/matchers' in my spec file and run rake, i get: .rvm/gems/ruby-1.8.7-p249/gems/cancan-1.1.1/lib/cancan/matchers.rb:1: uninitialized constant Spec (NameError) from ./spec/models/ability_spec.rb:3 How do i set up rspec and cancan correctly?

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