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  • rails restful select_tag with :on_change

    - by Sam
    So I'm finally starting to use rest in rails. I want to have a select_tag with product categories and when one of the categories is selected I want it to update the products on change. I did this before with <% form_for :category, :url => { :action => "show" } do |f| %> <%= select_tag :id, options_from_collection_for_select(Category.find(:all), :id, :name), { :onchange => "this.form.submit();"} %> <% end %> however now it doesn't work because it tries to do the show action. I have two controllers 1) products 2) product_categories products belongs_to product_categories with a has_many How should I do this. Since the products are listed on the products controller and index action should I use the products controller or should I use the product_categories controller to find the category such as in the show action and then render the product/index page. But the real problem I have is how to get this form or any other option to work with restful routes.

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  • Rails - column not found for defined 'has_many' relationship

    - by Guanlun
    I define a Post class which can link or be linked to multiple posts. To do this I added a PostLink class which specifies post_to and post_from. I generated the PostLink class by rails g model post_link from_post:integer to_post:integer and of course rake db:migrate, and added belongs_to :from_post, :class_name => 'Post' belongs_to :to_post, :class_name => 'Post' to the class. And I also have has_many :post_links in my Post class. I ran rails console and Post.new.post_links and got nil printed out, which is expected. However after I save a Post using p = Post.new p.save and then run p.post_links, it prints out the following error message: SQLite3::SQLException: no such column: post_links.post_id: SELECT "post_links".* FROM "post_links" WHERE "post_links"."post_id" = 1 So anybody know why after saving it to the database post_link can not be accessed?

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  • How to stop auto encoding of <%= strings %> with Rails 3.0beta

    - by christophercotton
    I'm using rails 3.0beta3. In my index.html.erb and in my index.js.erb, if I have: <%= "string with unsafe characters' like <" %> It will automatically be encoded to: string with unsafe characters&quot; like &amp; just the same as if I had used: <%=h "string with unsafe characters' like <" %> How do I get it to stop? I have stored some short bits of JavaScript that I need to insert into the template without it automatically encoding the string?

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  • Why is my ruby application running faster the second time?

    - by Omega
    I'm creating a Ruby game using the Gosu framework. All good. Sometimes, when I run the game, it has some kind of slow startup, and probably it will be rather slow during the whole game. So I close it and... open it again. It is very likely that it will startup quickly and the whole game will run smoothly and fast. Why is that? What is this phenomenon? Is it faster because of some cache stored or whatever since the first run? (But why would cache be stored? If the app dies, I would expect no references at all etc...) Ruby, Windows 7.

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  • Amazon Web Services : mise à jour de l'environnement Linux, avec les dernières versions de MySQL, Python, Ruby et le Kernel 3.2

    Amazon Web Services : mise à jour de l'environnement Linux avec les dernières versions de MySQL, Python, Ruby et le Kernel Linux 3.2 Amazon Web Services (AWS) vient de procéder à une mise à jour majeure d'Amazon Linux AMI. L'image du système d'exploitation Linux qui s'exécute sur la plateforme intègre désormais les versions les plus récentes de TomCat, MySQL, Python, GCC, Ruby, etc. Cette version a été construite avec pour objectif principal de permettre aux entreprises de migrer ou de rester sur les anciennes versions des outils. Ainsi, les organismes peuvent exécuter différentes versions majeures des applications et langages de programmation. Ceci permet au code qui s'appuie su...

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  • rails server fails to start with mysql2 using rvm & ruby 1.9.2-p0 on OSX 10.6.5

    - by Scott
    I'm getting the following error when I start rails server: $ rails server /Users/ssmith/.rvm/gems/ruby-1.9.2-p0/gems/mysql2-0.2.6/lib/mysql2.rb:7:in `require': dlopen(/Users/ssmith/.rvm/gems/ruby-1.9.2-p0/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.16.dylib (LoadError) Referenced from: /Users/ssmith/.rvm/gems/ruby-1.9.2-p0/gems/mysql2- 0.2.6/lib/mysql2/mysql2.bundle Reason: image not found - /Users/ssmith/.rvm/gems/ruby-1.9.2-p0/gems/mysql2- 0.2.6/lib/mysql2/mysql2.bundle I've installed mysql2 with the following command after the rvm use ruby-1.9.2-p0 command: $ gem install mysql2 -- --with-mysql-dir=/usr/local/mysql --with-mysql-config=/usr/local/mysql/bin/mysql_config Building native extensions. This could take a while... Successfully installed mysql2-0.2.6 1 gem installed Installing ri documentation for mysql2-0.2.6... Enclosing class/module 'mMysql2' for class Client not known Installing RDoc documentation for mysql2-0.2.6... Enclosing class/module 'mMysql2' for class Client not known I have mysql2 in my Gemfile as well as in the database.yml file and bundle install completes fine $ bundle show mysql2 /Users/ssmith/.rvm/gems/ruby-1.9.2-p0/gems/mysql2-0.2.6 I understand the rails server error is due to it not knowing the mysql_config location on OSX, however on gem install I specified the correct location. Yet RVM's gem is not respecting that mysql_config location it seems. Anyone have a solution to this? Thanks in advance. Scott

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  • export to csv using fastercsv and CSV::Writer (Ruby on Rails)

    - by Venkat
    What am I trying to do: export data to csv. I have a form which allows user to select the format (from a drop down menu). So based on the selection of the format the ouput is displayed using a ajax call. Works fine for html but when I select the format as csv I don't see any pop up on the screen (asking to save or open the file) and neither any file gets downloaded directly. I tried using Fastercsv (but the problem is that I don't see any pop up asking me whether I want to save or open the file) and CSV::Writer where I get this error message on the console. NoMethodError (You have a nil object when you didn't expect it! The error occurred while evaluating nil.bytesize): actionpack (2.3.4) lib/action_controller/streaming.rb:142:in `send_data' Code using Fastercsv: def export_to_csv csv_string = FasterCSV.generate(:col_sep => ",") do |csv| members = ["Versions / Project Members"] members_selected.each {|member| members << Stat.member_name(member)} Stat.project_members(project).each {|user| members << user.name} csv << ["some text", "text 2", "text 3"] end return csv_string end and this is how I am sending the data: send_data(export_to_csv,:type => 'text/csv; charset=iso-8859-1; header=present', :disposition => "attachment", :filename => "filename.csv") I see the response as "some text, text 2, text 3" in the firebug console but no pop up asking whether I want to save or open the file. This is what I am doing using CSV::Writer: def export_to_csv report = StringIO.new CSV::Writer.generate(report, ',') do |csv| csv << ['c1', 'c2'] end end and call it as: send_data(export_to_csv,:type => 'text/csv; charset=iso-8859-1; header=present', :disposition => "attachment", :filename => "filename.csv") This is the error which is thrown on the console: NoMethodError (You have a nil object when you didn't expect it! The error occurred while evaluating nil.bytesize): actionpack (2.3.4) lib/action_controller/streaming.rb:142:in `send_data'

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  • How can I make Ruby rake display the full backtrace on uncaught exception

    - by Martinos
    As you may know rake swallows the full backtrace on uncaught exception. If I want to have a full backtrace, I need to add the --trace option. I find this very annoying because some of my tasks take long time to run (up to 6 hours), when it crashes I don't have any debugging info. I need to run it again with the --trace. On top of that, the system may not be in the same state as when the error occurred, so it may not show afterward. I always have to add --trace on any tasks. This displasy stuff that I don't want to see when the task is executed. Is there a way to change this default behaviour? (which I don't think is useful at all)

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  • How to get id of the saved record in Ruby on Rails

    - by railsnew
    I am doing this from the console but I'd like to do this in my code too. Basically I am trying to add a record to the table and then get the id back. >> @record = Physician.create(:pname => "someone2") => #<Physician id: nil, pname: "someone2", pgroup: nil, created_at: nil, updated_at: nil, userid: nil, storeid: nil, licexpdate: nil, address: nil> >> @record.save => false >>

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  • Nokogiri (Ruby) and XPath

    - by JP
    Does Nokogiri only support XPath 1.0? I'm trying to do simple string replacement in a value-of cell, like so (where element contains something like '* My string (useless text)') <xsl:value-of select="replace(element,'^\*\ (.+)\ \(.*\)$','\\1')"> Is this poorly formed XSL? Or is there a limitation with Nokogiri?

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  • Ruby on Rails AJAX call affects only the first element in collection

    - by pruett
    I'm iterating over a collection of elements and trying to get AJAX to work properly on a specific element within the collection. I'm nesting a few partials in order to iterate over these items and use a js.erb call like this: $('#favorite_form').html("<%=j render partial: 'shared/unfavorite', locals: { mission: @mission } %>"); This only seems to change the 1st item in the collection even though I could be clicking the 5th item down the list, for example. Question: How can I specify (via .js and AJAX) which element to update? Is this jQuery call not specific enough to the individual element? The code works in regular HTTP requests, so I'm wondering if there is a way to specify the individual element, but I thought that's what partials did :/ Example View ( _favorites.html.erb ) <div id="favorite_form"> <% if you_favorited_this?(current_user, mission) %> <%= render partial: 'shared/unfavorite', locals: { mission: mission } %> <% else %> <%= render partial: 'shared/favorite', locals: { mission: mission } %> <% end %> </div>

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  • mongrel not working - Ruby on Rails

    - by Steven
    I have deployed my rails app to a live server(linux) and I have successfully installed the the mongrel gems, and I can successfully start the server for my app but when i try to acceess the website on the server i get the error The server at 196.xx.xxx.xx is taking too long to respond. Is there anything i need to do to be able to access my app on the browser? Mongrel Logs ** Starting Rails with production environment... ** Rails loaded. ** Loading any Rails specific GemPlugins ** Signals ready. TERM = stop. USR2 = restart. INT = stop (no restart). ** Rails signals registered. HUP = reload (without restart). It might not work well. ** Mongrel 1.1.5 available at 0.0.0.0:3001 ** Writing PID file to /home/xxxxxxx.co.za/shared/log/mongrel.pid

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  • ruby on rails photo upload problem

    - by dodo00700
    Hallo rails version 2.3.5 I'm learning rails and I run into a problem. I'm doing some nesting forms from the railscasts tutorials. I changed the text area into a data field to upload photos and everything is working. Now i have to display the uploaded pictures and i simply can't do it. I Tried everything I could find on the net but nothing worked. PROBLEM I have the Article controller which handles the article CRUD. inside the article new form there is nested a form for uploading images. article controller def code_image @image_data = Photo.find(params[:id]) @image = @image_data.binary_data send_data(@image, :type => @image_data.content_type, :filename => @image_data.filename, :disposition => 'inline') end photo model def image_file=(input_data) self.filename = input_data.original_filename self.content_type = input_data.content_type.chomp self.binary_data = input_data.read end articles/show.html.erb <%=h @article.title %> <%=h @article.body %> <% for photos in @article.photos %> <%= image_tag(url_for({:action => 'code_image', :id => @article.photos.id})) -%> <% end %> articles/_formnew.html.erb <% form_for (:article, @article, :url => {:action=>'create'}, :html=> {:multipart=>true}) do |f| %> <%= f.error_messages % <%= f.label :title %><br /> <%= f.text_field :title %><br /><br /> <%= f.label :body %><br /> <%= f.text_area :body, :style => 'width: 600px;' %><br /><br /> <% f.fields_for :photos do |builder|%> <%= builder.label :content, "Photo"%><br /> <%= builder.file_field :image_file %><br /> <% end %> <br /> <%= f.submit "Create" %> <% end % Thanks

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  • Free Certification Exams for Visual Studio 2010

    - by budugu
    Get promotional codes from herehttp://blogs.msdn.com/gerryo/archive/2010/03/17/register-for-visual-studio-2010-beta-exams.aspx You don’t have to pay anything to take these exams.  These are 100% free. If you pass the exam, you earn the certification just the same as if you took it in a non-beta environment. From Gerry O'Brien’s blog...  2) Is this a real exam? – Yes it is.  Even though the questions are not scored at the time you take the exam, they are real questions and the exam is real.  If you pass the exam, you earn the certification just the same as if you took it in a non-beta environment.  This means you don’t get a pass/fail or score immediately following the exam, but you do get notified 8 to 10 weeks later because we move slow in getting the final scoring in place.  4) What is the main difference between a beta and non-beta exam, besides cost? – The beta exam will show you questions that have not been through a final QA check.  You are that final QA check.  Non-beta exams expose you to 40 or 45 questions and you have a total of two hours to complete it.  The beta exam could expose you to as many as 125 to 150 questions and take up to four hours.   Following exams are for Asp.Net developers Exam 71-515, TS: Web Applications Development with Microsoft .NET Framework 4Exam 71-519: Pro: Designing and Developing Web Applications Using Microsoft .NET Framework 4

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  • How would you manage development between many Staging branches?

    - by Trip
    We have a Staging Branch. then we came out with a Beta branch for users to move whenever they wanted to from old Production branch to the new features. Our plan seemed simple, we test on Staging, when items get QA'd, they get cherry-picked and deploy to Beta. Here's the problem! A bug will discreetly make its way on to Beta, and since Beta is a production environment, it needs fixes fast and accurate. But not all the QA's got done. Enter Git hell.. So I find a problem on Beta. No sweat, its already been fixed on Staging, but when I go to cherry-pick the item over, Beta barely has any of the other pre-requisites of code to implement this small change. Now Beta has a little here and a little there, and I can't imagine it as a code base being as stable as Staging. What's more, is I'm dealing with some insane Git conflicts, and having to monkey patch a bunch of things to make up for what Beta hasn't caught up with Staging. Can someone polite or non-polite terms, tell me what we're doing wrong here as far as assembling this project? Any awesome recommendations or workarounds or alternatives to the system we came up with?

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  • 5 Steps to getting started with IronRuby

    - by Eric Nelson
    IronRuby is a Open Source implementation of the Ruby programming language for .NET, heavily relying on Microsoft's Dynamic Language Runtime. The project's #1 goal is to be a true Ruby implementation, meaning it runs existing Ruby code. Check out this summary of using the Ruby standard library and 3rd party libraries in IronRuby. IronRuby has tight integration with .NET, so any .NET types can be used from IronRuby and the IronRuby runtime can be embedded into any .NET application. These 5 steps should get you nicely up and running on IronRuby – OR … you could just watch a video session from the lead developer which took place earlier this month (March 2010 - 60mins). But the 5 steps will be quicker :-) Step 1 – Install IronRuby :-) You can install IronRuby automatically using an MSI or manually. For simplicity I would recommend the MSI install. TIP: As of the 25th of March IronRuby has not quite shipped. The download above is a Release Candidate (RC) which means it is still undergoing final testing by the team. You will need to uninstall this version (RC3) once the final release is available. The good news is that uninstalling IronRuby RC3 will work without a hitch as the MSI does relatively little. Step 2 – Install an IronRuby friendly editor You will need to Install an editor to work with IronRuby as there is no designer support for IronRuby inside Visual Studio. There are many editors to choose from but I would recommend you either went with: SciTE (Download the MSI): This is a lightweight text editor which is simple to get up and running. SciTE understands Ruby syntax and allows you to easily run IronRuby code within the editor with a small change to the config file. SharpDevelop 3.2 (Download the MSI): This is an open source development environment for C#, VB, Boo and now IronRuby. IronRuby support is new but it does include integrated debugging. You might also want to check out the main site for SharpDevelop. TIP: There are commercial tools for Ruby development which offer richer support such as intellisense.. They can be coerced into working with IronRuby. A good one to start with is RubyMine which needs some small changes to make it work with IronRuby. Step 3 – Run the IronRuby Tutorial Run through the IronRuby tutorial which is included in the IronRuby download. It covers off the basics of the Ruby languages and how IronRuby integrates with .NET. In a typical install it will end up at C:\Program Files\IronRuby 0.9.4.0\Samples\Tutorial. Which will give you the tutorial implemented in .NET and Ruby. TIP: You might also want to check out these two introductory posts Using IronRuby and .NET to produce the ‘Hello World of WPF’ and What's IronRuby, and how do I put it on Rails? Step 4 – Get some good books to read Get a great book on Ruby and IronRuby. There are several free ebooks on Ruby which will help you learn the language. The little book of Ruby is a good place to start. I would also recommend you purchase IronRuby Unleashed (Buy on Amazon UK | Buy on Amazon USA). You might also want to check out this mini-review. Other books are due out soon including IronRuby in Action. TIP: Also check out the official documentation for using .NET from IronRuby. Step 5 – Keep an eye on the team blogs Keep an eye on the IronRuby team blogs including Jimmy Schementi, Jim Deville and Tomas Matousek (full list) TIP: And keep a watch out for the final release of IronRuby – due anytime soon!

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  • Incremental RPM package version "numbers" for x.y.z > x.y.z-beta (or alpha, rc, etc)

    - by Jonathan Clarke
    In order to publish RPM packages of several different versions of some software, I'm looking for a way to specify version "numbers" that are considered "upgrades", and include the differentiation of several pre-release versions, such as (in order): "2.4.0 alpha 1", "2.4.0 alpha 2", "2.4.0 alpha 3", "2.4.0 beta 1", "2.4.0 beta 2", "2.4.0 release candidate", "2.4.0 final", "2.4.1", "2.4.2", etc. The main issue I have with this is that RPM considers that "2.4.0" comes earlier than "2.4.0.alpha1", so I can't just add the suffix on the end of the final version number. I could try "2.4.0.alpha1", "2.4.0.beta1", "2.4.0.final", which would work, except for the "release candidate" that would be considered later than "2.4.0.final". An alternative I considered is using the "epoch:" section of the RPM version number (the epoch: prefix is considered before the main version number so that "1:2.4.0" is actually earlier than "2:1.0.0"). By putting a timestamp in the epoch: field, all the versions get ordered as expected by RPM, because their versions appear to increment in time. However, this fails when new releases are made on several major versions at the same time (for example, 2.3.2 is released after 2.4.0, but their version for RPM are "20121003:2.3.2" and "20120928:2.4.0" and systems on 2.3.2 can't get "upgraded" to 2.4.0, because rpm sees it as an older version). In this case, yum/zypper/etc refuse to upgrade to 2.4.0, thus my problem. What version numbers can I use to achieve this, and make sure that RPM always considers the version numbers to be in order. Or if not version numbers, other mechanism in RPM packaging? Note 1: I would like to keep the "Release:" field of the spec file for it's original purpose (several releases of packages, including packaging changes, for the same version of the packaged software). Note 2: This should work on current production versions of major distributions, such as RHEL/CentOS 6 and SLES 11. But I'm interested in solutions that don't, too, so long as they don't involve recompiling rpm! Note 3: On Debian-like systems, dpkg uses a special component in the version number which is the "~" (tilde) character. This causes dpkg to count the suffix as "negative" ordering, so that "2.4.0~anything" will come before "2.4.0". Then, normal ordering applies after the "~", so "2.4.0~alpha1" comes before "2.4.0~beta1" because "alpha" comes before "beta" alphabetically. I'm not necessarily looking to use the same scheme for RPM packages (I'm pretty sure no such equivalent exists), so this is just FYI.

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