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• Tracking fitness in a genetic algorithm

  - by Chuck Vose

  I'm still hacking on my old ruby for the undead post (I know, I know, stop trying to bring the post back from the dead Chuck). But the code has gotten a little out of hand and now I'm working on a genetic algorithm to create the ultimate battle of living and dead with the fitness being how long the battle lasts. So, I've got the basics of it down; how to adjust attributes of the game and how to acquire the fitness of a solution, what I can't figure out is how to store the fitness so that I know when I've tried a combination before. I've not been able to find much genetic code to look at let alone code that I can read well enough to tell what's going on. Does anyone have an idea how this is normally done or just simply an algorithm that could help point me in the right direction?

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• Yahoo authentication

  - by steve

  Hi - I'm playing around with the new yahoo API. I'd like to scrap some dummy data using the following address http://query.yahooapis.com/v1/public/yql?q=desc%20social.updates.search&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=cbfunc When I run this I get an authenticaion error (Need to be logged into Yahoo) This is fine obviously for me messing around on the internet. However I'd like to call this from a ruby script. Any ideas how I go about authenticating? I can only seem to find some web enabled version.

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• Web framework for an application utilizing existing database?

  - by tputkonen

  A legacy web application written using PHP and utilizing MySql database needs to be rewritten completely. However, the existing database structure must not be changed at all. I'm looking for suggestions on which framework would be most suitable for this task? Language candidates are Python, PHP, Ruby and Java. According to many sources it might be challenging to utilize rails effectively with existing database. Also I have not found a way to automatically generate models out of the database. With Django it's very easy to generate models automatically. However I'd appreciate first hand experience on its suitability to work with legacy DBs. Also I appreciate suggestions of other frameworks worth considering.

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• Using RVM with GVim (Cream): rvm command not found.

  - by Alan Peabody

  I am trying to move to GVim(cream) as my primary editor on Ubuntu. I am using the wonderful rails.vim, however I also am using RVM. Rvm works fine when doing things in a shell, and the ruby version I would like to use in rails.vim is the version set as default (but not the system version). When I try to run things like :Rgenerate migration migration_name I get: ... Missing Rails 2.3.8 gem. ... If I try: :!rvm use default I get: /bin/bash: rvm: command not found Obviously cream is not using my bash profile. What can I do to remedy this and get it working? Thanks.

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• Jquery JCarousel, itemLastInCallback how to change out the controls

  - by TJ Sherrill

  I am new to js and Jquery other than plug and play scripts and plugins. I have Jcarousel running great on a Ruby on Rails site and I need to use the itemLastInCallback method to change out the next and prev buttons. Basically if the end user clicks through to the last item in a carousel, the next button would become a link to the next carousel. <%= link_to (image_tag 'scroll_right.png'), @next_group % is the code I need to render in the end. So something like: if this is not the last item in the carousel button is normal jcarousel next button else <%= link_to (image_tag 'scroll_right.png'), @next_group % end is there a best way to do this? am I on the right track?

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• Updating RubyGems alongside an existing packaged installation on Joyent

  - by Matt

  On a Joyent accelerator I'm working with, Ruby and Rubygems were installed when the server was initially setup using Cool Stack. The existing version of Rubygems is version 0.9.2. When it comes to upgrading RubyGems using the 'sudo gem install rubygems-update' and 'sudo update_rubygems' commands, it results in the following error: ./lib/rubygems.rb:124: uninitialized constant Gem::RbConfig (NameError) from setup.rb:24:in `require' from setup.rb:24 Without having much success in rectifying this issue, I wanted to install a fresh version of RubyGems alongside this one. As this is a production server, I want to minimize the amount of environment changes I make on the server. If I install a fresh version of RubyGems from source, how do I set this new installed version of RubyGems as the default version of RubyGems to use?

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• Is it possible to filter by conditions before paginating?

  - by Brian Roisentul

  I'm using ruby on rails 2.3.8 and will_paginate plugin. I've just noticed that if I write something like this: Announcement.paginate :page => params[:page], :per_page => 10, :conditions => some_condition it will work. But, if I write something like this: announcements = Announcement.all :conditions => some_condition @ann = announcements.paginate :page => params[:page], :per_page => 10 it won't recognize conditions. Maybe you're wondering "why would he want to do that?", well, it's a long story and I really need to first filter the conditions and then paginate the results.

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• How to embed multiple tags in Rails routes, like Stackoverflow.

  - by Craig

  When one selects a Tag on stackoverflow, it is added to the end of the Url. Add a second Tag and it is add to the end of the Url after the first Tag, with a '+' delimiter. For example, http://stackoverflow.com/questions/tagged/ruby-on-rails+best-practices. How is this implemented? Is this a routing enhancement or some logic contained in the TagsController? Finally, how does one 'extract' these Tags for filtering (assuming that they are not in the params[] array)?

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• Datamapper has n relationship with multiple keys

  - by jing

  I am working on a simple relationship with DataMapper, a ruby webapp to track games. A game belongs_to 4 players, and each player can have many games. When I call player.games.size, I seem to be getting back a result of 0, for players that I know have games associated with them. I am currently able to pull the player associations off of game, but can't figure out why player.games is empty. Do I need to define a parent_key on the has n association, or is there something else I'm missing? class Game belongs_to :t1_p1, :class_name => 'Player', :child_key => [:player1_id] belongs_to :t1_p2, :class_name => 'Player', :child_key => [:player2_id] belongs_to :t2_p1, :class_name => 'Player', :child_key => [:player3_id] belongs_to :t2_p2, :class_name => 'Player', :child_key => [:player4_id] ... end class Player has n, :games ... end

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• Showing all a Gem's build flags

  - by Rob

  This is more a curiosity than necessity question. I've just installed nokogiri again with RubyGems and it is saying "WARNING: Nokogiri was built against LibXML version 2.7.5, but has dynamically loaded 2.7.6" This is easy enough to fix, but it lead to a more general question: how do I see all the configuration options for a rubygem before installing it? I found the easiest way I know how is to visit the gem folder an run "ruby nokogiri-0.0.0/ext/nokogiri/extconf.rb -h" and that shows me it, but there has to be an easier way, right? I was expecting some kind of "sudo gem install nokogiri -- --help" command that would show the build flags. I've searched around a bit but didn't see anything, anybody know how to do this before I go digging into RG's source :)?

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• What technologies should I focus on to work as a developer in Japan?

  - by Atomiton

  I'm thinking of one day moving to Japan and I was wondering if anyone here has any experience working there. I'm curious as to what languages/technology are popular there for web development and software development. I have heard Ruby is/was strong there due to its founder being Japanese. What would you recommend someone focus on if they wanted to work as a developer in Japan? I have heard Microsoft has a strong base in Japan, but my guess is that whatever platform has supported unicode or Shift-JIS the best would be the strongest.

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• Languages and development methodologies

  - by Carlos

  Having never worked with Ruby on Rails, I looked it up on Wikipedia. It says It is intended to be used with an Agile development methodology that is used by web developers for rapid development. This got me asking how a given language/framework can be more appropriate for given development methodologies. Are there certain languages that are more friendly for pair programming, for instance? Are there language features that make certain methodologies are more appropriate? Are there features that make certain methodologies impossible? My initial reaction is to dismiss the connection (the design process is a business process, which is more dependent on business needs that language features). But I'm an only programmer within the firm, and I'm a partner, so I get to decide the business needs. What do you think? Also, if the SO community finds that certain languages point towards certain methodologies, what methodology is most common for c#, which is what I use most of the time?

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• Extend RedCloth via Redmine plugin?

  - by FLX

  Hello, I'm new to Ruby/Redmine/Redcloth but I'm trying to achieve the following: The default way to build a link in Textile is "foo":http://bar. However, 90% of the day I use Atlassian products, which use [foo|http://bar] as link markup. To keep everything a bit uniform I'd like to implement this in Redmine via a plugin. However, it appears that you can't change the macro syntax so instead I'll have to look into extending RedCloth to accept this form of inserting links. Does anyone know how I can achieve this? Thank you and merry christmas, Dennis

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• Problem serving video to iPad from Mongrel 1.1.5 , RoR 2.0.2 on Mac OS 10.6.3 Server

  - by reggieunderground

  I am working off the Final Cut Server Integration sample provided by Apple that is a Rails app using 2.0.2 and runs on Mongrel 1.1.5. I can have a basic non-Ruby directory on my boot volume (Mac OS 10.6.3 Server) and can serve up video files just fine to iPad. However, when I drag the same video file into the 'public' area of the app running on -p 3000 it will not play on iPad, but will in Safari 4.0.5 desktop version. Images work fine so I know it's not a permissions issue. I'm getting the crossed-out play icon on iPad so it is not an issue of waiting on a large file to download before playing. I suspect it is a Mongrel/Snow Leopard issue but why would Safari on desktop work fine and not Safari iPad? FYI, Integration Sample is at bottom of page: http://www.apple.com/finalcutserver/resources/ Any help is very much appreciated, Reggie

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• Passing data with Rails' link_to helper

  - by mathee

  I am implementing a question-and-answer application with Ruby on Rails. I have MVCs for Questions and Answers. In the home view (index.haml), I list the Questions like this: - @questions.each do |q| %tr %td =link_to q.title, q Next to each of those, I want to add a link that will create a new Answer and pass the id of the Question in that row (continued from the above Haml code) : %td #{link_to 'answer me!', new_answer_path, pass q.id here somehow?} I don't know how to properly pass it and then access it in AnswersController. I tried #{link_to 'answer me!', new_answer_path, :question_id => q.id}, but that was just a guess, and I don't know how to access that in AnswersController. I read the Rails API docs, and I know you can add query, too, but I still don't know how to access the value in AnswersController.

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• Create a thumbnail of a dwg in in a linux environment

  - by Kyle

  Creating a ruby on rails site that uses RMagick to create thumbnails for many types of images. RMagick cannot read dwg files however. I've tried a few things, looked into the Java library JDWGLib, which would probably allow me to write a converter, but it would be a total from the ground up solution, where I just need a thumbnail. Also considered using a viewer program to open the file in a remote X session and do a screen capture, however I'm not sure how I could ever guarantee that the viewer had completed opening when I took the screenshot. I'm not concerned with being able to manipulate the file other than to create the thumbnail. It is going to be used for commercial purposes, so any libraries used need to be compatible.

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• How do I create many-one relationships using Scaffold?

  - by Simon

  I'm new to Ruby on Rails, and I'm trying to create a bass guitar tutor in order to teach myself RoR (and bass guitar). The walkthroughs use Scaffold to create ActiveRecord classes, but they seem to correspond to standalone tables; there's no use of belongs_to or has_many. I'd like to create three classes: Scale, GuitarString, and Fret. Each Scale has many GuitarStrings, which each have many Frets. How do I create classes with this relationship using Scaffold? Is there a way to do it in one go, or do I need to create them in an unrelated state using Scaffold, then add the relations by hand? Or should I ditch Scaffold entirely?

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• How to specify custom Sass directory with sinatra

  - by yaya3

  Instead of serving my Sass files from the default 'views' directory I'd like to change this to /assets/sass The following attempts are in my main ruby root file in the app: Attempt 1 set :sass, Proc.new { File.join(root, "assets/sass") } get '/stylesheet.css' do sass :core end With this I get the following error: myapp.rb:17 NoMethodError: undefined method `merge' for "/Users/x/x/x/mysinatraapp/assets/sass":String Attempt 2 get '/stylesheet.css' do sass :'/assets/sass/core' end Attempt 3 get '/stylesheet.css' do sass :'/assets/sass/core' end Both return the following error: Errno::ENOENT: No such file or directory - ./views/assets/sass/core.sass Attempt 4 get '/stylesheet.css' do sass :'../assets/sass/core' end This works! however, there must be something along the lines of set :sass, Proc.new { File.join(root, "assets/sass") } that sets this up for me?

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• Lazy loading of ESB in a jruby rails app

  - by brad

  I have a jruby/rails app using: jruby 1.4.0 Rails 2.3.5 ActiveMQ 5.3.0 Mule ESB 2.2.1 Currently in our environment.rb file we start up Mule in the initializer. This becomes a big pain when we go to do normal rake tasks that don't require JMS/Mule such as db:migrate as it takes a long time to startup/shutdown Mule everytime. The code is similar to this: APP_CONTEXT = Java::our.company.package.service_clients.Initializer.getAppContext(MULE_CONFIG_PATH) And we use APP_CONTEXT to fetch the bean to connect to the appropriate service. I'm trying to figure out some mechanism by which APP_CONTEXT could be lazily instantiated (not in initialize) to avoid all of the pains of having to startup Mule on initialize. Currently we have a few ruby client classes that are instantiated as a before_filter in application_controller such as @data_service = DataService.new(APP_CONTEXT) that initialize the proper java client for each request for use in our controllers. I'm open to all suggestions. I'm having a hard time trying to find the right place to put this lazy instantiation.

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• RubyQt Crashing on QTableWidget

  - by gja

  I'm getting some weirdness with QtRuby when using a TableWidget. The table widget loads, but when you click on the elements in the row, the app segfaults and crashes. require 'Qt4' class SimpleModel < Qt::AbstractTableModel def rowCount(parent) return 1 end def columnCount(parent) return 1 end def data(index, role=Qt::DisplayRole) return Qt::Variant.new("Really Long String") if index.row == 0 and index.column == 0 and role == Qt::DisplayRole return Qt::Variant.new end end Qt::Application.new(ARGV) do Qt::TableWidget.new(1, 1) do set_model SimpleModel.new show end exec end The backtrace seems to imply that it is bombing in mousePressEvent #6 0x01624643 in QAbstractItemView::pressed(QModelIndex const&) () from /usr/lib/libQtGui.so.4 #7 0x016306f5 in QAbstractItemView::mousePressEvent(QMouseEvent*) () from /usr/lib/libQtGui.so.4 If I override mousePressEvent and mouseMoveEvent, these kinds of crashes no longer happen. Am I doing something wrong over here, or can I chalk this up as a bug in QtRuby? I'm on fedora11, with the following packages installed: QtRuby-4.4.0-1.fc11.i586 ruby-1.8.6.369-1.fc11.i586 These crashes also happen when running the script on Windows.

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• No colors when using autospec

  - by kfitzpatrick

  When I'm using autospec to test a non-Rails Ruby project, I always have trouble getting my tests to show up red or green. When I run a regular 'spec spec/ --color' command I get normal red/green responses. I've tried putting all sorts of commands in the .autotest file and I can't get that to work. Also, in my Rails projects, I don't get this problem. Note: I do have the ZenTest(4.2.1) and redgreen (1.2.2) gems installed. I'm currently trying to get it working with this project: http://github.com/coreyhaines/kata-number-to-led

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• Liquid templates - accessing members by name

  - by egarcia

  I'm using Jekyll to create a new blog. It uses Liquid underneath. Jekyll defines certain "variables": site, content, page, post and paginator. These "variables" have several "members". For instance, post.date will return the date of a post, while post.url will return its url. My question is: can I access a variable's member using another variable as the member name? See the following example: {% if my_condition %} {% assign name = 'date' %} {% else %} {% assign name = 'url' %} {% endif %} I have a variable called name which is either 'date' or 'url'. How can I make the liquid equivalent of post[name] in ruby? The only way I've found is using a for loop to iterate over all the pairs (key-value) of post. Beware! It is quite horrible: {% for property in post %} {% if property[0] == name %} {{ property[1] }} {% endif %} {% endfor %} Argh! I hope there is a better way. Thanks.

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• Can't get access to PHPmyAdmin after setting a root password and using Instant Rails

  - by Derek

  Wanted to get started with Ruby on Rails so I installed instant rails and set up a mysql password. Problem is now I can't get access to phpmyadmin. From the rails control panel, when I go to configure database (via PhpMyadmin) it opens up phpmyadmin with the message Error MySQL said: Documentation #1045 - Access denied for user 'root'@'localhost' (using password: NO) When I used to use XAMPP after setting a password instead of taking me directly within phpmyadmin (as it did without a password) it took me to the login screen instead. With instant rails that's not the case. Anyone had this problem when they first set a mysql password and using the instant rails package?

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• Include FileUtils raises an error

  - by Bilal Aslam

  I am trying to install CruiseControl.rb on an Amazon EC2 instance. I get this error in the mongrel log: /data/cruisecontrol/releases/20100313003145/vendor/rails/activesupport/lib/active_support/dependencies.rb:105:in `const_missing': uninitialized constant ProjectsMigration::FileUtils (NameError) This error is raised in a file called projects_migration.rb: http://gist.github.com/331025. Check out line 3, which I have commented out. If you remove the comment-out, you will get this error as well. The weird part: from ruby script/console I can include FileUtils just fine!

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• Rub, regex, sentences

  - by Perello

  I'm currently building a code generator, which aim to generate boiler plate for me once i wrote the templates and/or translations, whatever the language i have to work with, and it has an educationnal part :p. So i have a problem with a regex in ruby. The regex aim to select whatever is between {{{ and }}}, so i can generae functions according to my needs. My regex is currently : /\{\{\{(([a-zA-Z]|\s)+)\}\}\}/m My test data set {{{Demande aaa}}} = {{{tagadatsouintsouin tutu}}} The results are : [["Demande aaa", "a"], ["tagadatsouintsouin tutu", "u"]] So the regex pick each time the last character twice. But, that's not exactly what i want, my need is more about this : /\{\{\{((\w|\W)+)\}\}\}/m But this as a flaw too, the results : [["Demande aaa}}} = {{{tagadatsouintsouin tutu", "u"]] Whereas, i wish to get [["Demande aaa"],["tagadatsouintsouin tutu"]] Any ideas to correct theses regex ? I could use 2 sets of delimiters, but it won't learn me anything.

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