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• Upgraded to Ubuntu 12.04 from 10.04 and have to transfer database from Postgresql 8.4 to 9.1

  - by Stpn

  I upgraded server with a Rails application to Ubuntu 12.04 from 10.04 and cannot connect to Postgresql database now... Here is the error message from Rails app: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432" Also the pg_ctl start is not recognized as a command.. EDIT: Turns out my database in on Postgresl 8.4 and my sever is now running on 9.1. So all the database files / configs are on 8.4.. How can I transfer them? Just straight copy from old pg_hba.conf?

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• Logical move of a server to UK, what do I do with the SSL certificates

  - by flyfishr64

  I have been asked to move a rails application from the US to the UK. This involves bringing up the rails stack on Ubuntu 8.04.4; that's completed. I'm stumped with the SSL configuration though. The plan was to bring this server up with the same domain name but temporarily use a subdomain (app2.xxx.com instead of app.xxx.com) during the move and for testing, then rename it to app.xxx.com when we're ready for the cutover (does that make sense?). In the meantime, we need a new cert for the app2 subdomain. So to generate a CSR, I need a server key but do I need a new one, or should I copy the one from the existing production server?

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• API Auth vs User Auth

  - by user1626384

  I have read many posts and articles on this topic but still cant connect the dots. I want to make a Rails app that is strictly a JSON API maybe using Sinatra or the rails-api gem. I also want to make both a web client app and an iPhone app which consumes the API. No plans on letting third party dev's use it. So I could create a separate username/password combination for both the web and mobile client and use HTTP Basic over SSL. Each app would have these values as configs in the source and use it to authenticate to the API so only these can make a call. Anyone else trying would get a 401 error returned. This would be considered handling the API authentication. The web and mobile client apps allow end users to sign up and read/write data to the API. When each user is created, I create and save a token in their profile. If a user successfully signs in, I send back the token. On each future read/write then also send along this token in the header. I get the token and lookup the user in the database and make the read/write. Does this sound like an appropriate way to handle it. For the web client, when I initially send back the token, where do I store it. In a cookie? Do I also drop a cookie to handle session state?

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• SyncToBlog #11 Stuff and more stuff

  - by Eric Nelson

  Just getting more stuff “down on paper” which grabbed my attention over the last couple of weeks. http://www.koodibook.com/ is live. This is a a rich desktop application built in WPF by some ex-colleagues and current friends :-) Check it out if “photo books” is your thing or you like sweet WPF UX. Study rates Microsoft .NET Framework rated top, Ruby on Rails 2nd bottom. I know a bit about both of these frameworks. Both are sweet for different reasons. .NET top. Ok – I liked that. But Ruby on Rails 2nd bottom just blows away the credibility of the survey results for me. Stylecop is going Open Source. Sweet. ”…will be taking code submissions from the open source community” VMforce for running Java in the cloud. Hmmmmm… Windows Azure Guidance Code and Docs available on patterns and practices. Download both zip files. – One is just the code and the other is 7 chapters of the guide to migration. UK Architect Insight Conference post event presentations are here including a full day track of cloud stuff. http://uxkit.cloudapp.net/ This appears to be a well-kept secret but the Silverlight Demo Kit is on-line in Windows Azure. You already knew! Ok – just me then :-) 3 day Silverlight Masterclass training in the UK from people I trust and like :-) http://silverlightmasterclass.net/ (£995) SQL Server Driver for PHP 2.0 CTP adds PHP's PDO style data access for SQL Server/SQL Azure A Domain Oriented N-Layered .NET 4.0 App Sample from Microsoft Spain. Not looked at it yet – but had it recommended to me (tx Torkil Pedersen) You might also want to check out delicious stream – a blur of azure, ruby and gaming right now http://delicious.com/ericnel :-)

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• Why isn't there a culture of paying for frameworks?

  - by Marty Pitt

  One of the side effects of the recent trend of "Lean" startups, and the app store era, is that consumers are more acclimatised to paying small prices for small games / products. Eg.: Online SAAS that charges ~$5 / month (the basecamp style of product) Games which are short, fun, and cheap ($0.99 from the app store This market has been defined by "doing one thing well, and charging people for it." DHH of Rails / 37 Signals fame argues that if your website isn't going to make money, don't bother making it. Why doesn't the same rule apply to frameworks? There are lots of software framework projects out there - many which are mature and feature-rich, which offer developers significant value, yet there doesn't seem to be a market or culture of paying for these. It seems that the projects which do charge money are often things like UI component toolsets, and are often marginalized in favour of free alternatives. Why is this? Surely programmers / businesses see the value in contributing back to projects such as Ruby, Rails, Hibernate, Spring, Ant, Groovy, Gradle, (the list goes on). I'm not suggesting that these frameworks should start charging for anyone who wants to use them, but that there must be a meaningful business model that would allow the developers to earn money from the time they invest developing the framework. Any thoughts as to why this model hasn't emerged / succeeded?

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• @CodeStock 2012 Review: Leon Gersing ( @Rubybuddha ) - "You"

  "YOU"Speaker: Leon GersingTwitter: @Rubybuddha Site: http://about.me/leongersing I honestly had no idea what I was getting in to when I sat down in to this session. I basically saw the picture of the speaker and knew that it would be a good session. I was completely wrong; it was the BEST SESSION of CodeStock 2012.  In fact it was so good, I texted another coworker attending the conference to get over and listen to Leon. Leon took on the concept of growth in the software development community. He specifically referred David Hansson in his ability to stick to his beliefs when the development community thought that he was crazy for creating Ruby on Rails. If you do not know this story Ruby on Rails is one of the fastest growing web languages today. In addition, he also touched on the flip side of this argument in that we must be open to others ideas and not discard them so quickly because we all come from differing perspectives and can add value to a project/team/community. This session left me with two very profound concepts/quotes: “In order to learn you must do it badly in front of a crowed and fail.” - @Rubybuddha I can look back on my career so far and say that he is correct; I think I have learned the most after failing, especially when I achieved this failure in front of other. “Experts must be able to fail.” - @Rubybuddha I think we can all learn from our own mistakes but we can also learn from others. When respected experts fail it is a great learning opportunity for the entire team as well as the person who failed. When expert admit mistakes and how they worked through them can be great learning tools for other developers so that they know how to avoid specific scenarios and if they do become stuck in the same issue they will know how to properly work their way out of them.

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• @CodeStock 2012 Review: Leon Gersing ( @Rubybuddha ) - "You"

  "YOU"Speaker: Leon GersingTwitter: @Rubybuddha Site: http://about.me/leongersing I honestly had no idea what I was getting in to when I sat down in to this session. I basically saw the picture of the speaker and knew that it would be a good session. I was completely wrong; it was the BEST SESSION of CodeStock 2012.  In fact it was so good, I texted another coworker attending the conference to get over and listen to Leon. Leon took on the concept of growth in the software development community. He specifically referred David Hansson in his ability to stick to his beliefs when the development community thought that he was crazy for creating Ruby on Rails. If you do not know this story Ruby on Rails is one of the fastest growing web languages today. In addition, he also touched on the flip side of this argument in that we must be open to others ideas and not discard them so quickly because we all come from differing perspectives and can add value to a project/team/community. This session left me with two very profound concepts/quotes: “In order to learn you must do it badly in front of a crowed and fail.” - @Rubybuddha I can look back on my career so far and say that he is correct; I think I have learned the most after failing, especially when I achieved this failure in front of other. “Experts must be able to fail.” - @Rubybuddha I think we can all learn from our own mistakes but we can also learn from others. When respected experts fail it is a great learning opportunity for the entire team as well as the person who failed. When expert admit mistakes and how they worked through them can be great learning tools for other developers so that they know how to avoid specific scenarios and if they do become stuck in the same issue they will know how to properly work their way out of them.

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• Law of Demeter confusion [duplicate]

  - by user2158382

  This question already has an answer here: Rails: Law of Demeter Confusion 4 answers I am reading a book called Rails AntiPatterns and they talk about using delegation to to avoid breaking the Law of Demeter. Here is their prime example: They believe that calling something like this in the controller is bad (and I agree) @street = @invoice.customer.address.street Their proposed solution is to do the following: class Customer has_one :address belongs_to :invoice def street address.street end end class Invoice has_one :customer def customer_street customer.street end end @street = @invoice.customer_street They are stating that since you only use one dot, you are not breaking the Law of Demeter here. I think this is incorrect, because you are still going through customer to go through address to get the invoice's street. I primarily got this idea from a blog post I read: http://www.dan-manges.com/blog/37 In the blog post the prime example is class Wallet attr_accessor :cash end class Customer has_one :wallet # attribute delegation def cash @wallet.cash end end class Paperboy def collect_money(customer, due_amount) if customer.cash < due_ammount raise InsufficientFundsError else customer.cash -= due_amount @collected_amount += due_amount end end end The blog post states that although there is only one dot customer.cash instead of customer.wallet.cash, this code still violates the Law of Demeter. Now in the Paperboy collect_money method, we don't have two dots, we just have one in "customer.cash". Has this delegation solved our problem? Not at all. If we look at the behavior, a paperboy is still reaching directly into a customer's wallet to get cash out. Can somebody help me clear the confusion. I have been searching for the past 2 days trying to let this topic sink in, but it is still confusing.

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• Trying to move away from PHP/Yii: RoR, Python/Django or ASP.NET MVC? Your opinions please [closed]

  - by Örs

  I have a CS degree and I've been working as a web developer (front & backend) for about 2 years now. I've been working with PHP mostly because it was easy to pick up and find a job, but I've grown to dislike the language and want to try something new, and possibly get a better paying job. That last point is especially important because in my area (Romania/Eastern Europe) PHP jobs are mostly for people fresh out of college/high school, hence the pay is rather low. I've been working with the Yii framework which, if I understand correctly, borrows a lot from Ruby on Rails (convention over configuration, MVC, Active Record, scaffolding). Other than PHP I only know curly-brace languages (C/C++/Java) and bash so Python/Ruby might be a bit challenging. On the other hand I've been using Linux (with vim and recently Sublime Text 2) for almost 4 years now so Windows and a lack of a terminal would have its downsides as well. I'm leaning towards Python/Ruby because of my *nix bias (plus both look like fun), but I've heard great things about ASP.NET MVC as well. Any suggestions? PS: I think there are more jobs in ASP.NET around here, but that's not necessarily a plus, because there are a lot of CS graduates as well. tl;dr: Romanian PHP/Yii developer trying to move to Python/Django or Ruby/Rails or C#/ASP.NET MVC. Suggestions?

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• Alternatives to PHP [closed]

  - by kaz

  We are starting a project, which goal is to create new frontend interface to our product. Old version was created in PHP, very poorly written. We are choosing the language and frameworks that we want to use in new version. Requirements: New interface will be communicating with API. Application will not have it's own database. We don't have a big team, 3 max programmers for entire project. The main programmers are PHP veterans and knows some other technologies (Rails, C, C++, some Java) but not in professional level. But overall they are good and experienced programmers. So: We want to find a good alternative to PHP. I like Rails very much, but whole ActiveRecord model will be useless, when using application API. Java needs a lot of configuration and someone who is expert in Java to properly run this project. Also, in Java there are a lot of big and complicated enterprise frameworks - not very good for 2-3 programmers team. Python - I don't know Python and don't know good and experienced programmers who knows PY - but it's not so complicated and big as Java and maybe in long period it's good alternative for PHP. What are your thoughts?

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• Discover What Powers Your Favorite Websites

  - by Matthew Guay

  Have you ever wondered if the site you’re visiting is powered by WordPress or if the webapp you’re using is powered by Ruby on Rails?  With these extensions for Google Chrome, you’ll never have to wonder again. Geeks love digging under the hood to see what makes their favorite apps and sites tick.  But opening the “View Source” window today doesn’t tell you everything there is to know about a website.  Plus, even if you can tell what CMS is powering a website from its source, it can be tedious to dig through lines of code to find what you’re looking for.  Also, the HTML code never tells you what web server a site is running on or what version of PHP it’s using.  With three extensions for Google Chrome you’ll never have to wonder again.  Note that some sites may not give as much information, but still, you’ll find enough data from most sites to be interesting. Discover Web Frameworks and Javascript Libraries with Chrome Sniffer If you want to know what CMS is powering a site or if it’s using Google Analytics or Quantcast, this is the extension for you.  Chrome Sniffer (link below) identifies over 40 different frameworks, and is constantly adding more.  It shows the logo of the main framework on the site on the left of your address bar.  Here wee see Chrome Sniffer noticed that How-To Geek is powered by WordPress.   Click the logo to see other frameworks on the site.  We can see that the site also has Google Analytics and Quantcast.  If you want more information about the framework, click on its logo and the framework’s homepage will open in a new tab. As another example, we can see that the Tumblr Staff blog is powered by Tumblr (of course), the Discus comment system, Quantcast, and the Prototype JavaScript framework. Or here’s a site that’s powered by Drupal, Google Analytics, Mollom spam protection, and jQuery.  Chrome Sniffer definitely uncovers a lot of neat stuff, so if you’re into web frameworks you’re sure to enjoy this extension. Find Out What Web Server The Site is Running On Want to know whether the site you’re looking at is running on IIS or Appache?  The Web Server Notifier extension for Chrome (link below) lets you easily recognize the web server a site is running on by its favicon on the right of the address bar.  Click the icon to see more information. Some web servers will show you a lot of information about their server, including version, operating system, PHP version, OpenSSL version, and more. Others will simply tell you their name. If the site is powered by IIS, you can usually tell the version of Windows Server its running on since the IIS versions are specific to a version of Windows.  Here we see that Microsoft.com is running on the latest and greatest – Windows Server 2008 R2 with IIS 7.5. Discover Web Technologies Powering Sites Wondering if a webapp is powered by Ruby on Rails or ASP.NET?  The Web Technology Notifier extension for Chrome (link below), from the same developer as the Web Server Notifier, will let you easily discover the backend of a site.  You’ll see the technology’s favicon on the right of your address bar, and, as with the other extension, can get more information by clicking the icon. Here we can see that Backpack from 37signals is powered by the Phusion Passenger module to run Ruby on Rails.   Microsoft’s new Docs.com Office Online apps is powered by ASP.NET…   And How-To Geek has PHP running to power WordPress. Conclusion With all these tools at hand, you can find out a lot about your favorite sites.  For example, with all three extensions we can see that How-To Geek runs on WordPress with PHP, uses Google Analytics and Quantcast, and is served by the LightSpeed web server.  Fun info, huh?   Links Download the Chrome Sniffer extension Download the Web Server Notifier extension Download the Web Technology Notifier extension Similar Articles Productive Geek Tips Enjoy a Clean Start Page with New Tab PageEnjoy Image Zooming on Your Favorite Photo Websites in ChromeAdd Your Own Folders to Favorites in Windows 7Find User Scripts for Your Favorite Websites the Easy WayAdd Social Elements to Your Gmail Contacts with Rapportive TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips Xobni Plus for Outlook All My Movies 5.9 CloudBerry Online Backup 1.5 for Windows Home Server Snagit 10 tinysong gives a shortened URL for you to post on Twitter (or anywhere) 10 Superb Firefox Wallpapers OpenDNS Guide Google TV The iPod Revolution Ultimate Boot CD can help when disaster strikes

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• Using glassfish gem (or other webserver) with SSL

  - by Wolfgang

  My goal is to deploy a simple rails application on a windows server using the glassfish gem. I have no trouble getting the glassfish gem to work with regular http, however I now need to add SSL security and I cannot find any links on how to enable https in the glassfish gem. Has anyone succeeded in setting up the glassfish gem to support SSL? Are there any other ways to serve a rails application over SSL on windows without any additional software installation (e.g. IIS, Glassfish, jBoss)?

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• Library to parse ERB files

  - by Douglas Sellers

  I am attempting to parse, not evaluate, rails ERB files in a Hpricot/Nokogiri type manner. The files I am attempting to parse contain HTML fragments intermixed with dynamic content generated using ERB (standard rails view files) I am looking for a library that will not only parse the surrounding content, much the way that Hpricot or Nokogiri will but will also treat the ERB symbols, <%, <%= etc, as though they were html/xml tags. Ideally I would get back a DOM like structure where the <%, <%= etc symbols would be included as their own node types. I know that it is possible to hack something together using regular expressions but I was looking for something a bit more reliable as I am developing a tool that I need to run on a very large view code base where both the html content and the erb content are important. For example, content such as: blah blah blah <divMy Great Text <%= my_dynamic_expression %</div Would return a tree structure like: root - text_node (blah blah blah) - element (div) - text_node (My Great Text ) - erb_node (<%=)

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• rails3, gridfs and mongomapper: how to serve files? send_data?

  - by z3cko

  i am currently developing a rails3 app with mongomapper and file storage in gridfs. after some trying around, i found grip and currently also use it in the app for storing the data. so far, so good - now i am trying to get my head around serving the files to the user -- what would be the best/fastest way to achieve that? from: http://railstips.org/blog/archives/2009/12/23/getting-a-grip-on-gridfs/ there seem to be 2 ways: send_data from ruby/rails - is this a recommended way? fast enough? (i want to use passenger in the deploy setup) writing a rails metal (see http://gist.github.com/264077) - any comments or hints on how to use that with rails3? any other ideas or even examples? thanks a lot!

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• Should I use Google Web Toolkit for my new webapp?

  - by balint.miklos

  I would like to create a database backed interactive AJAX webapp which has a custom (specific kind of events, editing) calendaring system. This would involve quite a lot of JavaScript and AJAX, and I thought about Google Web Toolkit for the interface and Ruby on Rails for server side. Is Google Web Toolkit reliable and good? What hidden risks might be if I choose Google Web Toolkit? Can one easily combine it with Ruby on Rails on server side? Or should I try to use directly a JavaScript library like jQuery? I have no experience in web development except some HTML, but I am an experienced programmer (c++, java, c#), and I would like to use only free tools for this project.

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• No colors when using autospec

  - by kfitzpatrick

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

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• Using glassfish gem with SSL

  - by Wolfgang

  My goal is to deploy a simple rails application on a windows server using the glassfish gem. I have no trouble getting the glassfish gem to work with regular http, however I now need to add SSL security and I cannot find any links on how to enable https in the glassfish gem. Has anyone succeeded in setting up the glassfish gem to support SSL? Are there any other ways to serve a rails application over SSL on windows without any additional software installation (e.g. IIS, Glassfish, jBoss)?

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• Attachment_fu error

  - by cswebgrl

  Hello, I am getting an error while trying to upload images on an Ubuntu machine that's running Rails 2.3.4, Ruby 1.8.6 using attachment_fu with image science. FreeImage exception for type ???: IPTC: Invalid key 'Tag 0x025C' The error seems to point to this line in the image_science_processor in the attachment_fu plugin: def with_image(file, &block) ::ImageScience.with_image file, &block end My initial thoughts are that it has something to do with meta tags and the images and maybe free image. I don't actually see this error on my dev machine - Mac Snow Leopard, Rails 2.3.5, Ruby 1.8.7. Before I start messing versions on the production boxes, has anyone else encountered this issue and have an idea to fix it? THANKS!!!!

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• Exact Target integration with Ruby examples?

  - by Brian

  Anyone used Ruby or Rails to integrate with Exact Target's API or have a good example of using WSSE with SOAP4r?

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• Problem with jQuery.ajax with 'delete' method in ie

  - by Max Williams

  I have a page where the user can edit various content using buttons and selects that trigger ajax calls. In particular, one action causes a url to be called remotely, with some data and a 'put' request, which (as i'm using a restful rails backend) triggers my update action. I also have a delete button which calls the same url but with a 'delete' request. The 'update' ajax call works in all browsers but the 'delete' one doesn't work in IE. I've got a vague memory of encountering something like this before...can anyone shed any light? here's my ajax calls: //update action - works in all browsers jQuery.ajax({ async:true, data:data, dataType:'script', type:'put', url:"/quizzes/"+quizId+"/quiz_questions/"+quizQuestionId, success: function(msg){ initializeQuizQuestions(); setPublishButtonStatus(); } }); //delete action - fails in ie function deleteQuizQuestion(quizQuestionId, quizId){ //send ajax call to back end to change the difficulty of the quiz question //back end will then refresh the relevant parts of the page (progress bars, flashes, quiz status) jQuery.ajax({ async:true, dataType:'script', type:'delete', url:"/quizzes/"+quizId+"/quiz_questions/"+quizQuestionId, success: function(msg){ alert("success"); initializeQuizQuestions(); setSelectStatus(quizQuestionId, true); jQuery("tr[id*='quiz_question_"+quizQuestionId+"']").removeClass('selected'); }, error: function(msg){ alert("error:" + msg); } }); } I put the alerts in success and error in the delete ajax just to see what happens, and the 'error' part of the ajax call is triggered, but WITH NO CALL BEING MADE TO THE BACK END (i know this by watching my back end server logs). So, it fails before it even makes the call. I can't work out why - the 'msg' i get back from the error block is blank. Any ideas anyone? Is this a known problem? I've tested it in ie6 and ie8 and it doesn't work in either. thanks - max EDIT - the solution - thanks to Nick Craver for pointing me in the right direction. Rails (and maybe other frameworks?) has a subterfuge for the unsupported put and delete requests: a post request with the parameter "_method" (note the underscore) set to 'put' or 'delete' will be treated as if the actual request type was that string. So, in my case, i made this change - note the 'data' option': jQuery.ajax({ async:true, data: {"_method":"delete"}, dataType:'script', type:'post', url:"/quizzes/"+quizId+"/quiz_questions/"+quizQuestionId, success: function(msg){ alert("success"); initializeQuizQuestions(); setSelectStatus(quizQuestionId, true); jQuery("tr[id*='quiz_question_"+quizQuestionId+"']").removeClass('selected'); }, error: function(msg){ alert("error:" + msg); } }); } Rails will now treat this as if it were a delete request, preserving the REST system. The reason my PUT example worked was just because in this particular case IE was happy to send a PUT request, but it officially does not support them so it's best to do this for PUT requests as well as DELETE requests.

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• Drag and drop: jQuery UI or Scriptaculous?

  - by jpartogi

  Dear all, I am in the middle of the road whether to use jQuery UI or Scriptaculous for drag and drop. I am using Ruby on Rails, and Scriptaculous support in Ruby on Rails is superb with the existence of scriptaculous_helper.rb. But I have already use jQuery for the ajax and DOM manipulation. I do not mind to use scriptaculous since we can use jQuery.noConflict() in the code. I also kind of get the impression that scriptaculous drag and drop is better than jQuery UI drag and drop based on the online demos. So back to the original question, which one would you recommend as a drag and drop library and which one do you think is better than the other? Scriptaculous or jQuery UI?

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• Ruby 1.8.7 compatibility

  - by Sebastian

  I had a exception when I switch to Ruby 1.8.7 on Snow Leopard ArgumentError: wrong number of arguments (1 for 0) /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/connection_adapters/abstract/quoting.rb:27:in 'to_s' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/connection_adapters/abstract/quoting.rb:27:in 'quote' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/connection_adapters/mysql_adapter.rb:190:in 'quote' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/base.rb:2042:in 'quote_value' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/base.rb:2034:in 'attributes_with_quotes' Application uses Rails 1.2.5: there is no chance to update rails in this app. Somebody have solution?

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• mysql gem for snow leopard

  - by Will

  I had trouble with the gem at first but got it to work when I installed the 64-bit MySQL and reinsatlled the gem with arch flags. So it work in rails. The error I used to get was uninitialized constant MysqlCompat::MysqlRes but that is now gone :) However in Xcode when I run a RubyCocoa project I still get the old error of uninitialized constant MysqlCompat::MysqlRes Does anyone know why this may be? Is it because the gdb is 64-bit? How can it work in Rails but not in RubyCocoa? A little debugging shows that it fails to load mysql_api.bundle /Library/Ruby/Gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle: dlopen(/Library/Ruby/Gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle, 9): no suitable image found. Did find: (LoadError) /Library/Ruby/Gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle: mach-o, but wrong architecture - /Library/Ruby/Gems/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'

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• How can I test caching and cache busting?

  - by Nathan Long

  In PHP, I'm trying to steal a page from the Rails playbook (see 'Using Asset Timestamps' here): By default, Rails appends assets' timestamps to all asset paths. This allows you to set a cache-expiration date for the asset far into the future, but still be able to instantly invalidate it by simply updating the file (and hence updating the timestamp, which then updates the URL as the timestamp is part of that, which in turn busts the cache). It‘s the responsibility of the web server you use to set the far-future expiration date on cache assets that you need to take advantage of this feature. Here‘s an example for Apache: # Asset Expiration ExpiresActive On <FilesMatch "\.(ico|gif|jpe?g|png|js|css)$"> ExpiresDefault "access plus 1 year" </FilesMatch> If you look at a the source for a Rails page, you'll see what they mean: the path to a stylesheet might be "/stylesheets/scaffold.css?1268228124", where the numbers at the end are the timestamp when the file was last updated. So it should work like this: The browser says 'give me this page' The server says 'here, and by the way, this stylesheet called scaffold.css?1268228124 can be cached for a year - it's not gonna change.' On reloads, the browser says 'I'm not asking for that css file, because my local copy is still good.' A month later, you edit and save the file, which changes the timestamp, which means that the file is no longer called scaffold.css?1268228124 because the numbers change. When the browser sees that, it says 'I've never seen that file! Give me a copy, please.' The cache is 'busted.' I think that's brilliant. So I wrote a function that spits out stylesheet and javascript tags with timestamps appended to the file names, and I configured Apache with the statement above. Now: how do I tell if the caching and cache busting are working? I'm checking my pages with two plugins for Firebug: Yslow and Google Page Speed. Both seem to say that my files are caching: "Add expires headers" in Yslow and "leverage browser caching" in Page Speed are both checked. But when I look at the Page Speed Activity, I see a lot of requests and waiting and no 'cache hits'. If I change my stylesheet and reload, I do see the change immediately. But I don't know if that's because the browser never cached in the first place or because the cache is busted. How can I tell?

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• Web-Frameworks for Education Management Systems?

  - by Indebi

  So, I'm working on an idea and I'll go into a brief overview of that but my question is, What are some good web frameworks for this situation? I have some experience in the following languages: C# Python I have considerably more experience in C# than Python, however I am expecting to learn new things. My idea is this, a completely web-based community-oriented Education Management System that focuses on making students and teachers day-to-day lives easier. For students it will provide a centralized place for them to do homework, study for tests, and reinforce concepts learned previously in class. For teachers it will give them a centralized place to handle assignments, attendance, homework, tests, and all other major parts of classroom management. All of that, but in a community-oriented fashion. Everything a teacher does is shared and open to constructive criticism, allowing other teachers to use their assignments/tests and for students or other teachers to comment, rate and criticize their assignments. This encourages an environment of openness that will allow teacher's to focus on teaching and student's to focus on learning. And that community wouldn't be limited to one school or school-district, this system would be completely school-independent. Please note that I have no problem with hearing constructive criticism on this idea, however I would prefer if this post was more focused on my question. I have somewhat explored about the following options: Django ASP.NET Ruby on Rails Silverlight (1) I have Django installed and I played with it for a little bit, I really like how easy setting up databases are and how it handles the database completely for you. I don't really know how to use it very well and I don't quite understand the Model-View-Controller paradigm(?) for it yet but I haven't thought about it much. I also like the fact that it uses Python. (2) I don't really like Visual Studio for developing in ASP.NET, I hate the way the web-designer works and it just feels clunky and old. I like the server-side development part though. I don't like how expensive ASP.NET and overall Visual Studio is, even if I do get it for free for now using DreamSpark (3) I haven't been able to explore much with this, I could not get Rails (or maybe Ruby) properly installed. I first installed it within RadRails and that didn't work so I uninstalled RadRails and then installed the latest version of Ruby off the official Windows Installer and then installed Ruby on Rails through gem and even after all that it still didn't work, so I installed Netbeans and attempted to use it there but it still did not work (4) I like Silverlight in some extents, I've played with this one the most, it's very similar to WPF (which I've used the most) in a lot of ways but I don't like how database connectivity works, at least in comparison to Django. I also dislike how expensive everything with Microsoft is, even if I get it for free for now with DreamSpark. I would like to hear some suggestions from experienced web-developers as to what I should use and why, or at least what some good options are for my scenario Your help would be very appreciated

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