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

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

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  • Customer Passenger Error Pages

    - by Adam
    How do you replace the Passenger Application failed to load error messages. They are lovely, but I'd rather not display them when we move our application to production. It'd be better to just show them on the dev box and maintenance page on the live site. For clarification, this is the call stack page passenger displays when your rails app fails to load. I'd rather not modify the passenger template files directly. Passenger doesn't seem to be respecting: ErrorDocument 500 /500.html

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  • Deploy RoR on Apache 1.3 without admin permissions

    - by blinry
    At work I have a SuSE 7.3 running Apache 1.3.20, which I don't have admin access to. I'd like to deploy Ruby on Rails with no or very little work for the admins. I need the service to keep running all the time, even if the server is rebooted, I need it to run faster than CGI-Speed and I'd like to have a simple domain without ports. What are my options?

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  • Rules Engine vs Expert System

    - by User1
    What is the difference between a rules engine and an expert system? Example1: Let's say that I have a program that determines the expiration date of a new driver's license. It takes inputs like visa expiration date, passport number, birthday, etc. It determines the expiration date of the driver's license from this input. It can even give an error if the input did not have enough valid identifications to allow a new driver's license. Example2: Let's say I am making an online version of the game Monopoly. I want the ability to change the rules of the game (say $400 for passing go or no one can buy properties until they land on the same property twice, etc). I have a module in the code to handle these rules. Are these both rules engines or are they expert systems? They both seem so similar. Is it just a synonym?

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  • Installing Heroku on Lucid Lynx reveals missing dependencies

    - by Sir Emeth
    I am trying to get a Ruby on Rails app hosted free somewhere, and Heroku is looking like my last resource. It is supposed to work on Linux, and the gem installs with no errors, but whenever I run any Heroku command it spits out several errors, all connected, and talking about a failed require. I looked it up in the code, and it says: require 'readline' That is it. I have tried to install every variation of libreadline that I can find and think of, but none of it makes any difference.

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  • SSL certificates that works with nginx

    - by jpartogi
    All, After thinking about it, we are planning to buy an SSL certificate. Because an SSL certificate is quite costly, would you be able to share an SSL certificate that works with nginx? I am planning to run Ruby on Rails application. Apache2 will be my last resort. Thank you for sharing. Really appreciate it.

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  • Amazon EC2 Ami recommendations for free tier?

    - by Console
    Amazon web services recently introduced a free tier, where you basically get free stuff to try out AWS and run tiny sites and projects. Basically it's free as long as you remain below a certain limit of bandwidth, disk storage etc. Since going over the limits can quickly become quite expensive (for a hobbyist) I would like some recommendations or suggestions about which AMI's I can run on the free tier, for the purpose of trying out Ruby on Rails and/or Django.

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  • Cannot connect to WEBrick on home network

    - by Chris Stewart
    I'm an Android developer and often my applications require server-side code. I typically use Ruby on Rails for the web app, and during development will run the server on my local machine (Mac OS X) with WEBrick. In the morning when I get to the office, I'll run ifconfig in the console to see what IP my laptop has been given that day. I'll use that IP in my Android app when making requests to the web app in question. This all works fine, when I'm in my office. When I get home, I attempt to do the same thing, find my laptop's IP via ifconfig, set it in my app's config file, but the destination can never be found. To exclude my app from the set of hurdles, I attempt to visit the web server IP (e.g., http://192.168.1.4:3000) from my phone's browser, and it cannot connect. If I try from my laptop, which is running the web server, it works fine. If I try from another machine, on the same network, it also is unable to connect. Given this, I think I've narrowed it down to some kind of configuration in my home network, but I frankly have no idea what the cause could be. I don't have anything special at home, your basic Verizon FiOS router/modem with everything connected via Wi-Fi (Wi-Fi for both phone and laptop at work as well, fyi). I've tried disabling the firewall on my Verizon router, enabling port forwarding, and just about everything else I could do for port 3000, and nothing has changed. Dear Server Fault geniuses, please help a poor developer out. :) Edit: Some follow up items to add. My Mac's firewall is not active, and all incoming requests are allowed. I've also verified on my phone and laptop, that they're on the same network (192.168.1.4 Mac, 192.168.1.9 Phone). I have no idea why this isn't working. Edit 2: I went into System Preferences, enabled Web Sharing, and tried to view the website from my phone and it didn't connect. So it's not WEBrick or related to Rails. The firewall on my machine is off and the firewall on my router is off. Edit 3: Some progress. I set up port forwarding for port 3000 to my laptop, found the external IP, and used that and it connected fine. So, there's definitely something not quite set up correctly on my internal network.

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  • How to setup Proxy Cache with Nginx and Passenger

    - by tiny
    I use Nginx and Passenger for my rails application. I want to use proxy cache to cache my pages. However, every request go direct to my rails application. I don't know what wrong with my configuration. Below is my configuration: user www-data; worker_processes 1; events { worker_connections 1024; } http { passenger_root /usr/lib/ruby/gems/1.8/gems/passenger-2.2.15; passenger_ruby /usr/bin/ruby1.8; passenger_max_pool_size 6; passenger_max_instances_per_app 1; passenger_pool_idle_time 0; rails_spawn_method conservative; include mime.types; default_type application/octet-stream; server_names_hash_bucket_size 512; sendfile on; #tcp_nopush on; keepalive_timeout 65; tcp_nodelay on; gzip on; gzip_http_version 1.0; gzip_vary on; gzip_comp_level 6; gzip_proxied any; gzip_types text/plain text/css text/javascript application/javascript application/json application/x-javascript text/xml application/xml application/xml+rss; proxy_cache_path /var/www/cache/webapp levels=1:2 keys_zone=webapp:8m max_size=1000m inactive=600m; include vhosts/*.conf; include /opt/nginx/conf/sites-enabled/*; root /var/www; } server { listen 127.0.0.1:3008; server_name localhost; root /var/www/yoolk_web_app/public; # <--- be sure to point to 'public'! passenger_enabled on; rails_env development; passenger_use_global_queue on; } server { listen 80; server_name webpage.dev; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $host; error_page 503 http://$host/maintenance.html; location ~* (css|js|png|jpe?g|gif|ico)$ { root /var/www/web_app/public; expires max; } location / { proxy_pass http://127.0.0.1:3008/; proxy_cache webapp; proxy_cache_valid 200 10m; } #More Location }

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  • How to get sites identical in content but different in language and TLD indexed by major search engi

    - by mojo77
    Hi! Is it possible to get two "editions" of a website both indexed by the major search engines (Google/Yahoo/Bing/Teoma) which differ in content language only and are hosted under different TLDs? Say English content is available at "http://domain.com/", German content at "http://domain.de/". Now, if e.g. Google.com is used I want it to list the "domain.com" entry and vice versa. Is "Duplicate Content" an issue here? Thanks so much for advising me!

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  • How do I launch unicorn_rails as a startup script with rvm installed on my ubuntu 12.04 machine?

    - by ne0lithic_coder
    I have a rails app on my server. I have a script startup.sh which launches unicorn_rails and then nginx. In order to get my server to launch on system boot, I've added a line to call my startup script to /etc/rc.local However, this doesn't work. I added some checks to make sure the script is being called and it is. It's the call to unicorn_rails which I think is failing. Does anyone have experience with this?

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  • Is C++ indispensible for AAA game engines, as long as we have console-platform games? [closed]

    - by user1174924
    C++ has remained the industry standard for game engines much because of its features.. The primary reasons are(afaik): Technical reasons - High performance, native runtime, portibility, negligible latency, and more recently concurrency. Socio-Technical reasons - Availability of Libraries, Legecy stuff, most scripting languages on games have a good C api (ex lua), Good IDEs and most recently improved Development time.(C++11) Social reasons - People know C++, Licenced technologies, and battle proven. Does this make C++ for game engines indispensible, so long we have game consoles? Would not, the above features make me implement new graphics technology in C++ only? Edit: Will learning C++ garuntee me a job as a game engine dev In the future? I want to master every aspect of the language, but I already know C# and python. Should I allocate my time learning C++. I want to be a game engine developer.

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  • Will C++ remain viable for game engines in somewhat distant future?

    - by samual
    C++11 has opened ways, which were only dreamt by the C++ programmers. It has been three years since I have been learning C++, and I am going well. Now I want to get into vedio games. Every core of the game code I saw, was monstourously writtern in C++. My question is - If I get into serious game engine dev, and perfecting it would take, maybe say 10 years, would we still be writing game engines in C++ ?(newer standard) Or, will John Carmack, write id tech 7 in c++? note - I am strictly talking about game engines.

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  • How to prevent a search engines from indexing a section of a page?

    - by BrunoLM
    I have many pages with lots of text in it. But I will always have two sections of text and I want to prevent one section from appearing in search results, the other section must be indexed. <p class="please-index-me">text</p> <p class="get-out">never index me please</p> I thought that maybe if I load the "please don't index me text" with Javascript maybe search engines wouldn't look for it. But I am not sure it would work and this is not really nice. I was wondering if there is a way to tell search engines "hey, this text you can't grab, move on". So, is there a way to do it?

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  • Redirect folder to different server

    - by yuval
    Just for clarity, I already posted this on StackOverflow and got advice that this better fits in ServerFault.com so here goes: I know you can redirect subdomains to a different server, but can you do the same with folders? Say I have example.com. I can redirect mysubdomain.example.com to a different server, but can I redirect example.com/mysubdomain to a different server? I'd like to host a rails app in that folder on a site that runs php while still maintaining good search engines ratings (by not creating a sub domain which in my experience in recognized as a different site). Any help? Thanks!

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  • Is there a rails3-compatible emacs mode yet ?

    - by julien
    Rinari hasn't been updated in the last few months, and there doesn't seem to be such progress made in the branches on github. I've never tried emacs-rails, but from what I can see, the same applies. So, is there a rails mode somewhere that's compatible with v3 ?

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  • Ruby on rails generates tests for you. Do those give a false sense of a safety net?

    - by Hamish Grubijan
    Disclaimer: I have not used RoR, and I have not generated tests. But, I will still dare to post this question. Quality Assurance is theoretically impossible to get 100% right in general (Undecidable problem ;), and it is hard in practice. So many developers do not understand that writing good automated tests is an art, and it is hard. When I hear that RoR generates the tests for you, I get very skeptical. It cannot be that easy. Testing is a general concept; it applies across languages. So does the concept of code contracts, it is similar for languages that support it. Code contracts do not generate themselves. The programmer must add the requirements and the promises manually, after doing some thinking about the algorithm / function. If a human gets it wrong, then the tools will propagate the error. Similarly with testing - it takes human judgement about what should happen. Tests do not write themselves, and we are far from the day when a business analyst can just have a conversation with a computer and tell it informally what the requirements are and have the computer do all the work. There is no magic ... how can RoR generate good tests for you? Please shed some light on this. Opinions are ok, for this is a community wiki. Thanks!

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  • undefined method `call' for LiquidView:Class

    - by user181186
    I trying to use Liquid template engine plugin , but I 'm getting the following error while controller tries to render a .liquid template . "undefined method `call' for LiquidView:Class" I installed it as a plugin according to http://wiki.github.com/tobi/liquid/getting-liquid-to-work-in-rails I using Rails 2.3.5 and Ruby 1.8.7. Does anyone had the same problem before ?

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  • Authlogic OpenID error: uninitialized constant OpenIdAuthentication::InvalidOpenId

    - by Bayard Randel
    Using authlogic 2.1.3, and authlogic-oid 1.0.4 I receive the following error as soon as rails hits a controller making a request to an OpenID provider: uninitialized constant OpenIdAuthentication::InvalidOpenId I also have the following installed: rack-openid (0.2.1) ruby-openid (2.1.7) rails/open_id_authentication plugin Gems in environment.rb are configured as such: config.gem "authlogic" config.gem "authlogic-oid", :lib => "authlogic_openid" config.gem "ruby-openid", :lib => "openid" Any suggestions would be appreciated, thank you.

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  • Ruby Enterprise Edition crashes in gc_sweep

    - by Greg
    My Rails application crashes intermittently with the following message: /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/multibyte/utils.rb:52: [BUG] gc_sweep(): unknown data type 0x0(0xbdc2ca0) ruby 1.8.7 (2009-12-24 patchlevel 248) [i686-linux], MBARI 0x8770, Ruby Enterprise Edition 2010.01 I am running the app on Nginx / Passenger. Ruby 1.8.7 Enterprise Edition 2010.10, Rails 2.3.5, Ubuntu 9.10 32bit. Does anybody have an idea how to fix this?

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  • rake: command not found

    - by Errol Siegel
    I'm trying to install rails on Ubuntu 9.10. gem list --local *** LOCAL GEMS *** actionmailer (2.3.4, 2.3.2) actionpack (2.3.4, 2.3.2) activerecord (2.3.4, 2.3.2) activeresource (2.3.4, 2.3.2) activesupport (2.3.4, 2.3.2) rack (1.0.1) rails (2.3.4, 2.3.2) rake (0.8.7) sqlite3-ruby (1.2.5) rake The program 'rake' is currently not installed. You can install it by typing: sudo apt-get install rake rake: command not found How do I solve this?

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  • Require a specific version of ActiveRecord

    - by magnushjelm
    I have both Rails 2.3.4 and Rails 3.0.0.beta installed on my local machine. I am using ActiveRecord in a stand alone ruby script and when I do require 'active_record' 3.0.0.beta is loaded. How can I force it to require 2.3.4 instead? (without uninstalling 3.0.0.beta)

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