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• Rails: periodically use HEAD to check for page changes

  - by Chris

  I have a Rails app implementing a game, so it's expected that a player will leave a browser open at the game page. When player Alan takes an action himself, I use AJAX requests to update the game page Alan is viewing to reflect the new state. However, when another player (Bob) takes an action, I don't have (or want) a mechanism to push the change to Alan's view. I would like Alan's page to periodically poll the Rails server to find if there have been any changes since last reload, and to reload the page (either via a whole-page GET or an AJAX call) if not. In order to play nicely with caches and proxies, I'd like to do this by issuing a periodic HTTP HEAD request, get Rails to work out the timestamp of the last change (trivially available from my DB) and respond with that in the Last-Modified header; then have the client-side act on that timestamp. How can I go about doing this?

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• Properly handling unicode characters in Rails

  - by Gdeglin

  By default Rails allows users of our application to input non-utf8 data, such as: ¶®«¼ However when we attempt to retrieve the data from our database and render it in a template Rails incorrectly assumes that it is in UTF-8 format and throws an error. ArgumentError: invalid byte sequence in UTF-8 What is the best way to handle this? I have seen one fix that suggested sanitizing the data in every place the user can input it. However, that would involve changing a considerable amount of code and it would strip out the characters entirely. Ideally we would want some characters converted to their UTF-8 equivalents. Our environment: Ruby: 1.9.1 Rails 2.3.5 MySql Gem: 2.8.1 This is a serious and urgent problem for us so your answers are very appreciated!

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• Rails belongs_to issues

  - by Rahul

  I was trying to follow the answer provided by this post About Event_calendar.Showing only events for current user and not all events present However when I tried to add the belongs_to user in the event model, it gives me the following error. NameError (undefined local variable or method 'user' for #<Class:0x007fff15d1f6c0>): app/models/event.rb:3:in '<class:Event>' app/models/event.rb:1:in '<top (required)>' app/controllers/calendar_controller.rb:9:in 'index' Rendered .../.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/_trace.erb (2.8ms) Rendered .../.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (2.0ms) Rendered .../.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (23.6ms) in my user.rb model I have included has_many :events Any idea how to fix this?

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• How to render a Partial from a Model in Rails 2.3.5

  - by empire29

  I have a Rails 2.3.5 application and Im trying to render several Partials from within a Model (i know, i know -- im not supposed to). The reason im doing this is im integrating a Comet server (APE) into my Rails app and need to push updates out based on the Model's events (ex. after_create). I have tried doing this: ActionView::Base.new(Rails::Configuration.new.view_path).render(:partial => "pages/show", :locals => {:page => self}) Which allows me to render simple partials that don't user helpers, however if I try to user a link_to in my partial, i receive an error stating: undefined method `url_for' for nil:NilClass I've made sure that the object being passed into the "project_path(project)" is not nil. I've also tried including: include ActionView::Helpers::UrlHelper include ActionController::UrlWriter in the Module that contains the method that makes the above "render" call. Does anyone know how to work around this? Thanks

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• Unknown user 'app' with capistrano

  - by trobrock

  This is my first time trying to set up capistrano to deploy a rails application. I am deploying from my local machine to my remote server that has the repo, web, app, and mysql servers all on the same machine. I am following this walk through: http://www.capify.org/index.php/From_The_Beginning I get to the command cap deploy:start Then I get this error: *** [err :: example.com] sudo: unknown user: app command finished failed: "sh -c 'cd /var/www/example/current && sudo -p '\\''sudo password: '\\'' -u app nohup script/spin'" on example.com Am I supposed to add an 'app' user, or is there a way of changing what user the command runs as? This is my deploy.rb: set :application, "example" set :repository, "[email protected]:example.git" set :user, "trobrock" set :branch, 'master' set :deploy_to, "/var/www/example" set :scm, :git # Or: `accurev`, `bzr`, `cvs`, `darcs`, `git`, `mercurial`, `perforce`, `subversion` or `none` role :web, "example.com" # Your HTTP server, Apache/etc role :app, "example.com" # This may be the same as your `Web` server role :db, "example.com", :primary => true # This is where Rails migrations will run And obviously everywhere it says example.com is my servers hostname and every it just says example is the app name.

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• Multiple Forms on the Same Page with Rails

  - by Eric Koslow

  So I'm building a rails app for high school students and I've hit a problem when it comes to creating users. I want the students to only be able to create accounts if they select their school and type in their school's password correctly. What is the correct / easiest way of doing this? Should I create a gatekeeper to the user#new action that they have to pass first or if their a way that on the same page a student can submit to forms. One would be the regular username, email, password using: form_for @user do ... end But then creating another form for the high-school / high-school password selection. Ideally the controller would be able to get the params of the high-school form, validate those, then go on to create the user from the user params. Is this possible using rails? My setup: Rails 3 and Ruby 1.9.2dev Thank you!

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• Rails plugin for generating dynamic / ajax crud interfaces compatible with Rails 3 beta?

  - by mikehansen

  Anyone know of some good gems or plugins to create dynamic / ajax crud interfaces for Rails 3 projects? I know active scaffold was popular before and it's been awhile since I have used it / any other gems similar to this (I usually just write it myself). I like the direction that the formtastic gem (http://github.com/justinfrench/formtastic) is headed and wonder what else people are combining with it. Also I like the generators approach that Ryan Bates uses and he appears to be making updates for Rails 3. Anything else I am missing here? (I am also open to gems not compatible with Rails 3 too I guess, I can always make a contribution and try to help them get to the next phase. ;)) PS - Really stackoverflow, only one hyperlink?? lame.

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• Deploying rails app on phusion passenger + Nginx

  - by user1028432

  I installed passenger + nginx: gem install passenger , passenger-install-nginx-module , and making init script nginx conf(/opt/nginx/conf/nginx.conf): worker_processes 1; events { worker_connections 1024; } http { passenger_root /home/rusik/.rvm/gems/ruby-2.0.0-p247@work/gems/passenger-4.0.21; passenger_ruby /home/rusik/.rvm/wrappers/ruby-2.0.0-p247@work/ruby; include mime.types; default_type application/octet-stream; sendfile on; rails_env development; server { listen 80; server_name www.myapp.com; charset utf-8; root /home/rusik/www/testapp/public; passenger_enabled on; } } restarting nginx , and page www.myapp.com doesn't load , what can be a problem?(changeing rails_env i tried , rails s i running) I am trying a lot of time to make it works , but can't , i am also tryed install through apt repositiry, but the problem is the same , the page doesn't loaded!

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• Is VirtualBox really slow compared to the host OS? (for Ruby development)

  - by dan

  I have VirtualBox running Ubuntu as a guest environment on my Macbook Pro running Leopard OS X 10.5. I timed the same batch of Ruby on Rails unit tests on both systems. The difference seems to be quite big. The same suite of Ruby unit tests that take 13.4 seconds in the native OS X, take 82 seconds to run in VirtualBox Ubuntu. Are other people doing the same kind of development noticing the same differences?

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• How to approach people you've found through internet with similar programming interests?

  - by randomguy

  I've recently really dived into Ruby/Rails and I'm falling in love. I have a gut feeling this might be something that could last for a while. What I've been missing is interaction with people who are as passionate about Ruby, Rails and things closely related to these. I live in a relatively small city, but was able to find five local people through a RoR website. Weekly meetups with Macs, beer and bro-love rushed through my mental theater. Seriously though, I have no clue how I could approach these people. I have their e-mail addresses. Any advice?

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• Ruby on Rails on Windows - IIS 7 or IIS 6?

  - by Jon

  I have seen a few places ( one example ) that there are newer speed improvements in IIS 7 on Windows 2008. While I know we would see possibly more power running ruby on rails under a Linux machine, the requirements depend on me using Windows. I was wondering if anyone knew the best setup for Ruby/Rails in a Windows environment. This machine will mainly be running a redmine.org instance.

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• How to set global variables to use everywhere in my application?

  - by user502052

  I am using Ruby on Rails 3 and I would like to set some global variable to use those everywhere in my application. In particular, the domain name. If, for example, my website URL is http://subname.domain.com I would like to set or retrieve the subname.domain.com value in order to use that in my application like this request_uri = "http://#{sub_domain_name}" Where and how I have to state\initialize the sub_domain_name variable or other variables at all?

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• Exclamation mark used with assert method in its parameters.

  - by Maxsy

  Okay this has been lingering in my head for quite a while now. In ruby on rails unit testing there is an exclamation mark with the assert method. Here is an example test "No empty values to be inserted" do product = Produce.new assert !product.save end Let me know the function of the exclamation mark. Quick replies appreciated. Thanks.

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• How to add values dynamically to I18n?

  - by Dima Goltsman

  I have many ymls in my rails app, and i want to put some of them in other service, so that i can call this from multiple places. the response of this call will be a hash. {"en" : {"test" : {"text1" : "hi english"}, {"text2" : "mambo number %{num}"} }, "es" : {"test" : {"text1" : "hi espaniol"}, {"text2" : "mamboes numeros %{num}"} } } is there a way i can load that hash into I18n translations like I18n.add_translations(some_hash) so i can access them with I18n.t("test.text1") I18n.t("test.text2", :num => 5) how can i achieve it?

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• No route matches {:controller=>"welcome", :action=>"contact"}

  - by jade

  I'm new to rails so it may sound quite naive.I'm getting this error No route matches {:controller=>"welcome", :action=>"contact"} Here is my routes.rb root :to => 'welcome#index' Here is my controller class WelcomeController < ApplicationController def index redirect_to :action => :contact end end And i have a contact.html.erb in my app/view/.What am i doing wrong?

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• How to create factories with attr_accesible?

  - by regedarek

  How to deal with factories and attr_accessible? My example: # model class SomeModel attr_accessible :name, full_name, other_name end #spec require 'spec_helper' describe "test" do it do create(:some_model, name: "test name", user: User.first) #factory end end #error ruby(17122,0x12a055000) malloc: *** error for object 0x8: pointer being freed was not allocated *** set a breakpoint in malloc_error_break to debug I think the error is because user_id is not in attr_accesible atributes

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• assign a model's attribute through association

  - by justcode

  I'm new to rails and working on a rails app and I'm stuck pondering this issue. I have three models class product < ActiveRecord::Base attr_accessible :name, :issn, :category validates_presence_of :name, :issn, :category validates_numericality_of :issn, :message => "has to be a number" has_many :user_products has_many :users, :through => :user_products end class UserProduct < ActiveRecord::Base attr_accessible :price, :category validates_presence_of :price, :category validates_numericality_of :price, :message = "has to be a number" belongs_to :user belongs_to :product end class user < ActiveRecord::Base # devise authentication here # Setup accessible (or protected) attributes for your model attr_accessible :email, :password, :password_confirmation, :remember_me has_many :user_products has_many :products, :through = :user_products end here is my new.html.erb <div class="MainBodyWrapper"> <div class="span8"> <div id="listBoxWrapper"> <fieldset> <%= form_for(@product, :html => { :class => "form-inline" }, :style => "margin-bottom: 60px" ) do |f| %> <div class="control-group"> <label class="control-label" for="name">name</label> <div class="controls"> <%= f.text_field :price, :class => 'input-xlarge input-name', :id => "name" %> </div> </div> <div class="listingButtons"> <button class="btn btn-info"></i>Add</button> <a class="btn">Upload Pictures (anytime)</a> </div> </fieldset> </div> </div> There are reasons why I want to setup the models this way. So the question is this: I want the user to enter the info for the product in the form but it also involves putting in the price of the product which exists in a different model/table (user_product) that is associated with product. How can I do this? You can see that my form_for uses @product. Any help will be appreciated.

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• Is there an ActiveRecord equivalent to using a nested subquery i.e. ... where NOT IN(select...) ?

  - by Snorkpete

  I have 3 models: Category, Account, and SubAccount The relations are: Accounts has_many :sub_accounts Categories has_many :sub_accounts I wanted to get a list of all Categories that are not used by a given account. My method in the Category model currently looks like: class Category < ActiveRecord::Base def self.not_used_by(account) Category.find_by_sql("select * from categories where id not in(select category_id from sub_accounts where account_id = #{account.id})") end end My question is, is there a cleaner alternative than using SQL? NB. I am currently using Rails 3(beta)

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• How to make the 'week' starts with a specific day not Monday?

  - by amrnt

  In an application am building, i'm trying to make the week starts with Saturday. In ruby on rails, by default, the week begins on Monday. So If you have any trick or a patch to make it work for me! Thanks in advance!

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• how did i break :method -> :delete

  - by Tallboy

  i refactored my entire application and gave it a whole new design. The one thing that seems to be broken is all the original link_to methods I had which were :method = :delete are now getting sent as a GET request. The only thing I did that I can remember that might cause it is delete jquery-rails from the gemfile (I'm just getting it from google ajax). Does anyone have any other ideas what I could have deleted?

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• Changing the default ActiveRecord id from 0 to 1000000

  - by jrk

  Hello there, I'd like to change the minimum for the id of created objects from 1 to 1000. So when I create in rails my first model object it gets the ID 1000 and not 1. Is there a way to set this in the schema/migration files?

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• ruby on rails gitorious setup on ubuntu

  - by dogmatic69

  Ive been trying to install gitorious for a while now which required ruby and rails etc. Ive finally got rails pages serving but cant finish the installation of gitorious because the gem version is too new. the error logs say please run 'rake ultrasphinx:configure' and that gives rake ultrasphinx:configure (in /var/www/apps/gitorious) rake aborted! uninitialized constant ActiveSupport::Dependencies::Mutex /var/www/apps/gitorious/Rakefile:10:in `require' (See full trace by running task with --trace) From searching google this is beacuse of the wrong gem verison. Cant find a way to down grade it. apparently sudo gem update --system 1.4.2 should do the trick but ubuntu 10.10 does not like this. ERROR: While executing gem ... (RuntimeError) gem update --system is disabled on Debian, because it will overwrite the content of the rubygems Debian package, and might break your Debian system in subtle ways. The Debian-supported way to update rubygems is through apt-get, using Debian official repositories. If you really know what you are doing, you can still update rubygems by setting the REALLY_GEM_UPDATE_SYSTEM environment variable, but please remember that this is completely unsupported by Debian. So i added export REALLY_GEM_UPDATE_SYSTEM=1 to .bashrc and reloaded it with . ~/.bashrc and still the same. ive tried various forms of setting this environmental variable with no luck. Ive also been told on #gitorious irc channel to add the file config/initializers/rubygems.rb with the line require "thread" to it. This has done nothing. EDIT: Just found another way which was rvm install rubygems 1.4.2 and it gave: Removing old Rubygems files... Installing rubygems dedicated to ruby-1.8.7-p334... Retrieving rubygems-1.4.2 % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 288k 100 288k 0 0 282k 0 0:00:01 0:00:01 --:--:-- 414k Extracting rubygems-1.4.2 ... Installing rubygems for /home/ubuntu/.rvm/rubies/ruby-1.8.7-p334/bin/ruby ERROR: Error running 'GEM_PATH="/home/ubuntu/.rvm/gems/ruby-1.8.7-p334:/home/ubuntu/.rvm/gems/ruby-1.8.7-p334@global:/home/ubuntu/.rvm/gems/ruby-1.8.7-p334@global" GEM_HOME="/home/ubuntu/.rvm/gems/ruby-1.8.7-p334" "/home/ubuntu/.rvm/rubies/ruby-1.8.7-p334/bin/ruby" "/home/ubuntu/.rvm/src/rubygems-1.4.2/setup.rb"', please read /home/ubuntu/.rvm/log/ruby-1.8.7-p334/rubygems.install.log WARN: Installation of rubygems did not complete successfully. TL;DR please tell me how to downgrade rubygems on ubuntu 10.10 or upgrade gitorious to work with 1.6.2 gems

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• how to create wizard forms in ruby on rails

  - by Branden Silva

  I'm trying to understand the best options for pulling off a wizard form in ruby on rails. Ideally I'd like to have it so the application signup has a back and next button that allows the user to submit data in steps. So in step 1 they could fill out contact info. Once they are done they could click next and be on step 2 to fill out payment info, etc. If they make a mistake, they can click back and correct it. Some steps will be required, while others will not, but you do have to make it to the last step to submit the data to the database to sign up. They then need the ability to go back and fill out the past steps in the same fashion after completion. (example: perhaps if they clicked on a profile link they could recomplete the steps in the same fashion because they didn't want to complete all the steps right away. Maybe by being given a skip button before they completed the steps to sign up?). I also need validation to happen on what steps have been completed preventing them from moving onto the next step until corrected or completed. Option 1) I've noticed that ajax has been recommended as an option in other questions on stackoverflow. The only problem I have with it is that the user would not be able to sign up if javascript was disabled. Ideally I'd like to have it be native to ruby on rails but I'm willing to work with whatever is necessary to get it to work.

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• WYSIHAT Photos upload not working - Paperclip - Ruby on Rails

  - by bgadoci

  I just successfully installed WysiHat in my rails blog. Seems that the 'add a picture' feature is not working. It successfully allows me to find and select a picture from my desktop but upon clicking save, it does nothing. I also have Paperclip successfully installed. I am wondering if this may have something to do with it. Perhaps Paperclip is getting in the way, or, perhaps I need to connect Paperclip and WysiHat somehow. Any ideas? (let me know if I need to post any code). Also, WysiHat-engine uses facebox, not sure if that is relevant. UPDATE: Added Server Log, looks like paperclip is saving it so not sure what else is going wrong. Processing PostsController#update (for 127.0.0.1 at 2010-04-23 16:42:14) [PUT] Parameters: {"commit"=>"Update", "post"=>{"body"=>"<p>Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.</p>", "title"=>"Rails Code for Search"}, "authenticity_token"=>"hndm6pxaPLfgnSMFAmLDGNo86mZG3XnlfJoNOI/P+O8=", "id"=>"105"} Post Load (0.2ms) SELECT * FROM "posts" WHERE ("posts"."id" = 105) Post Update (0.3ms) UPDATE "posts" SET "updated_at" = '2010-04-23 21:42:14', "body" = '<p>Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.</p>' WHERE "id" = 105 [paperclip] Saving attachments. Redirected to http://localhost:3000/posts/105 Completed in 12ms (DB: 0) | 302 Found [http://localhost/posts/105]

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• Autocomplete Error Question - Ruby on Rails

  - by bgadoci

  I have built a very simple blog application using Ruby on Rails. New to both Ruby and Rails so excuse the stupid questions. I currently have two tables that relate to this question. I have a Post table and a Tag table. Basically I set it up such that Post has_many :tags and Tag belongs_to :post. I am using AJAX to process and display the tags in the show view of the post. I installed the auto_complete plugin and I am getting an error when I enter the letters in the text_field_with_auto_complete for tag creation. My suspicion is this is because the form is a remote_form_for or something I am doing wrong in the routes.rb. Here is the error and code: Error Processing PostsController#show (for 127.0.0.1 at 2010-04-13 23:25:46) [GET] Parameters: {"tag"=>{"tag_name"=>"f"}, "id"=>"auto_complete_for_tag_tag_name"} Post Load (0.1ms) SELECT * FROM "posts" WHERE ("posts"."id" = 0) ActiveRecord::RecordNotFound (Couldn't find Post with ID=auto_complete_for_tag_tag_name): app/controllers/posts_controller.rb:22:in `show' Rendered rescues/_trace (26.0ms) Rendered rescues/_request_and_response (0.2ms) Rendering rescues/layout (not_found) remote_form_for located in /views/posts/show.html.erb <% remote_form_for [@post, Tag.new] do |f| %> <p> <%= f.label :tag_name, "Tag" %><br/> <%= text_field_with_auto_complete :tag, :tag_name, {}, {:method => :get} %> </p> <p><%= f.submit "Add Comment" %></p> <% end %> tags_controller.rb (I'll spare you all the actions but added the following here) auto_complete_for :tag, :tag_name routes.rb map.resources :posts, :has_many => :comments map.resources :posts, :has_many => :tags map.resources :tags, :collection => {:auto_complete_for_tag_tag_name => :get }

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