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• Writing an app with Perl and Ruby?

  - by Jeff Erickson

  I am working on a project that is mostly Ruby on Rails. However, I need to generate and parse Excel files in this project (I know, I know...), so I've been using Perl's Spreadsheet::WriteExcel and Spreadsheet::ParseExcel which work well. However, what is the best way to combine this use of Perl with the larger Ruby on Rails app? Is calling the Perl script with backticks the kosher way to go about this? It feels a little hacky to me, but if that is the only (or best) way, then that's what I'll do. I wanted to reach out and see if anyone else has some suggestions or advise. Thank you!

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• Warbler: Where are my images

  - by user108031

  I'm using Jruby and Warbler to deploy a Jruby on Rails application to a Tomcat server. I can see all of my images when I deploy the server with Webrick: jruby -S server/script. However, when I create a .war file out of the rails directory using jruby -S warble and deploy to Tomcat, none of my images show up on the tomcat server. I noticed that image location has changed to the root of the directory in the war file. It seems that /images/picturename.jpg would be appropriate, but my images are not showing up.

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• NameError: uninitialized constant Nokogiri::HTML::DocumentFragment

  - by Mike Sutton

  About three hours ago I started seeing the above error in my production server. It comes from a call to the sanitize gem: vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:276:in 'load_missing_constant' vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:468:in `const_missing' vendor/gems/sanitize-1.2.0/lib/sanitize.rb:91:in `clean!' vendor/gems/sanitize-1.2.0/lib/sanitize.rb:84:in `clean' vendor/gems/sanitize-1.2.0/lib/sanitize.rb:49:in `clean' app/helpers/application_helper.rb:28:in `display_none' app/views/main/_blogs.html.erb:13:in `_run_erb_47app47views47main47_blogs46html46erb' The error only occurs on the production server (linux), not my development machine (windows) I tried rolling back my latest deployment but it didn't fix it. I've updated to sanitize 1.2.0 (which was the latest version brought down by gem update sanitize, though I note my host is running 1.3.6. Can anyone provide any clues to help fix this?

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• MongoMapper - undefined method `keys'

  - by nimnull

  I'm trying to create a Document instance with params passed from the post-submitted form: My Mongo mapped document looks like: class Good include MongoMapper::Document key :title, String key :cost, Float key :description, String timestamps! many :attributes validates_presence_of :title, :cost end And create action: def create @good = Good.new(params[:good]) if @good.save redirect_to @good else render :new end end params[:good] containes all valid document attributes - {"good"={"cost"="2.30", "title"="Test good", "description"="Test description"}}, but I've got a strange error from rails: undefined method `keys' for ["title", "Test good"]:Array My gem list: *** LOCAL GEMS *** actionmailer (2.3.8) actionpack (2.3.8) activerecord (2.3.8) activeresource (2.3.8) activesupport (2.3.8) authlogic (2.1.4) bson (1.0) bson_ext (1.0) compass (0.10.1) default_value_for (0.1.0) haml (3.0.6) jnunemaker-validatable (1.8.4) mongo (1.0) mongo_ext (0.19.3) mongo_mapper (0.7.6) plucky (0.1.1) rack (1.1.0) rails (2.3.8) rake (0.8.7) rubygems-update (1.3.7) Any suggestions how to fix this error?

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• Error on rake : The platform 'i386-mingw32' is unsupported.

  - by pm8

  I have Ruby 1.9 and rails 2.3.5 installed. After creating a rails app when I run rake db:create, I get i386-mingw32 error. I have both msysgit and cygwin on my windows machine. rake db:create (in C:/mydirectory) ==== UNSUPPORTED PLATFORM ====================================================== The platform 'i386-mingw32' is unsupported. Please help the author by editing the following file to allow your sqlite3 library to be found, and submitting a patch to [email protected]. Thanks! C:/Ruby19/lib/ruby/gems/1.9.1/gems/sqlite3-0.0.3/lib/sqlite3/driver/ffi/api.rb How can I get this issue fixed without uninstalling msysgit (since I use it for SCM on github)?

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• Self documenting REST interface

  - by KandadaBoggu

  I have a Rails based server running several REST services and a Rails based web UI that interacts with the server using ActiveResource. Same server is being used by other clients( e.g: mobile). I have to generate documentation for the REST interface. I need to provide service URL, input/output and error document structure for each service. Ideally, I would like to use an interceptor at the server side that will document the service based on the existing traffic. I am wondering if there is a gem to do this.

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• Send Redirects To Specific Ports

  - by Garrett

  I have an Rails application server that is listening on port 9000, and is being called through haproxy. All my redirects from that server are being redirected back through port 9000, when they should be sent back on port 80. I am using a combination of haproxy + nginx + passenger. Is there a way to make sure all redirects are being sent through port 80, regardless of what port the actual server is listening on? I don't care if its a haproxy, nginx, Passenger, or Rails change. I just need to make sure most requests unless specified otherwise, are sent back to port 80. Thanks!

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• Performing AJAX calls on the "new" controller

  - by shmichael

  In my rails app, I want to have a sortable list as part of an object creation. The best practice suggested Railscast adds the acts_as_list plugin and then initiates AJAX calls to update item position. However, AJAX calls won't work on an unsaved model, which is the situation with new. One solution would be to save the model immediately on new and redirect to edit. This would have a nice side effect of persisting any change so the user could resume work should he be interrupted. However, this solution adds the unwanted complexity of saving an invalid model, compromising rails' validation processes. Is there any better way to allow AJAX + validations without going into too much work?

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• Why render_component is depreciated ?

  - by sameera207

  Hi All, Why render_component is depreciated in rails 2, What is the rational behind that ? Thanks cheers sameera

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• Action Controller: Exception - ID not found

  - by Danny McClelland

  Hi Everyone, I am slowly getting the hang of Rails and thanks to a few people I now have a basic grasp of the database relations and associations etc. You can see my previous questions here: http://stackoverflow.com/questions/2714621/rails-database-relationships I have setup my applications models with all of the necessary has_one and has_many :through etc. but when I go to add a kase and choose from a company from the drop down list - it doesnt seem to be assigning the company ID to the kase. You can see a video of the the application and error here: http://screenr.com/BHC You can see a full breakdown of the application and relevant source code at the Git repo here: http://github.com/dannyweb/surveycontrol If anyone could shed some light on my mistake I would be appreciate it very much! Thanks, Danny

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• How to import RoR project to Netbeans

  - by user369759

  I have very simple (in fact empty ) project which i have created by rails new MyProject command from command-line. So, i want to import it to NetBeans IDE. I click "new project" - "RoR" - "from existing source", select Ruby 1.9.2 (instead of embedded JRuby) in the wizard form. After that i have got errors [see the picture below]: So.. i click OK. And then try to run the RoR application from NetBeans clicking on the run-button and i got the following error in the log-panel: /home/ses/.rvm/rubies/ruby-1.9.2-p136/bin/ruby: No such file or directory -- script/server (LoadError) So how to handle these two problems? and, replying the comment to my question. yes, i performed following commands: bundle install Using rake (0.8.7) Using abstract (1.0.0) Using activesupport (3.0.3) Using builder (2.1.2) Using i18n (0.5.0) Using activemodel (3.0.3) Using erubis (2.6.6) Using rack (1.2.1) Using rack-mount (0.6.13) Using rack-test (0.5.7) Using tzinfo (0.3.24) Using actionpack (3.0.3) Using mime-types (1.16) Using polyglot (0.3.1) Using treetop (1.4.9) Using mail (2.2.15) Using actionmailer (3.0.3) Using arel (2.0.7) Using activerecord (3.0.3) Using activeresource (3.0.3) Using bundler (1.0.10) Using mysql2 (0.2.6) Using thor (0.14.6) Using railties (3.0.3) Using rails (3.0.3) p.s. my application is working when i launch it from the console. i use ruby-1.9.2 and RoR 3.0 and Netbeans 6.9.1 and Ubuntu 10.10 bundle pack Using rake (0.8.7) Using abstract (1.0.0) Using activesupport (3.0.3) Using builder (2.1.2) Using i18n (0.5.0) Using activemodel (3.0.3) Using erubis (2.6.6) Using rack (1.2.1) Using rack-mount (0.6.13) Using rack-test (0.5.7) Using tzinfo (0.3.24) Using actionpack (3.0.3) Using mime-types (1.16) Using polyglot (0.3.1) Using treetop (1.4.9) Using mail (2.2.15) Using actionmailer (3.0.3) Using arel (2.0.7) Using activerecord (3.0.3) Using activeresource (3.0.3) Using bundler (1.0.10) Using mysql2 (0.2.6) Using thor (0.14.6) Using railties (3.0.3) Using rails (3.0.3) Updating .gem files in vendor/cache Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed. Updating .gem files in vendor/cache

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• Problem extracting text from RSS feeds

  - by Gautam

  Hi, I am new to the world of Ruby and Rails. I have seen rails cast 190 and I just started playing with it. I used selector gadget to find out the CSS and XPath I have the following code.. require 'rubygems' require 'nokogiri' require 'open-uri' url = "http://www.telegraph.co.uk/sport/football/rss" doc = Nokogiri::HTML(open(url)) doc.xpath('//a').each do |paragraph| puts paragraph.text end When I extracted text from a normal HTML page with css, I could get the extracted text on the console. But when I try to do the same either with CSS or XPath for the RSS Feed for the following URL mentioned in the code above, I dont get any output. How do you extract text from RSS feeds?? I also have another silly question. Is there a way to extract text from 2 different feeds and display it on the console something like url1 = "http://www.telegraph.co.uk/sport/football/rss" url2 = "http://www.telegraph.co.uk/sport/cricket/rss" Looking forward for your help and suggestions Thank You Gautam

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• Link all'interno di un campo testo

  - by aleds

  Ciao a tutti, nella Rails app che sto realizzando, l'utente ha la possibilita' di inserire un post (campo memo) con all'interno una URL. Ad esempio: "bla bla bla bla www.blabla.com bla bla bla ..." Nel mostrare tale post vorrei che www.blabla.com diventasse un link cliccabile (come avviene in twitter). Ovviamente deve essere fatto un parsing della url, immagino usando le espressioni regolari. Avete dei consigli in merito ? Esiste qualcosa di gia' fatto oppure inizio da subito a scrivere il codice :) ? Grazie Alessandro DS http://alex-on-rails.blogspot.com/

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• Cucumber Makes Behavior-Driven Ruby on Rails Development Cool

  <b>WDVL:</b> "This article introduces the Cucumber framework, a tool for implementing the Behavior-Driven Development (BDD) methodology. The idea behind BDD is simple: everyone should understand the system features. Cucumber promotes this idea by enabling the features of a system to be written in the native language of the program as either specs or functional tests."

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• Prime Number - Data while loading

  - by Emroot

  Hi, I was trying in Ruby on Rails how to find a prime number. Here is my code : helper : app/helpers/test_helper.rb module TestHelper def prime_number? number index = 2 tmp = 0 while index <= number if tmp < 1 if (number % index) == 0 tmp += 1 end else return false end index += 1 end return true end end and my view : app/views/test/index.html.erb <% (2..100).each do |i| -%> <% if prime_number? i %> <%= i %> <% end -%> <% end -%> So my question is : How can you load data while it's calculating ? I mean if I replace 100 by 100000 in my view, how can I see data on my view while my helper method is calculating ? Do I need to use ajax or rails provide a tool for that ? Thank you.

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• Google Maps integration with JSON - CircularReferenceError

  - by JZ

  I'm working on Rails 3.0.0.beta2, following Advanced Rails Recipes "Recipe #32, Mark locations on a Google Map" and I hit a road block. The following code is returning a "ActiveSupport::JSON::Encoding::CircularReferenceError" "object references itself" at line 3. This code represents the /layouts/maps.html.erb file <% if @maps -%> <script type="text/javascript"> var maps = <%= @maps.to_json %>; </script> <% end -%> This is my first attempt at rendering JSON, and I don't know how to debug this problem. Do you have experience with this? What could cause this problem? Thank you in advance!

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• Strange routing

  - by astropanic

  How I can setup my rails app to respond to such urls: http://mydomain.com/white-halogene-lamp http://mydomain.com/children-lamps http://mydomain.com/contact-form The first one should link to my products controller, and show my product with this name The second one should link to my categories controller, and show the category with this name The third one should link to my sites controller, and show the site with this title. All three models (product, category, site) have a method to_seo, giving the mentioned above urls (after the slash) I know it's not the restful way, but please don't disuss here, it is wrong approach or not, that's not the question. The question is how to accomplish this weird routing ? I know we have catch all routes, but how I can tell rails to use different controllers on different urls in the catch all route ? Or have You an better idea ? I would avoid redirects to other urls.

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• Why is 'heroku create' doing nothing?

  - by vlasits

  I opened a heroku account. I followed the instructions on http://docs.heroku.com/quickstart. I have a working rails app which I have deployed successfully elsewhere. I have a github account that works. I have a local git repository for my rails app. I installed the heroku gem. It shows up in my gem list. I typed 'heroku create' at the command prompt... My command console showed that it was thinking about it, but did nothing. No errors. No action. Possible related facts: I am using a Windows 7 machine. I have also failed miserably at deploying with capistrano with a similar--issue command, get no response--pattern.

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• Handling exceptions raised in observers

  - by sparky

  I have a Rails (2.3.5) application where there are many groups, and each Group has_many People. I have a Group edit form where users can create new people. When a new person is created, they are sent an email (the email address is user entered on the form). This is accomplished with an observer on the Person model. The problem comes when ActionMailer throws an exception - for example if the domain does not exist. Clearly that cannot be weeded out with a validation. There would seem to be 2 ways to deal with this: A begin...rescue...end block in the observer around the mailer. The problem with this is that the only way to pass any feedback to the user would be to set a global variable - as the observer is out of the MVC flow, I can't even set a flash[:error] there. A rescue_from in the Groups controller. This works fine, but has 2 problems. Firstly, there is no way to know which person threw the exception (all I can get is the 503 exception, no way to know which person caused the problem). This would be useful information to be able to pass back to the user - at the moment, there is no way for me to let them know which email address is the problem - at the moment, I just have to chuck the lot back at them, and issue an unhelpful message saying that one of them is not correct. Secondly (and to a certain extent this make the first point moot) it seems that it is necessary to call a render in the rescue_from, or it dies with a rather bizarre "can't convert Array into String" error from webbrick, with no stack trace & nothing in the log. Thus, I have to throw it back to the user when I come across the first error and have to stop processing the rest of the emails. Neither of the solutions are optimal. It would seem that the only way to get Rails to do what I want is option 1, and loathsome global variables. This would also rely on Rails being single threaded. Can anyone suggest a better solution to this problem?

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• is Web Development moving too fast?

  - by Imran

  I find myself constantly learning new things in web development and there is always soo much to learn in general. Currently i work with PHP and have tried to keep up with Ruby on Rails(RoR) but it's moving so fast i'm not sure i can keep up with the latest changes. Does anyone else have trouble keeping up with so much innovation in web development or is it just me? And how do you guys cope with the never ending learning process especially with Rails? Just looking for tips Tricks and personal experiences really Thanks in advance;-)

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• Storing multiple checkbox values in database

  - by Madjokr

  Hi, I want to store multiple column values in table.Lets take a example .. What are your favourite colors? the choices can be red,blue,green, orange. So lets assume, the user selects atleast 2 values. Is there any way to store the multiple values in table. I have implemented by concatinating choices of users in a column in the table. I later found that it is a bad practise. Currently i can think of using Bitwise operator and habtm. What are the different ways for storing multiple choices values in table? If I am implementing in rails, What is the best way to implement this with OOP concepts? Is there any builtin options in rails?

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• adding hobby to a user

  - by rookieRailer

  I'm trying to write a rails application. I'm a ruby-on-rails newbie. I have a User model and a Hobby model. class User < ActiveRecord::Base has_many :hobbies end class Hobby < ActiveRecord::Base belongs_to :user end During the new user registration, I have used a text box where I enter a value for hobby. Then, when I press a button 'Add hobby', a method in UsersController add_hobby is to be called where I intend to append the value entered for hobby by user to the user i.e @user.hobbies << hobby However, my problem is that the user object has not been saved yet, so there is no way to access a particular user object. How do I get around this problem ?

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• Erubis block helper throwing error with concat

  - by DEfusion

  I have a couple of block helpers, here's a simple example of what I'm doing: def wrap_foo foo, &block data = capture(&block) content = " <div class=\"foo\" id=\"#{foo}\"> #{data} </div>" concat( content ) end I'm just trying out erubis and it's giving me the following error: You have a nil object when you didn't expect it! You might have expected an instance of Array. The error occurred while evaluating nil.<< Removing the call to concat removes the error but ends up with my wrapper not being rendered Using: Rails 2.3.5 Erubis 2.6.5 And tried this gem that helps Erubis (though 2.6.4) and Rails 2.3 play better together

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• Enforcing a Uniqueness Constraint in a Nested Form

  - by Euwyn

  I'm trying not to fight the defaults here and use Rails built-in support for nested attributes (from http://ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attributes). I'm labeling Things with Tags, and all works swell, and for each Thing I have a form with a nested field that creates a new Tag by a name. Trouble is, I need to make sure that each Tag has a unique name. Instead of creating a new Tag, if a user enters the name of one that already exists, I need to create the associate with that pre-existing Tag. How do I do this?

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• How to register a domain for a beginner?

  - by garbage collection

  I've never registered a .com , .net like domain before, and I would like to do some research before doing so. I currently have a ruby on rails app running Heroku. Is there anything special I have to do prior to registering domain on my ruby on rails app at all? Or is it as easy as just inserting my current Heroku address to mask it with another .com or .net name? Is there some special features I should look for registering domain? Or is it typical for domain seller to just sell domain names only? Any recommendations on sellers? Thank you.

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