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• Best ways to teach a beginner to program?

  - by Justin Standard

  Original Question I am currently engaged in teaching my brother to program. He is a total beginner, but very smart. (And he actually wants to learn). I've noticed that some of our sessions have gotten bogged down in minor details, and I don't feel I've been very organized. (But the answers to this post have helped a lot.) What can I do better to teach him effectively? Is there a logical order that I can use to run through concept by concept? Are there complexities I should avoid till later? The language we are working with is Python, but advice in any language is welcome. How to Help If you have good ones please add the following in your answer: Beginner Exercises and Project Ideas Resources for teaching beginners Screencasts / blog posts / free e-books Print books that are good for beginners Please describe the resource with a link to it so I can take a look. I want everyone to know that I have definitely been using some of these ideas. Your submissions will be aggregated in this post. Online Resources for teaching beginners: A Gentle Introduction to Programming Using Python How to Think Like a Computer Scientist Alice: a 3d program for beginners Scratch (A system to develop programming skills) How To Design Programs Structure and Interpretation of Computer Programs Learn To Program Robert Read's How To Be a Programmer Microsoft XNA Spawning the Next Generation of Hackers COMP1917 Higher Computing lectures by Richard Buckland (requires iTunes) Dive into Python Python Wikibook Project Euler - sample problems (mostly mathematical) pygame - an easy python library for creating games Create Your Own Games With Python ebook Foundations of Programming for a next step beyond basics. Squeak by Example Recommended Print Books for teaching beginners Accelerated C++ Python Programming for the Absolute Beginner Code by Charles Petzold

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• Error when pushing to Heroku - ...appear in group - Ruby on Rails

  - by bgadoci

  I am trying to deploy my first rails app to Heroku and seem to be having a problem. After git push heroku master, and heroku rake db:migrate I get an error saying: SELECT posts.*, count(*) as vote_total FROM "posts" INNER JOIN "votes" ON votes.post_id = posts.id GROUP BY votes.post_id ORDER BY created_at DESC LIMIT 5 OFFSET 0): I have included the full error below and also included the PostControll#index as it seems that is where I am doing the grouping. Lastly I included my routes.rb file. I am new to ruby, rails, and heroku so sorry for simple/obvious questions. Processing PostsController#index (for 99.7.50.140 at 2010-04-21 12:50:47) [GET] ActiveRecord::StatementInvalid (PGError: ERROR: column "posts.id" must appear in the GROUP BY clause or be used in an aggregate function : SELECT posts.*, count(*) as vote_total FROM "posts" INNER JOIN "votes" ON votes.post_id = posts.id GROUP BY votes.post_id ORDER BY created_at DESC LIMIT 5 OFFSET 0): vendor/gems/will_paginate-2.3.12/lib/will_paginate/finder.rb:82:in `send' vendor/gems/will_paginate-2.3.12/lib/will_paginate/finder.rb:82:in `paginate' vendor/gems/will_paginate-2.3.12/lib/will_paginate/collection.rb:87:in `create' vendor/gems/will_paginate-2.3.12/lib/will_paginate/finder.rb:76:in `paginate' app/controllers/posts_controller.rb:28:in `index' /home/heroku_rack/lib/static_assets.rb:9:in `call' /home/heroku_rack/lib/last_access.rb:25:in `call' /home/heroku_rack/lib/date_header.rb:14:in `call' thin (1.0.1) lib/thin/connection.rb:80:in `pre_process' thin (1.0.1) lib/thin/connection.rb:78:in `catch' thin (1.0.1) lib/thin/connection.rb:78:in `pre_process' thin (1.0.1) lib/thin/connection.rb:57:in `process' thin (1.0.1) lib/thin/connection.rb:42:in `receive_data' eventmachine (0.12.6) lib/eventmachine.rb:240:in `run_machine' eventmachine (0.12.6) lib/eventmachine.rb:240:in `run' thin (1.0.1) lib/thin/backends/base.rb:57:in `start' thin (1.0.1) lib/thin/server.rb:150:in `start' thin (1.0.1) lib/thin/controllers/controller.rb:80:in `start' thin (1.0.1) lib/thin/runner.rb:173:in `send' thin (1.0.1) lib/thin/runner.rb:173:in `run_command' thin (1.0.1) lib/thin/runner.rb:139:in `run!' thin (1.0.1) bin/thin:6 /usr/local/bin/thin:20:in `load' /usr/local/bin/thin:20 PostsController def index @tag_counts = Tag.count(:group => :tag_name, :order => 'count_all DESC', :limit => 20) conditions, joins = {}, :votes @ugtag_counts = Ugtag.count(:group => :ugctag_name, :order => 'count_all DESC', :limit => 20) conditions, joins = {}, :votes @vote_counts = Vote.count(:group => :post_title, :order => 'count_all DESC', :limit => 20) conditions, joins = {}, :votes unless(params[:tag_name] || "").empty? conditions = ["tags.tag_name = ? ", params[:tag_name]] joins = [:tags, :votes] end @posts=Post.paginate( :select => "posts.*, count(*) as vote_total", :joins => joins, :conditions=> conditions, :group => "votes.post_id", :order => "created_at DESC", :page => params[:page], :per_page => 5) @popular_posts=Post.paginate( :select => "posts.*, count(*) as vote_total", :joins => joins, :conditions=> conditions, :group => "votes.post_id", :order => "vote_total DESC", :page => params[:page], :per_page => 3) respond_to do |format| format.html # index.html.erb format.xml { render :xml => @posts } format.json { render :json => @posts } format.atom end end routes.rb ActionController::Routing::Routes.draw do |map| map.resources :ugtags map.resources :wysihat_files map.resources :users map.resources :votes map.resources :votes, :belongs_to => :user map.resources :tags, :belongs_to => :user map.resources :ugtags, :belongs_to => :user map.resources :posts, :collection => {:auto_complete_for_tag_tag_name => :get } map.resources :posts, :sessions map.resources :posts, :has_many => :comments map.resources :posts, :has_many => :tags map.resources :posts, :has_many => :ugtags map.resources :posts, :has_many => :votes map.resources :posts, :belongs_to => :user map.resources :tags, :collection => {:auto_complete_for_tag_tag_name => :get } map.resources :ugtags, :collection => {:auto_complete_for_ugtag_ugctag_name => :get } map.login 'login', :controller => 'sessions', :action => 'new' map.logout 'logout', :controller => 'sessions', :action => 'destroy' map.root :controller => "posts" map.connect ':controller/:action/:id' map.connect ':controller/:action/:id.:format' end UPDATE TO SHOW MODEL AND MIGRATION FOR POST class Post < ActiveRecord::Base has_attached_file :photo validates_presence_of :body, :title has_many :comments, :dependent => :destroy has_many :tags, :dependent => :destroy has_many :ugtags, :dependent => :destroy has_many :votes, :dependent => :destroy belongs_to :user after_create :self_vote def self_vote # I am assuming you have a user_id field in `posts` and `votes` table. self.votes.create(:user => self.user) end cattr_reader :per_page @@per_page = 10 end migrations for post class CreatePosts < ActiveRecord::Migration def self.up create_table :posts do |t| t.string :title t.text :body t.timestamps end end def self.down drop_table :posts end end _ class AddUserIdToPost < ActiveRecord::Migration def self.up add_column :posts, :user_id, :string end def self.down remove_column :posts, :user_id end end

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• Login or Register (Ruby on rails)

  - by DanielZ

  Hello stackoverflow, I'm working on an Ruby on Rails application (2.3.x) and i want to make a form that lets the user login or register. I want to do this in the same form. I have a JS function that replaces the form elements like this: Login form: <% form_for @user do |f| %> <div id="form"> <%= f.label :email, "E-mail" %> <%= f.text_field :email %> <%= f.label :password, "Password" %> <%= f.password_field :password %> <%= link_to "I don't have an account, "#", :id => "changeForm"%> <%= f.submit "Login" %> </div> <% end %> The id "changeForm" triggers a JS function that changes the form elements. So if you press the url the html looks like this: <% form_for @user do |f| %> <div id="form"> <%= f.label :name, "Name" %> <%= f.text_field :name %> <%= f.label :email, "E-mail" %> <%= f.text_field :email %> <%= f.label :password, "Password" %> <%= f.password_field :password %> <%= f.label :password_confirmation, "Password confirmation" %> <%= f.password_field :password_confirmation %> <%= link_to "I do have an account, "#", :id => "changeForm"%> <%= f.submit "Register" %> </div> <% end %> I added the neccesary validations to my user model: class User < ActiveRecord::Base attr_reader :password validates_presence_of :name, :email, :password validates_format_of :email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i validates_confirmation_of :password But what happens when you fill in the email / password you get the errors that the name is missing and that the password fields aren't confirmed. So i could do some nasty programming in my user model like this: #if password_conf or the name are present the user has tried to register... if params[:user][:password_confirmation].present? || params[:user][:name].present? #so we'll try to save the user if @user.save #if the user is saved authenticate the user current_session.user = User.authenticate(params[:user]) #if the user is logged in? if current_session.user.present? flash[:notice] = "succesvully logged redirect_to some_routes_path else #not logged in... flash[:notice] = "Not logged in" render :action => "new" end else #user not saved render :action => "new" end else #So if the params[:user][:password_confirmation] or [:user][:name] weren't present we geuss the user wants to login... current_session.user = User.authenticate(params[:user]) #are we logged_in? if current_session.user.present? flash[:notice] = "Succesvully logged in" redirect_to some_routes_path else #errors toevoegen @user.errors.add(:email, "The combination of email/password isn't valid") @user.errors.add(:password," ") render :action => "new" end end end Without validations this (imho dirty code and should not be in the controller) works. But i want to use the validates_presence_of methods and i don't want to slap the "conventions over configurations" in the face. So another thing i have tried is adding a hidden field to the form: #login form <%= f.hidden_field :login, :value => true %> # and ofcourse set it to false if we want to register. And then i wanted to use the method: before_validation before_validation_on_create do |user| if params[:user].login == true #throws an error i know... validates_presence_of :email, :password validates_format_of :email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i else validates_presence_of :name, :email, :password validates_format_of :email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i validates_confirmation_of :password end end But this doesn't work because i can't access the params. And login isn't a attribute for the user object. But i thought that in this way i could validate the email and password params if the user wants to login. And all the other attrs if the user want to register. So all i could think of doesn't work how i want it to work. So my main goal is this: 1 form for login/register with the use of the validation methods in the user model. So if we want to login but don't fill in any information = give validation errors. And if the user wants to login but the email/password combination doens't match give the "@user.errors.add(:email, "the combination wasn't found in the db...")". And the same goes for user register... Thanks in advance!

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• Resolving NameErrors -- Getting NameError on RAILS_END in rails_end.rb When using desert plugin and

  - by dr

  What's an effective approach to debug NameErrors in Rails? I'm trying to use the desert plugin (0.5.0) and the edge version of Community_Engine. I've started from scratch and gone through the installation instructions. When I attempt to start my server, I get this error: "Constant RAILS_END from rails_end.rb not found (NameError)". Problem is I cannot find rails_end.rb, nor can I find a google reference to this file or error. I've verified that the required gems are installed and current. I've dug around google and desert, but haven't found any reference to this constant. Any ideas? Thanks Here's my stack trace: => Booting Mongrel => Rails 2.3.2 application starting on http://0.0.0.0:3000 /opt/local/lib/ruby/gems/1.8/gems/desert-0.5.0/lib/desert/rails/ dependencies.rb:15:in `load_missing_constant': Constant RAILS_END from rails_end.rb not found (NameError) from /Users/dmr/.gem/ruby/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:80:in `const_missing' from /Users/dmr/.gem/ruby/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:92:in `const_missing' from /Users/dmr/dev/lionfold/config/environment.rb:32 from /Users/dmr/.gem/ruby/1.8/gems/rails-2.3.2/lib/ initializer.rb:111:in `run' from /Users/dmr/dev/myapp/config/environment.rb:31 from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/ custom_require.rb:31:in `gem_original_require' from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/ custom_require.rb:31:in `require' from /Users/dmr/.gem/ruby/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:156:in `require' from /Users/dmr/.gem/ruby/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:521:in `new_constants_in' from /Users/dmr/.gem/ruby/1.8/gems/activesupport-2.3.2/lib/ active_support/dependencies.rb:156:in `require' from /Users/dmr/.gem/ruby/1.8/gems/rails-2.3.2/lib/commands/ server.rb:84 from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/ custom_require.rb:31:in `gem_original_require' from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/ custom_require.rb:31:in `require' from script/server:3

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• Ruby on Rails DataTable now working.

  - by Nimroo

  [Ruby on Rails DataTable guide][1]https://github.com/phronos/rails_datatables/blob/master/README.md I"m following the above and have installed the git plugin as well. All i'm getting is the <%= datatable() % returning " <script type="text/javascript"> $(function() { $('#expenses').dataTable({ "oLanguage": { "sSearch": "Search", "sProcessing": 'Processing' }, "sPaginationType": "full_numbers", "iDisplayLength": 25, "bProcessing": true, "bServerSide": false, "bLengthChange": false, "bStateSave": true, "bFilter": true, "bAutoWidth": true, 'aaSorting': [[0, 'desc']], "aoColumns": [ { 'sType': 'html', 'bSortable':true, 'bSearchable':true ,'sClass':'first' },{ 'sType': 'html', 'bSortable':true, 'bSearchable':true },{ 'sType': 'html', 'bSortable':true, 'bSearchable':true },{ 'sType': 'string', 'bSortable':true, 'bSearchable':true ,'sClass':'last' } ], "fnServerData": function ( sSource, aoData, fnCallback ) { aoData.push( ); $.getJSON( sSource, aoData, function (json) { fnCallback(json); } ); } }); }); </script>". My .html.erb looks like this: <% @page_title="User Page"%> <link rel="stylesheet" href="http://code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css" /> <script src="http://code.jquery.com/jquery-1.8.3.js"></script> <script src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script> <%=javascript_include_tag "jquery.dataTables" %> <%=stylesheet_link_tag "jquery-ui-1.9.2.custom" %> <script> $(function() { $( "#tabs" ).tabs(); }); </script> <% if current_user %> <div id="tabs"> <ul> <li><a href="#tabs-1">Expenses</a></li> <li><a href="#tabs-2">Accountant</a></li> <li><a href="#tabs-3">Requests (<%[email protected]%>)</a></li> </ul> <div id="tabs-3"> <p> <% if @requests.count != 0 %> <h2> Accountant Requests </h2> <table > <tr> <thead> <th>First Name</th> <th>Last Name</th> <th>Email Address</th> <th>Accept</th> <th>Reject</th> </thead> </tr> <% @requests.each do |request| %> <tr> <td><%= request.accountant.first_name %></td> <td><%= request.accountant.last_name %></td> <td><%= request.accountant.email %></td> <td><%= link_to 'accept', confirm_accountant_path(:accountant_id => request.accountant_id) %></td> <td><%= link_to 'Edit', edit_expense_path(request) %></td> </tr> <% end %> </tbody> </table> <% else %> <h4> You have no pending requests <h4> <% end %> </p> </div> <div id="tabs-2"> <p> <% if @accountants.count != 0 %> <h2> Accountant Info </h2> <table> <tr> <th>First Name</th> <th>Last Name</th> <th>Email Address</th> </tr> <% @accountants.each do |accountant| %> <tr> <td><%= accountant.first_name %></td> <td><%= accountant.last_name %></td> <td><%= accountant.email %></td> </tr> <% end %> </table> <% else %> <h4> Add Accountant <h4> <p> You don't have an accountant yet, perhaps consider adding one by e-mail </p> <%= render 'add_accountant_form' %> <% end %> <% end %> </p> </div> <div id="tabs-1"> <p><% if current_user %> <h4> Submit new expense </h4> <%= render 'expenses/form' %> <% columns = [{:type => 'html', :class => "first"}, {:type => 'html'}, {:type => 'html'}, {:type => nil, :class => "last"}] %> <%= datatable(columns, {:sort_by => "[0, 'desc']", table_dom_id:"expenses" }) %> <table id="expenses" class="datatable"> <thead> <tr> <th>Entry Date</th> <th>Last Update</th> <th>Amount</th> <th>User</th> <th>Receipt</th> <th></th> <th></th> </tr> </thead> <% @expenses.each do |user_expense| %> <tbody> <tr> <td><%= user_expense.created_at %></td> <td><%= user_expense.updated_at %></td> <td><%= user_expense.amount %></td> <td><%= user_expense.user.username %></td> <% if !user_expense.receipt_img.nil? %> <td><%= image_tag user_expense.receipt_img.url(:thumb) %></td> <% else %> <td>Future Button Here</td> <% end %> <td><%= link_to 'Show', user_expense %></td> <td><%= link_to 'Edit', edit_expense_path(user_expense) %></td> </tr> </tbody> <% end %> </table> <% end %></p> </div> </div>

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• Is there a canonical resource on multi-tenancy web applications using ruby + rails

  - by AlexC

  Is there a canonical resource on multi-tenancy web applications using ruby + rails. There are a number of ways to develop rails apps using cloud capabilities with real elastic properties but there seems to be a lack of clarity with how to achieve multitenancy, specifically at the model / data level. Is there a canonical resource on options to developing multitenancy rails applications with the required characteristics of data seperation, security, concurrency and contention required by an enterprise level cloud application.

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• Best Ruby Git library?

  - by Jeff Welling

  Which is the best Git library in Ruby to use? Git, Grit, Rugged, Other? Background: I'm the current maintainer of TicGit-ng which is a distributed offline ticket system built on git, and I've read and heard over and over again that Grit is the one I should use because it supersedes the Git gem, but there seems to be either a lack of documentation or a lack of features because myself and others have failed in trying to switch from the deprecated-but-functional Git to the newer Grit gem.

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• What is the canonical resource on multi-tenancy web applications using ruby + rails

  - by AlexC

  What is the canonical resource on multi-tenancy web applications using ruby + rails. There are a number of ways to develop rails apps using cloud capabilities with real elastic properties but there seems to be a lack of clarity with how to achieve multitenancy, specifically at the model / data level. Is there a canonical resource on options to developing multitenancy rails applications with the required characteristics of data seperation, security, concurrency and contention required by an enterprise level cloud application.

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• Yahoo media player not working with Ruby on rails

  - by luca590

  I have a yahoo media player embedded in my webpage. I am currently using Ruby on Rails to create/edit my web page. When i click the play button next to a track the YMP waits a while and then goes to the next track without playing the first one. I then get a warning on my second (last) track that its file could not be found. Does anyone has a better recommendation for an audio player or a way to fix this one?

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• Gosu ruby windows no allocator for Image [on hold]

  - by user2812818

  I am trying to run the Gosu tutorial on Windows XP for ruby 1.93 It quits with `new': allocator undefined for Gosu::Image (TypeError) when trying to initialize a new Image: require 'gosu' require 'rubygems' class GameWindow < Gosu::Window def initialize super(640, 480, false) self.caption = "Gosu Tutorial Game" @background_image = Gosu::Image.new(self, "/media/123.bmp", true) end end I made sure the image is there and is png/bmp. I know it is something simple, maybe to do with the DLL's required? just not sure what.... thanks sgv

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• What is a practical way to debug Rails?

  - by Joshua Fox

  I get the impression that in practice, debuggers are rarely used for Rails applications. (Likewise for other Ruby apps, as well as Python.) We can compare this to the usual practice for Java or VisualStudio programmers--they use an interactive debugger in a graphical IDE. How do people debug Rails applications in practice? I am aware of the variety of debuggers, so no need to mention those, but do serious Rails programmers work without them? If so, why do you choose to do it this way? It seems to me that console printing has its limits when debugging complex logic.

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• Rails solution for mobile-specific content filter?

  - by Damien Roche

  To note, I'm not interested in simply 'hiding' content for mobile devices, I want to filter out that content completely. I'm also not trying to address the issue by building a mobile specific interface (mob.example.com). There was another question regarding something similar: How do I prevent useless content load on the page in responsive design? The solution, in that post, was to set a session during the initial request, and then use the session to filter content on subsequent requests. I primarily develop in Rails, and I'm wondering if there are any gems or ruby-specific solutions to this problem?

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• rails fake data, considering switch from faker to forgery, any advantages or pitfalls?

  - by Michael Durrant

  With Ruby on Rails I've usually used Forgery for generating dummy data for testing. I've noticed recently that several clients and tutorials are using Faker They both seem fairly similar in use and popularity: Faker 128 forks, 418 watchers. Forgery 59 forks, 399 watchers. They both seem similar in how current they are: Faker Most updates are from 6 and 9 months ago. Forgery Most updates are from 4 and 9 months ago. The one distinguishing factor I've found so far is that Forgery seems like it has better instructions. Are there any particular benefits or disadvantages to using one over the other? Have you ever needed to switch from one to another for a particular reason?

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• git push >> fatal: no configured push destination

  - by Marc

  I'm still going through some guides on RoR and i'm stuck here at "Deploying the demo app" I followed instructions: " With the completion of microposts resources, now is a good time to push the repository up to GitHub: " $ git add . $ git commit -a -m "Finish demo app" $ git push What happened wrong here was the push part.. it outputted this: $ git push fatal: No configured push destination. Either specify the URL from the command-line or configure a remote repository using git remote add < name < url git push < name So i tried following the insturctions by doing this command: $git remote add demo_app 'www.github.com/levelone/demo_app' fatal: remote demo_app already exists. So i push: $git push demo_app fatal: 'www.github.com/levelone/demo_app' does not appear to be a git repository fatal: The remote end hung up unexpectedly What can i do here? Any help would be much appreciated. -Marc

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• Bundler isn't loading gems

  - by Garrett

  I have been having a problem with using Bundler and being able to access my gems without having to require them somewhere, as config.gem used to do that for me (as far as I know). In my Rails 3 app, I defined my Gemfile like so: clear_sources source "http://gemcutter.org" source "http://gems.github.com" bundle_path "vendor/bundler_gems" ## Bundle edge rails: git "git://github.com/rails/arel.git" git "git://github.com/rails/rack.git" gem "rails", :git => "git://github.com/rails/rails.git" ## Bundle gem "mongo_mapper", :git => "git://github.com/jnunemaker/mongomapper.git" gem "bluecloth", ">= 2.0.0" Then I run gem bundle, it bundles it all up like expected. Inside the environment.rb file that is included within boot.rb it looks like this: # DO NOT MODIFY THIS FILE module Bundler file = File.expand_path(__FILE__) dir = File.dirname(file) ENV["PATH"] = "#{dir}/../../../../bin:#{ENV["PATH"]}" ENV["RUBYOPT"] = "-r#{file} #{ENV["RUBYOPT"]}" $LOAD_PATH.unshift File.expand_path("#{dir}/gems/builder-2.1.2/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/builder-2.1.2/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/text-hyphen-1.0.0/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/text-hyphen-1.0.0/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/i18n-0.3.3/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/i18n-0.3.3/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/arel/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/arel/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/activemodel/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/activemodel/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/jnunemaker-validatable-1.8.1/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/jnunemaker-validatable-1.8.1/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/abstract-1.0.0/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/abstract-1.0.0/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/erubis-2.6.5/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/erubis-2.6.5/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/mime-types-1.16/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/mime-types-1.16/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/mail-2.1.2/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/mail-2.1.2/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/rake-0.8.7/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/rake-0.8.7/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/railties/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/railties/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/memcache-client-1.7.7/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/memcache-client-1.7.7/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rack/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rack/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/rack-test-0.5.3/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/rack-test-0.5.3/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/rack-mount-0.4.5/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/rack-mount-0.4.5/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/actionpack/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/actionpack/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/bluecloth-2.0.7/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/bluecloth-2.0.7/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/bluecloth-2.0.7/ext") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/activerecord/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/activerecord/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/text-format-1.0.0/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/text-format-1.0.0/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/actionmailer/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/actionmailer/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/tzinfo-0.3.16/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/tzinfo-0.3.16/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/activesupport/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/activesupport/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/activeresource/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/activeresource/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/rails/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/mongo-0.18.2/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/gems/mongo-0.18.2/lib") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/mongomapper/bin") $LOAD_PATH.unshift File.expand_path("#{dir}/dirs/mongomapper/lib") @gemfile = "#{dir}/../../../../Gemfile" require "rubygems" unless respond_to?(:gem) # 1.9 already has RubyGems loaded @bundled_specs = {} @bundled_specs["builder"] = eval(File.read("#{dir}/specifications/builder-2.1.2.gemspec")) @bundled_specs["builder"].loaded_from = "#{dir}/specifications/builder-2.1.2.gemspec" @bundled_specs["text-hyphen"] = eval(File.read("#{dir}/specifications/text-hyphen-1.0.0.gemspec")) @bundled_specs["text-hyphen"].loaded_from = "#{dir}/specifications/text-hyphen-1.0.0.gemspec" @bundled_specs["i18n"] = eval(File.read("#{dir}/specifications/i18n-0.3.3.gemspec")) @bundled_specs["i18n"].loaded_from = "#{dir}/specifications/i18n-0.3.3.gemspec" @bundled_specs["arel"] = eval(File.read("#{dir}/specifications/arel-0.2.pre.gemspec")) @bundled_specs["arel"].loaded_from = "#{dir}/specifications/arel-0.2.pre.gemspec" @bundled_specs["activemodel"] = eval(File.read("#{dir}/specifications/activemodel-3.0.pre.gemspec")) @bundled_specs["activemodel"].loaded_from = "#{dir}/specifications/activemodel-3.0.pre.gemspec" @bundled_specs["jnunemaker-validatable"] = eval(File.read("#{dir}/specifications/jnunemaker-validatable-1.8.1.gemspec")) @bundled_specs["jnunemaker-validatable"].loaded_from = "#{dir}/specifications/jnunemaker-validatable-1.8.1.gemspec" @bundled_specs["abstract"] = eval(File.read("#{dir}/specifications/abstract-1.0.0.gemspec")) @bundled_specs["abstract"].loaded_from = "#{dir}/specifications/abstract-1.0.0.gemspec" @bundled_specs["erubis"] = eval(File.read("#{dir}/specifications/erubis-2.6.5.gemspec")) @bundled_specs["erubis"].loaded_from = "#{dir}/specifications/erubis-2.6.5.gemspec" @bundled_specs["mime-types"] = eval(File.read("#{dir}/specifications/mime-types-1.16.gemspec")) @bundled_specs["mime-types"].loaded_from = "#{dir}/specifications/mime-types-1.16.gemspec" @bundled_specs["mail"] = eval(File.read("#{dir}/specifications/mail-2.1.2.gemspec")) @bundled_specs["mail"].loaded_from = "#{dir}/specifications/mail-2.1.2.gemspec" @bundled_specs["rake"] = eval(File.read("#{dir}/specifications/rake-0.8.7.gemspec")) @bundled_specs["rake"].loaded_from = "#{dir}/specifications/rake-0.8.7.gemspec" @bundled_specs["railties"] = eval(File.read("#{dir}/specifications/railties-3.0.pre.gemspec")) @bundled_specs["railties"].loaded_from = "#{dir}/specifications/railties-3.0.pre.gemspec" @bundled_specs["memcache-client"] = eval(File.read("#{dir}/specifications/memcache-client-1.7.7.gemspec")) @bundled_specs["memcache-client"].loaded_from = "#{dir}/specifications/memcache-client-1.7.7.gemspec" @bundled_specs["rack"] = eval(File.read("#{dir}/specifications/rack-1.1.0.gemspec")) @bundled_specs["rack"].loaded_from = "#{dir}/specifications/rack-1.1.0.gemspec" @bundled_specs["rack-test"] = eval(File.read("#{dir}/specifications/rack-test-0.5.3.gemspec")) @bundled_specs["rack-test"].loaded_from = "#{dir}/specifications/rack-test-0.5.3.gemspec" @bundled_specs["rack-mount"] = eval(File.read("#{dir}/specifications/rack-mount-0.4.5.gemspec")) @bundled_specs["rack-mount"].loaded_from = "#{dir}/specifications/rack-mount-0.4.5.gemspec" @bundled_specs["actionpack"] = eval(File.read("#{dir}/specifications/actionpack-3.0.pre.gemspec")) @bundled_specs["actionpack"].loaded_from = "#{dir}/specifications/actionpack-3.0.pre.gemspec" @bundled_specs["bluecloth"] = eval(File.read("#{dir}/specifications/bluecloth-2.0.7.gemspec")) @bundled_specs["bluecloth"].loaded_from = "#{dir}/specifications/bluecloth-2.0.7.gemspec" @bundled_specs["activerecord"] = eval(File.read("#{dir}/specifications/activerecord-3.0.pre.gemspec")) @bundled_specs["activerecord"].loaded_from = "#{dir}/specifications/activerecord-3.0.pre.gemspec" @bundled_specs["text-format"] = eval(File.read("#{dir}/specifications/text-format-1.0.0.gemspec")) @bundled_specs["text-format"].loaded_from = "#{dir}/specifications/text-format-1.0.0.gemspec" @bundled_specs["actionmailer"] = eval(File.read("#{dir}/specifications/actionmailer-3.0.pre.gemspec")) @bundled_specs["actionmailer"].loaded_from = "#{dir}/specifications/actionmailer-3.0.pre.gemspec" @bundled_specs["tzinfo"] = eval(File.read("#{dir}/specifications/tzinfo-0.3.16.gemspec")) @bundled_specs["tzinfo"].loaded_from = "#{dir}/specifications/tzinfo-0.3.16.gemspec" @bundled_specs["activesupport"] = eval(File.read("#{dir}/specifications/activesupport-3.0.pre.gemspec")) @bundled_specs["activesupport"].loaded_from = "#{dir}/specifications/activesupport-3.0.pre.gemspec" @bundled_specs["activeresource"] = eval(File.read("#{dir}/specifications/activeresource-3.0.pre.gemspec")) @bundled_specs["activeresource"].loaded_from = "#{dir}/specifications/activeresource-3.0.pre.gemspec" @bundled_specs["rails"] = eval(File.read("#{dir}/specifications/rails-3.0.pre.gemspec")) @bundled_specs["rails"].loaded_from = "#{dir}/specifications/rails-3.0.pre.gemspec" @bundled_specs["mongo"] = eval(File.read("#{dir}/specifications/mongo-0.18.2.gemspec")) @bundled_specs["mongo"].loaded_from = "#{dir}/specifications/mongo-0.18.2.gemspec" @bundled_specs["mongo_mapper"] = eval(File.read("#{dir}/specifications/mongo_mapper-0.6.10.gemspec")) @bundled_specs["mongo_mapper"].loaded_from = "#{dir}/specifications/mongo_mapper-0.6.10.gemspec" def self.add_specs_to_loaded_specs Gem.loaded_specs.merge! @bundled_specs end def self.add_specs_to_index @bundled_specs.each do |name, spec| Gem.source_index.add_spec spec end end add_specs_to_loaded_specs add_specs_to_index def self.require_env(env = nil) context = Class.new do def initialize(env) @env = env && env.to_s ; end def method_missing(*) ; yield if block_given? ; end def only(*env) old, @only = @only, _combine_only(env.flatten) yield @only = old end def except(*env) old, @except = @except, _combine_except(env.flatten) yield @except = old end def gem(name, *args) opt = args.last.is_a?(Hash) ? args.pop : {} only = _combine_only(opt[:only] || opt["only"]) except = _combine_except(opt[:except] || opt["except"]) files = opt[:require_as] || opt["require_as"] || name files = [files] unless files.respond_to?(:each) return unless !only || only.any? {|e| e == @env } return if except && except.any? {|e| e == @env } if files = opt[:require_as] || opt["require_as"] files = Array(files) files.each { |f| require f } else begin require name rescue LoadError # Do nothing end end yield if block_given? true end private def _combine_only(only) return @only unless only only = [only].flatten.compact.uniq.map { |o| o.to_s } only &= @only if @only only end def _combine_except(except) return @except unless except except = [except].flatten.compact.uniq.map { |o| o.to_s } except |= @except if @except except end end context.new(env && env.to_s).instance_eval(File.read(@gemfile), @gemfile, 1) end end module Gem @loaded_stacks = Hash.new { |h,k| h[k] = [] } def source_index.refresh! super Bundler.add_specs_to_index end end But when I try to access any of my gems, e.g. MongoMapper, Paperclip, Haml, etc. I get: NameError: uninitialized constant MongoMapper The same goes for any other gem. Does Bundler not include gems like the old Rails 2.0 did? Or is something messed up with my system? Any help would be appreciated, thank you!

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• Rails 3 and RJS

  - by Denis

  Hi, I use the rails 3.0.0.beta Is there any new syntax to write RJS, here is an example def remote_create @photo = Photo.new(params[:photo]) respond_to do |format| if @photo.save # add @photo's thumbnail to last import tag format.js { render :update do |page| page.insert_html :bottom, 'polaroids' , :partial => 'polaroid', :locals => {:photo => @photo} end } else #... end end end

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• Problem running Thinking Sphinx with Rails 2.3.5

  - by benoror

  Hi, I just installed Sphinx (distro: archlinux) downloading the source. Then I installed "Thinking Sphinx" plugin for Rails. I followed the official page setup and this Screencast from Ryan Bates, but when I try to index the models it gives me this error: $ rake thinking_sphinx:index (in /home/benoror/Dropbox/Proyectos/cotizahoy) Sphinx cannot be found on your system. You may need to configure the following settings in your config/sphinx.yml file: * bin_path * searchd_binary_name * indexer_binary_name For more information, read the documentation: http://freelancing-god.github.com/ts/en/advanced_config.html Generating Configuration to /home/benoror/Dropbox/Proyectos/cotizahoy/config/development.sphinx.conf sh: indexer: command not found I tried starting the daemon manually (/usr/bin/sphinx-searchd), changing the config/sphinx.yml file: devlopment: searchd_binary_name: sphinx-searchd indexer_binary_name: sphinx-indexer But it shows the same error, any ideas ?

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• How can I get ambethia's captcha plugin to work in rails 3?

  - by James

  I have installed ambethia's captcha plugin as a plugin in my rails 3 app. When I put the <%= recaptcha_tags %> in my view, it puts this on the page: <script type="text/javascript" src="http://api.recaptcha.net/challenge?k=my_key&error=expression"></script> <noscript> <iframe src="http://api.recaptcha.net/noscript?k=my_other_key" height="300" width="500" frameborder="0"></iframe><br/> <textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea> <input type="hidden" name="recaptcha_response_field" value="manual_challenge"></noscript> Is there a way that I can make this work in rails 3? I'd appreciate any help.

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• Start or ensure that Delayed Job runs when an application/server restarts.

  - by btelles

  Hi there, We have to use delayed_job (or some other background-job processor) to run jobs in the background, but we're not allowed to change the boot scripts/boot-levels on the server. This means that the daemon is not guaranteed to remain available if the provider restarts the server (since the daemon would have been started by a capistrano recipe that is only run once per deployment). Currently, the best way I can think of to ensure the delayed_job daemon is always running, is to add an initializer to our Rails application that checks if the daemon is running. If it's not running, then the initializer starts the daemon, otherwise, it just leaves it be. The question, therefore, is how do we detect that the Delayed_Job daemon is running from inside a script? (We should be able to start up a daemon fairly easily, bit I don't know how to detect if one is already active). Anyone have any ideas? Regards, Bernie Based on the answer below, this is what I came up with. Just put it in config/initializers and you're all set: #config/initializers/delayed_job.rb DELAYED_JOB_PID_PATH = "#{Rails.root}/tmp/pids/delayed_job.pid" def start_delayed_job Thread.new do `ruby script/delayed_job start` end end def process_is_dead? begin pid = File.read(DELAYED_JOB_PID_PATH).strip Process.kill(0, pid.to_i) false rescue true end end if !File.exist?(DELAYED_JOB_PID_PATH) && process_is_dead? start_delayed_job end

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• Rails Counter Cache and its implementation

  - by Ishu

  Hello All, I am trying to get hold of rails counter cache feature but not able to grasp it completely. Let's say that We have 3 models A B C A belongs to B or C depending upon a field key_type and key_id. key_type tells whether A belongs to B or C so if key_type="B" then the record belongs to B otherwise it belongs to C. In my model a.rb, I have defined following associations: belongs_to :b, :counter_cache => true, :foreign_key => "key_id" belongs_to :c, :counter_cache => true, :foreign_key => "key_id" and in b and c model files has_many :as , :conditions => {:key_type => "B"} has_many :as , :conditions => {:key_type => "C"} Both B and C Models have a column as as_count The problem is every time an object of a is created count is increased in the both the models b and c. Any help is appreciated. Initially i thought that this may work: belongs_to :b, :counter_cache => true, :foreign_key => "key_id", :conditions => {:key_type => "B"} belongs_to :c, :counter_cache => true, :foreign_key => "key_id", :conditions => {:key_type => "C"} But this does not help. Thanks

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• Is reading xml simple in rails or converting it to hash will be simpler?

  - by Salil

  Hi All, Sorry for this question but after spending 1-2 hours on how to read xml, i thought posting it on forum will be better. So i get a complex (very large)xml response from the plugin trackify. i want to read some values form it so i covert it into hash and then read it as follows For ex:- to read city @tracking_info['TrackResponse']['Shipment']['ShipTo']['Address']['City'] #>> "SEATTLE" my question is it proper way to getting xml response or there are some xml methods which is simple to use?

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• Per-User basis security with restful_authentication in Rails ?

  - by benoror

  Hi! I'm using restful_authentication plugin, but I would like to have per-user security, for example: class PostsController < ApplicationController # Login required before_filter :login_required, :except => [ :index, :show ] # Only the same user can create, edit and delete their own posts before_filter :only_by_same_user, :only => [ :create, :update, :destroy ] end Thanks!

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• Can't store array in json field in postgresql (rails) can't cast Array to json

  - by Drew H

  This is the error I'm getting when I run db:migrate rake aborted! can't cast Array to json This is my table class CreateTrips < ActiveRecord::Migration def change create_table :trips do |t| t.json :flights t.timestamps end end end This is in my seeds.rb file flights = [{ depart_time_hour: 600, arrive_time_hour: 700, passengers: [ { user_id: 1, request: true } ] }] trip = Trip.create( { name: 'Flight', flights: flights.to_json } ) For some reason I can't do this. If I do this. trip = Trip.create( { name: 'Flight', flights: { flights: flights.to_json } } ) It works. I don't want this though because now I have to access the json array with trip.flights.flights. Not the behavior I'm wanting.

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• Rails. How to extend controller class from plugin without any modification in controller file?

  - by potapuff

  I'm use Rails 2.2.2. Rails manual said, the way to extend controller from plug-in is: Plugin: module Plug def self.included(base) base.extend ClassMethods base.send :include, InstanceMethods base.helper JumpLinksHelper end module InstanceMethods def new_controller_metod ... end end module ClassMethods end end app/controller/name_controller.rb class NameController < ApplicationController include Plug ... end Question: is any way to extend controller from plug-in, without any modification of controller file, if we know controller name.

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• rails foreman does not load all my services on start

  - by Rubytastic

  Rails foreman does not load all my services defined in Procfile. Procfile.rb: redis: redis-server resque: bundle exec rake resque:start &&> log/resque_worker_queue.log privpub: bundle exec rackup private_pub.ru -s thin -E production & &> log/private_pub.log sunspot: bundle exec rake sunspot:solr:run I always have to manually start all of them by copy paste the commands in terminal foreman start does not work, what am i missing? This is foreman output: 12:35:40 privpub.1 | process terminated 12:35:40 system | sending SIGTERM to all processes 12:35:40 system | sending SIGTERM to pid 4375 12:35:40 redis.1 | [4375] 02 Jun 12:35:40 # Received SIGTERM, scheduling shutdown... 12:35:40 redis.1 | [4375] 02 Jun 12:35:40 # User requested shutdown... 12:35:40 redis.1 | [4375] 02 Jun 12:35:40 * Saving the final RDB snapshot before exiting. 12:35:40 redis.1 | [4375] 02 Jun 12:35:40 * DB saved on disk 12:35:40 redis.1 | [4375] 02 Jun 12:35:40 # Redis is now ready to exit, bye bye... 12:35:40 system | sending SIGTERM to pid 4376 12:35:40 resque.1 | rake aborted! 12:35:40 resque.1 | SIGTERM 12:35:40 resque.1 | 12:35:40 resque.1 | (See full trace by running task with --trace) 12:35:40 system | sending SIGTERM to pid 4378 12:35:40 sunspot.1 | rake aborted! 12:35:40 sunspot.1 | SIGTERM 12:35:40 sunspot.1 | 12:35:40 sunspot.1 | (See full trace by running task with --trace) 12:35:40 sunspot.1 | process terminated 12:35:40 resque.1 | process terminated 12:35:40 redis.1 | process terminated

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