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• What should be the architecture of an urban game system?

  - by pmichna

  I'm going to develop an urban game using a telco API for phone geolocation and sending/receiving messages. A player would pick up one of the scenarios, move around the city and when he hits a given location, he gets a message and possibly has to answer it. I'm wondering, what approach would be the best in my case. I came up with this general idea: Web application as a user interface (user registration, players ranking, scenarios editing) written in Ruby on Rails. Game server (hosting games, game logic like checking players location, sending and receiving messages) written in Ruby. Database (users, scores, scenarios etc.), probably MySQL or someother open source DB. I want to learn Ruby and RoR, that's why I chose these language and framework. Do you think it's a good choice for a game server? Another question: is this project division good? I mean, I have little experience with Ruby and Rails - that's why I'm asking. Maybe it's better to have web application merged with game server and somehow have the server hosting RoR application do the tasks like mobile phone pinging and message sending? How would that be performed? Maybe this is worth mentioning: the API is RESTful, most results are JSON, few are XML.

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• Rubygems on Debian: Gems won't load (LoadError)

  - by daswerth

  I've installed the development version of Crunchbang, a linux distro based off Debian. I got Ruby and Rubygems installed, but I can't get the gems I've installed to load. Here is a command-line session: $ ruby -v ruby 1.9.1p378 (2010-01-10 revision 26273) [i486-linux] $ gem env RubyGems Environment: - RUBYGEMS VERSION: 1.3.6 - RUBY VERSION: 1.9.1 (2010-01-10 patchlevel 378) [i486-linux] - INSTALLATION DIRECTORY: /usr/lib/ruby1.9.1/gems/1.9.1 - RUBY EXECUTABLE: /usr/bin/ruby1.9.1 - EXECUTABLE DIRECTORY: /usr/bin - RUBYGEMS PLATFORMS: - ruby - x86-linux - GEM PATHS: - /usr/lib/ruby1.9.1/gems/1.9.1 - /home/corey/.gem/ruby/1.9.1 - GEM CONFIGURATION: - :update_sources => true - :verbose => true - :benchmark => false - :backtrace => false - :bulk_threshold => 1000 - REMOTE SOURCES: - http://rubygems.org/ $ echo $PATH /home/corey/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/home/corey/.gem/ruby/1.9.1:/usr/lib/ruby1.9.1/gems/1.9.1 $ gem list -d nokogiri `*** LOCAL GEMS ***` nokogiri (1.4.1) Authors: Aaron Patterson, Mike Dalessio Rubyforge: http://rubyforge.org/projects/nokogiri Homepage: http://nokogiri.org Installed at: /usr/lib/ruby1.9.1/gems/1.9.1 Nokogiri (?) is an HTML, XML, SAX, and Reader parser $ ruby -r rubygems -e "require 'nokogiri'" -e:1:in `require': no such file to load -- nokogiri (LoadError) from -e:1:in `' I've encountered similar problems on Ubuntu before, but they were easy to fix. I can't figure out what's wrong in this particular case, and Google didn't seem to know either. Any help would be greatly appreciated! By the way... this is my first submission to stackoverflow. I hope this question is relevant. :)

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• Why is Routes.rb not loading the IPs from cache?

  - by Christian Fazzini

  I am testing this in local. My ip is 127.0.0.1. The ip_permissions table, is empty. When I browse the site, everything works as expected. Now, I want to simulate browsing the site with a banned IP. So I add the IP into the ip_permissions table via: IpPermission.create!(:ip => '127.0.0.1', :note => 'foobar', :category => 'blacklist') In Rails console, I clear the cache via; Rails.cache.clear. I browse the site. I don't get sent to pages#blacklist. If I restart the server. And browse the site, then I get sent to pages#blacklist. Why do I need to restart the server every time the ip_permissions table is updated? Shouldn't it fetch it based on cache? Routes look like: class BlacklistConstraint def initialize @blacklist = IpPermission.blacklist end def matches?(request) @blacklist.map { |b| b.ip }.include? request.remote_ip end end Foobar::Application.routes.draw do match '/(*path)' => 'pages#blacklist', :constraints => BlacklistConstraint.new .... end My model looks like: class IpPermission < ActiveRecord::Base validates_presence_of :ip, :note, :category validates_uniqueness_of :ip, :scope => [:category] validates :category, :inclusion => { :in => ['whitelist', 'blacklist'] } def self.whitelist Rails.cache.fetch('whitelist', :expires_in => 1.month) { self.where(:category => 'whitelist').all } end def self.blacklist Rails.cache.fetch('blacklist', :expires_in => 1.month) { self.where(:category => 'blacklist').all } end end

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• Ruby 1.8.7 compatibility

  - by Sebastian

  I had a exception when I switch to Ruby 1.8.7 on Snow Leopard ArgumentError: wrong number of arguments (1 for 0) /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/connection_adapters/abstract/quoting.rb:27:in 'to_s' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/connection_adapters/abstract/quoting.rb:27:in 'quote' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/connection_adapters/mysql_adapter.rb:190:in 'quote' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/base.rb:2042:in 'quote_value' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/base.rb:2034:in 'attributes_with_quotes' Application uses Rails 1.2.5: there is no chance to update rails in this app. Somebody have solution?

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• ruby gem not found although it is installed

  - by Eimantas

  I found some similar problems here on SO, but none seem to match my case (sorry if I overlooked). Here's my problem: I installed oauth-plugin gem to ruby gems dir, but trying to use it in rails app tells me that it's not being found. Here's the output of relevant commands: Instalation % s gem install oauth-plugin Successfully installed oauth-plugin-0.3.14 1 gem installed Installing ri documentation for oauth-plugin-0.3.14... Installing RDoc documentation for oauth-plugin-0.3.14... gem which oauth-plugin output: % gem which oauth-plugin /usr/lib/ruby/gems/1.8/gems/oauth-plugin-0.3.14/lib/oauth-plugin.rb gem env output: % gem env RubyGems Environment: - RUBYGEMS VERSION: 1.3.6 - RUBY VERSION: 1.8.7 (2009-12-24 patchlevel 248) [i686-darwin10.2.0] - INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.8 - RUBY EXECUTABLE: /usr/bin/ruby - EXECUTABLE DIRECTORY: /usr/bin - RUBYGEMS PLATFORMS: - ruby - x86-darwin-10 - GEM PATHS: - /usr/lib/ruby/gems/1.8 - /Users/eimantas/.gem/ruby/1.8 - GEM CONFIGURATION: - :update_sources => true - :verbose => true - :benchmark => false - :backtrace => true - :bulk_threshold => 1000 - :gem => ["--no-ri", "--no-rdoc"] - :sources => ["http://gems.ruby.lt/", "http://rubygems.org/"] - REMOTE SOURCES: - http://gems.ruby.lt/ - http://rubygems.org/ Doing ls -l /usr/lib/ruby shows this: % ls -l /usr/lib/ruby lrwxr-xr-x 1 root wheel 76 Aug 14 2009 /usr/lib/ruby -> ../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/lib/ruby And the gem in question is in intended location. This is not a single gem that is not being found by rubygems (although it's located where it should be). Any guidance towards the solution is much appreciated.

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• Installing Ruby Gems behind a Proxy

  - by jjr2527

  It appears this topic has been covered a few times before, but those solutions have only gotten me so far. I now have my sources properly updated and I am able to query for gems without an error but I keep getting empty results for my searches. I installed rubysspi and copied over the spa.rb file as mentioned in the readme. The readme also suggested using this line which did not work for me based on my install path: ruby -rspa 'C:\Program Files\ruby\gem' list --remote sspi So I switched it to my install directory off the root: ruby -rspa 'C:\ruby\gem' list --remote sspi But that also didn't work so a search for the gem file located it in the bin directory so this command finally worked for me: ruby -rspa 'C:\ruby\bin\gem' list --remote sspi But I got empty results back: *** REMOTE GEMS *** SO I tried other gems and had the same results. Then I listed my gem sources and rubygems is listed as expected. Am I missing something else? c:\ruby>gem sources *** CURRENT SOURCES *** http://rubygems.org

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• Rail 3 custom renderer: where do put this code?

  - by Derick Bailey

  I'm following along with Yehuda's example on how to build a custom renderer for Rails 3, according to this post: http://www.engineyard.com/blog/2010/render-options-in-rails-3/ I've got my code working, but I'm having a hard time figuring out where this code should live. Right now, I've got my code stuck right inside of my controller file. Doing this, everything works. When I move the code to the lib folder, though, I have explicitly 'require' my file in the controller that needs the renderer or it won't work. Yes, the file gets loaded when it sits in the lib folder, automatically. but the code to add the renderer isn't working for some reason, until I do a require on it. where should I put my code to add the renderer and mime type, so that rails 3 will pick it up and register it for me, without me having to manually require the file in my controller?

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• "Options ExecCGI is off in this directory" When try to run Ruby code using mod_ruby

  - by Itay Moav

  I am on Ubuntu, Apache 2.2 Installed the fcgi via apt-get then removed it via apt-get remove. Installed mod-ruby configuration I added to Apache: LoadModule ruby_module /usr/lib/apache2/modules/mod_ruby.so RubyRequire apache/ruby-run <Directory /var/www> Options +ExecCGI </Directory> <Files *.rb> SetHandler ruby-object RubyHandler Apache::RubyRun.instance </Files> <Files *.rbx> SetHandler ruby-object RubyHandler Apache::RubyRun.instance </Files> I have a file in the www direcoty with puts 'baba' I have other files in that directory, all accessible via Apache. Test file has been chmod 777 In the browser I get 403. In Apache error log I get: [error] access to /var/www/t.rb failed for (null), reason: Options ExecCGI is off in this directory If I move this to a sub folder rubytest and modify the relevant config to be: <Directory /var/www/rubytest> Options +ExecCGI </Directory> and making sure the directory has 755 permissions on it, it just try to download the file, as if it does not recognize the postfix *.rb any more If I give directory and files 777 it fails: usr/lib/ruby/1.8/apache/ruby-run.rb:53: warning: Insecure world writable dir /var/www/rubytest in LOAD_PATH, mode 040777 [Tue May 24 19:39:58 2011] [error] mod_ruby: error in ruby [Tue May 24 19:39:58 2011] [error] mod_ruby: /usr/lib/ruby/1.8/apache/ruby-run.rb:53:in load': loading from unsafe file /var/www/rubytest/t.rb (SecurityError) [Tue May 24 19:39:58 2011] [error] mod_ruby: from /usr/lib/ruby/1.8/apache/ruby-run.rb:53:in handler' BUT, IF I USE *.rbx it works like a charm...go figure.

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• Fundamental programming book [closed]

  - by Luke Annison

  I'm a fairly new programmer and currently learning ruby on rails with the intention of developing a web application. I am currently going reading Agile Web Development with Rails 4th Edition and its working well for me, however I'm wondering if somebody can recommend a more general, almost classic book to read casually alongside to help cement the fundamentals in place. As I said, I'm for the most part a beginner and the only education I've had is this and briefly one other technical book, so I'm sure there must be some "must reads" out there that give me a more substantial context for the basics of either Ruby on Rails, Ruby, objective oriented programming, or programming in general. What books helped you grasp a deeper and more rounded understanding of your skills as a programmer? All suggestions are welcome and appreciated.

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• Ruby JSON.pretty_generate ... is pretty unpretty

  - by Amy

  I can't seem to get JSON.pretty_generate() to actually generate pretty output in Rails. I'm using Rails 2.3.5 and it seems to automatically load the JSON gem. Awesome. While using script/console this does indeed produce JSON: some_data = {'foo' => 1, 'bar' => 20, 'cow' => [1, 2, 3, 4], 'moo' => {'dog' => 'woof', 'cat' => 'meow'}} some_data.to_json => "{\"cow\":[1,2,3,4],\"moo\":{\"cat\":\"meow\",\"dog\":\"woof\"},\"foo\":1,\"bar\":20}" But this doesn't produce pretty output: JSON.pretty_generate(some_data) => "{\"cow\":[1,2,3,4],\"moo\":{\"cat\":\"meow\",\"dog\":\"woof\"},\"foo\":1,\"bar\":20}" The only way I've found to generate it is to use irb and to load the Pure version: require 'rubygems' require 'json/pure' some_data = {'foo' => 1, 'bar' => 20, 'cow' => [1, 2, 3, 4], 'moo' => {'dog' => 'woof', 'cat' => 'meow'}} JSON.pretty_generate(some_data) => "{\n \"cow\": [\n 1,\n 2,\n 3,\n 4\n ],\n \"moo\": {\n \"cat\": \"meow\",\n \"dog\": \"woof\"\n },\n \"foo\": 1,\n \"bar\": 20\n}" BUT, what I really want is Rails to produce this. Does anyone have any tips why I can't get the generator in Rails to work correctly? Thanks! Updated 5:20 PM PST: Corrected the output.

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• Working with a large data object between ruby processes

  - by Gdeglin

  I have a Ruby hash that reaches approximately 10 megabytes if written to a file using Marshal.dump. After gzip compression it is approximately 500 kilobytes. Iterating through and altering this hash is very fast in ruby (fractions of a millisecond). Even copying it is extremely fast. The problem is that I need to share the data in this hash between Ruby on Rails processes. In order to do this using the Rails cache (file_store or memcached) I need to Marshal.dump the file first, however this incurs a 1000 millisecond delay when serializing the file and a 400 millisecond delay when serializing it. Ideally I would want to be able to save and load this hash from each process in under 100 milliseconds. One idea is to spawn a new Ruby process to hold this hash that provides an API to the other processes to modify or process the data within it, but I want to avoid doing this unless I'm certain that there are no other ways to share this object quickly. Is there a way I can more directly share this hash between processes without needing to serialize or deserialize it? Here is the code I'm using to generate a hash similar to the one I'm working with: @a = [] 0.upto(500) do |r| @a[r] = [] 0.upto(10_000) do |c| if rand(10) == 0 @a[r][c] = 1 # 10% chance of being 1 else @a[r][c] = 0 end end end @c = Marshal.dump(@a) # 1000 milliseconds Marshal.load(@c) # 400 milliseconds Update: Since my original question did not receive many responses, I'm assuming there's no solution as easy as I would have hoped. Presently I'm considering two options: Create a Sinatra application to store this hash with an API to modify/access it. Create a C application to do the same as #1, but a lot faster. The scope of my problem has increased such that the hash may be larger than my original example. So #2 may be necessary. But I have no idea where to start in terms of writing a C application that exposes an appropriate API. A good walkthrough through how best to implement #1 or #2 may receive best answer credit.

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• Sharing large objects between ruby processes without a performance hit

  - by Gdeglin

  I have a Ruby hash that reaches approximately 10 megabytes if written to a file using Marshal.dump. After gzip compression it is approximately 500 kilobytes. Iterating through and altering this hash is very fast in ruby (fractions of a millisecond). Even copying it is extremely fast. The problem is that I need to share the data in this hash between Ruby on Rails processes. In order to do this using the Rails cache (file_store or memcached) I need to Marshal.dump the file first, however this incurs a 1000 millisecond delay when serializing the file and a 400 millisecond delay when serializing it. Ideally I would want to be able to save and load this hash from each process in under 100 milliseconds. One idea is to spawn a new Ruby process to hold this hash that provides an API to the other processes to modify or process the data within it, but I want to avoid doing this unless I'm certain that there are no other ways to share this object quickly. Is there a way I can more directly share this hash between processes without needing to serialize or deserialize it? Here is the code I'm using to generate a hash similar to the one I'm working with: @a = [] 0.upto(500) do |r| @a[r] = [] 0.upto(10_000) do |c| if rand(10) == 0 @a[r][c] = 1 # 10% chance of being 1 else @a[r][c] = 0 end end end @c = Marshal.dump(@a) # 1000 milliseconds Marshal.load(@c) # 400 milliseconds

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• Wrong Ruby Float and BigDecimal subtraction result

  - by SamChandra

  I am running: [~/ruby/rails/sas]$ ruby --version ruby 1.8.7 (2009-06-08 patchlevel 173) [universal-darwin10.0] on Mac Snow Leopard 10.6.3 Can anyone help to explain why the Float and BigDecimal subtraction can be this wrong. [~/ruby/rails/sas]$ console Loading development environment (Rails 2.1.1) >> num = 30.0 => 30.0 >> num.class => Float >> ex = 28.04.to_d => #<BigDecimal:105367e40,'0.284E2',8(8)> >> ex.class => BigDecimal >> num - ex => 1.6 >> _.class => Float >> I was hoping that the result should be 1.96, I know that perhaps doing an arithmetic operation using 2 different data types are not recommended, but this behavior is so strange. It seems to be wise that from now on, I have to check the variables data type before doing any arithmetic operation. Hopefully somebody can give me an insight on what was happening.

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• Load Ruby on Rails models without loading the entire framework

  - by epochwolf

  I'm looking to create a custom daemon that will run various database tasks such as delaying mailings and user notifications (each notice is a separate row in the notifications table). I don't want to use script/runner or rake to do these tasks because it is possible that some of the tasks only require the create of one or two database rows or thousands of rows depending on the task. I don't want the overhead of launching a ruby process or loading the entire rails framework for each operation. I plan to keep this daemon in memory full time. To create this daemon I would like to use my models from my ruby on rails application. I have a number of rails plugins such as acts_as_tree and AASM that I will need loaded if I where to use the models. Some of the plugins I need to load are custom hacks on ActiveRecord::Base that I've created. (I am willing to accept removing or recoding some of the plugins if they need components from other parts of rails.) My questions are Is this a good idea? And - Is this possible to do in a way that doesn't have me manually including each file in my models and plugins? If not a good idea What is a good alternative? (I am not apposed to doing writing my own SQL queries but I would have to add database constraints and a separate user for the daemon to prevent any stupid accidents. Given my lack of familiarity with configuring a database, I would like to use active record as a crutch.)

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• Text editor(FCKEditor) ruby on rails/ PHP

  - by Steven

  I have an application that is running on Rials so now I want to add the text editor(FCKEditor/TinyMCE) to adit text/uploading images on website. I have google the internet until I got FCKeditor for Rails(http://rubyforge.org/projects/fckeditorp/) "which has a function of uploading pictures but ones you uploaded the images you can't delete/rename them :( " I tried to look for another solution and I got another FCKEditor - Ajax File Manager plugin for PHP(it works fine on my Rails Application) but the problem is I need some information from rails to use it in php e.g: session for the current login user. 1.) is there anyone got an Idea on how to get those Ruby sessions in php script? 2.) I looked at saving it in javascript session and access it in php via javascript cause both can talk to Javascript. 3.) or is there any Rails text editor which has a functionality of uploading/deleting the images? 4.) Or any better way of doing this... cause the only thing I need is the text editor that will allow me to uploaded/delete images NOt via the url but the one that will save the images on the server. Steven

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• Missing Required Gems - javan-whenever and cron job in rails

  - by Matenia Rossides

  Hi, I have finally managed to get javan-whenever gem working on my site5 server, and updating the crontab is quite easy, however whenever a cron job is run with the code that is generated, i get a "missing required gems" error where it lists about 8/10 of my gems. Has anyone else had this problem? If so, what would the solution be. The funny thing is that when it outputs where my gems are, this is all correct, and the gems are loading fine from within my application. Cheers, Matenia

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• Twitter gem - undefined method `stringify_keys’

  - by Piet

  Have you been getting the following errors when running the Twitter gem lately ? /usr/local/lib/ruby/gems/1.8/gems/httparty-0.4.3/lib/httparty/response.rb:15:in `send': undefined method `stringify_keys' for # (NoMethodError) from /usr/local/lib/ruby/gems/1.8/gems/httparty-0.4.3/lib/httparty/response.rb:15:in `method_missing’ from /usr/local/lib/ruby/gems/1.8/gems/mash-0.0.3/lib/mash.rb:131:in `deep_update’ from /usr/local/lib/ruby/gems/1.8/gems/mash-0.0.3/lib/mash.rb:50:in `initialize’ from /usr/local/lib/ruby/gems/1.8/gems/twitter-0.6.13/lib/twitter/search.rb:101:in `new’ from /usr/local/lib/ruby/gems/1.8/gems/twitter-0.6.13/lib/twitter/search.rb:101:in `fetch’ from test.rb:26 It’s because Twitter has been sending back plain text errors that are treated as a string instead of json and can’t be properly ‘Mashed’ by the Twitter gem. Also check http://github.com/jnunemaker/twitter/issues#issue/6. Without diving into the bowels of the Twitter gem or HTTParty, you could ‘begin…rescue’ this error and try again in 5 minutes. I fixed it by overriding the offending code to return nil and checking for a nil response as follows: module Twitter class Search def fetch(force=false) if @fetch.nil? || force query = @query.dup query[:q] = query[:q].join(' ') query[:format] = 'json' #This line is the hack and whole reason we're monkey-patching at all. response = self.class.get('http://search.twitter.com/search', :query => query, :format => :json) #Our patch: response should be a Hash. If it isnt, return nil. return nil if response.class != Hash @fetch = Mash.new(response) end @fetch end end end (adapted from http://github.com/jnunemaker/twitter/issues#issue/9) If you have a better solution: speak up!

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• Project Euler 53: Ruby

  - by Ben Griswold

  In my attempt to learn Ruby out in the open, here’s my solution for Project Euler Problem 53.  I first attempted to solve this problem using the Ruby combinations libraries. That didn’t work out so well. With a second look at the problem, the provided formula ended up being just the thing to solve the problem effectively. As always, any feedback is welcome. # Euler 53 # http://projecteuler.net/index.php?section=problems&id=53 # There are exactly ten ways of selecting three from five, # 12345: 123, 124, 125, 134, 135, 145, 234, 235, 245, # and 345 # In combinatorics, we use the notation, 5C3 = 10. # In general, # # nCr = n! / r!(n-r)!,where r <= n, # n! = n(n1)...321, and 0! = 1. # # It is not until n = 23, that a value exceeds # one-million: 23C10 = 1144066. # In general: nCr # How many, not necessarily distinct, values of nCr, # for 1 <= n <= 100, are greater than one-million timer_start = Time.now # There's no factorial method in Ruby, I guess. class Integer # http://rosettacode.org/wiki/Factorial#Ruby def factorial (1..self).reduce(1, :*) end end def combinations(n, r) n.factorial / (r.factorial * (n-r).factorial) end answer = 0 100.downto(3) do |c| (2).upto(c-1) { |r| answer += 1 if combinations(c, r) > 1_000_000 } end puts answer puts "Elapsed Time: #{(Time.now - timer_start)*1000} milliseconds"

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• Introducing Kiddo: A Ruby DSL for building simple WPF and Silverlight applications

  - by fdumlao

  Read the original article here... As a long time Ruby lover and deep rooted .NET supporter, I was probably more psyched than anyone I knew when IronRuby 1.0 was finally released. I immediately grabbed and started building some apps with it to see where the boundaries were going to lie between IronRuby and ruby.exe, and so far I've been pleasantly surprised by how many things just work as I'd expect. I then started to try out some of my favorite libs that I was sure would not work with IronRuby, and I wasn't surprised at all when _why's amazing Shoes library didn't work. Being somewhat familiar with Shoes (it's a great DSL for building simple UIs in Ruby) I felt it wouldn't be that difficult to port it over and as it turned out, someone else had already started the work. As cool as this was, I was never quite satisfied with good 'ol shoes. While it was quite complete, it lacked simple extensibility points, and although easy, it wasn't quite "kid friendly". At the same time on the .NET side of the fence, IronRuby could easily compile XAML to create WPF and Silverlight UIs, but trying to do it declaratively in plain Ruby was no fun at all. And so, the Shoes-inspired, WPF/Silverlight GUI DSL was born. (and it lives here: http://bitbucket.org/fdumlao/kiddo/src) Introducing Kiddo Tell you what. Let's start with a quick code example first. We'll build a useful app that we can use to quickly reverse strings whenever we need it. Read the complete article here...

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• Ruby or Python?

  - by Bobby Tables

  Hi all, This question is extremely subjective and open-ended. It might even sound like something I should just research for myself and make my own decision. But I'd like to put it out there and get some thoughts from others. Long story short - I burned out with the rat race and am on a self-funded sabbatical this year. Much of it is to take a break from the corporate grind and travel around, but I also want to play around with new technologies and do some self-learning projects, to stay up to speed on programming, and well - I just love tinkering with programming, when there's no pressure! Here's the thing: I am a lifetime C/C++/Java programmer. I'm a bit of a squiggly bracket snob since I've been working with this family of languages for my entire programming career. So I'd like to learn a language which isn't so closely syntactically related to this group. What I'm basically looking for is a language which is relatively general purpose, fun to learn, has some new concepts that are different from C++/Java, and has a good community. A secondary consideration is that it has good web development frameworks. A tertiary consideration is that it's not totally academic (read: there are real world jobs out there using it). I've narrowed it down to Ruby or Python. My impression of Ruby is that it is extremely web oriented - that the only real application of it is as a server side scripting language for doing web stuff (mainly Ruby on Rails). For Python I'm not so sure. TL;DR and to put it as succinctly as possible: which of these would be better for a C++/Java guy to learn to get some new perspectives on programming? And which is more open and general purpose and applicable to a wider set of applications? I'm leaning towards Ruby at the moment, but I worry to an extent that it looks like it's used as nothing but a server side web language.

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• Ruby workflow in Windows

  - by Rig

  I've done some searching and quite haven't come across the answer I am looking for. I do not think this is a duplicate of this question. I believe Windows could be a suitable development environment based on the mix of answers in that question. I have been developing in Ruby (mostly Rails but not entirely) for about a year now for personal projects on a Macbook Pro however that machine has faced an untimely death and has been replaced with a nice Windows 7 machine. Ruby development felt almost natural on the Mac after doing some research and setting up the typical stack. My environment then included the standard (Linux like) stuff built into OSX, Text Wrangler, Git, RVM, et al. Not too much of a deviation from what the 'devotees' tend to assume. Now I am setting up my new Windows box for continuing that development. What would my development environment look like? Should I just cave and run Linux in a VM? Ideally I would develop in Windows native. I am aware of the Windows Ruby installer. It seems decent but its not exactly as nice as RVM in the osx/linux world. Mercurial/Git are available so I would assume they play into the stack. Does one develop entirely in Windows? Does one run a webserver in a Linux VM and use it as a test bed while developing in Windows? Do it all in a VM? What does the standard Windows Ruby developer environment look like and what is the workflow? What would a typical step through be for adding a new feature to an ongoing project and what would the technology stack look like?

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• Using JSON input in Ruby method on Rails

  - by Zachary

  I am using jQuery to make an AJAX call to a ruby method in my controller. The javascript looks something like this: var latLongJSON = { "address": [ {"lat" : 50, "long" : 50} ] }; var returnedAddresses; $.ajax({ type: "GET", data: latLongJSON, url: "map/getaddresses", success: function(data) { returnedAddresses = JSON.parse(data); } }); Then in my 'getaddresses' method, my parameter coming through looks like: Parameters: {"address"=>"[object Object]"} I'm not sure what to do with this. I'm fairly new to Ruby, and I'm not sure if I need to convert this to something else, or what. Ideally I want to be able to pass in multiple sets of lat/long in the 'address' array, then be able to iterate over those in my Ruby code.

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• Generating Google Maps markers using Ruby

  - by ischnura

  I would like to do a very simple task: add some markers in a Google Map using a list of addresses from an array. I have been thinking about generating the Google Maps JavaScript API code using ruby (printf) but this does not seem like a very clean and beautiful solution... I have read about YM4R for Ruby on Rails... my project is pretty simple and I have never worked with Ruby on Rails... I have also never used JQuerry... but I am very willing to learn to use this tools :) What do you think will be the best approach to generating the markers?

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• Rails: simple bundler question with ruby-openid

  - by Joern Akkermann

  Hi! I just installed the ruby-openid gem and then bundled it by entering gem 'ruby-openid', :require => 'openid' in the gemfile. Then I started bundle install and bundle lock. Everything worked fine so far. But how can I now access the classes of ruby-openid. OpenID::method won't work for me. It raises a not found error. What have I forgot or done wrong? I'm absolutely new to bundler and the internet full of solutions for various versions, but I need one solution that's surely working. I'm thankful for any help!

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• Most useful Rails plugins, Ruby libraries and Ruby gems?

  - by Srinivas Iyer

  I have seen many sites which provide the whole list of Rails plugins, Ruby libraries and Ruby gems, but we hardly use few of them and some may not suit our requirement and we spend a whole lot of time searching for useful plugins which suits our requirement. I have created this poll, people can post useful libraries, gems and plugins which they have come across. It would be great help for newbies like me and to the entire Ruby on Rails community. Note: to keep this poll as useful as possible, please remember: Post only one library, gem, or plugin per answer Mention the name of the library, gem, or plugin which you find it useful. URL of the location of the resource We don't want duplicate answers, so before posting check if the library has been mentioned already. Thanks

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