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  • Advantages of Java over Ruby/JRuby

    - by Webbisshh
    I am learning Java. I have learned and used Ruby. The Ruby books always tell the advantages of Ruby over Java. But there must be some advantages, that's why lots of people (especially companies) use Java and not Ruby. Please tell the absolute(not philosophical!) advantages of Java over Ruby.

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  • no such file to load -- ruby-mbox (LoadError)

    - by Phil M
    sudo gem install ruby-mbox then I run this require "rubygems" require "ruby-mbox" mbox = Mbox.new("Inbox") and I get this $ ruby mbox_read.rb /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- ruby-mbox (LoadError) from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' from mbox_read.rb:2 gem server says this ruby-mbox 0.0.2 [rdoc] [www] A simple library to read mbox files. Executables are mbox-daemon, mbox-do. Thanks in advance

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  • Ruby 1.8.7 and RSPEC tutorial

    - by Ben Nelson
    I'm just diving into ruby development for a class assignment and the machines at my Uni have only got ruby 1.8.7 on them so I need to develop for that. I have found tutorials on the web for ruby = 1.9 and rspec that are really good but I haven't found anything for ruby 1.8.7 (I'm guessing it's pretty dated?). Does anyone have anything using rspec testing and has an indepth discussion on ruby 1.8.7 for me? I'd really appreciate it! Thanks!

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  • 500 error with deploying rails application via apache2+passenger

    - by user1633983
    I finally completed my own app, so the only work left is deploying the app. I'm using Ubuntu 10.04 and apache2(installed by apt-get), so I'm trying to deploy through passenger. I installed passenger gem like this: sudo gem install passenger rvmsudo passenger-install-apache2-module and I configured apache settings as what the installation message says. I added below lines in the middle of /etc/apache2/apache2.conf file. LoadModule passenger_module /home/admin/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.17/ext/apache2/mod_passenger.so PassengerRoot /home/admin/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.17 PassengerRuby /home/admin/.rvm/wrappers/ruby-1.9.3-p194/ruby and, I appended below lines in /etc/apache2/sites-available/default file. <VirtualHost *:80> ServerName localhost # !!! Be sure to point DocumentRoot to 'public'! DocumentRoot /home/admin/homepage/public <Directory /home/admin/homepage/public> # This relaxes Apache security settings. AllowOverride all # MultiViews must be turned off. Options -MultiViews </Directory> But when I restart the apache service and hit the address, 500 error occurs. At first, it was same 500 error but the 500 error page is from apache's, but when I reinstalled the libapache2-module-passenger, the 500 error page is changed to that from rails'. Because of rails' 500 error page(which is located at public/500.html), I think passenger module is properly connected with apache. What should I do to fix this problem? Do I need to configure something inside my app before deployment?

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  • How can I run Ruby specs and/or tests in MacVim without locking up MacVim?

    - by Henry
    About 6 months ago I switched from TextMate to MacVim for all of my development work, which primarily consists of coding in Ruby, Ruby on Rails and JavaScript. With TextMate, whenever I needed to run a spec or a test, I could just command+R on the test or spec file and another window would open and the results would be displayed with the 'pretty' format applied. If the spec or test was a lengthy one, I could just continue working with the codebase since the test/spec was running in a separate process/window. After the test ran, I could click through the results directly to the corresponding line in the spec file. Tim Pope's excellent rails.vim plugin comes very close to emulating this behavior within the MacVim environment. Running :Rake when the current buffer is a test or spec runs the file then splits the buffer to display the results. You can navigate through the results and key through to the corresponding spot in the file. The problem with the rails.vim approach is that it locks up the MacVim window while the test runs. This can be an issue with big apps that might have a lot of setup/teardown built into the tests. Also, the visual red/green html results that TextMate displays (via --format pretty, I'm assuming) is a bit easier to scan than the split window. This guy came close about 18 mos ago: http://cassiomarques.wordpress.com/2009/01/09/running-rspec-files-from-vim-showing-the-results-in-firefox/ The script he has worked with a bit of hacking, but the tests still ran within MacVim and locked up the current window. Any ideas on how to fully replicate the TextMate behavior described above in MacVim? Thanks!

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  • Foreign keys with Rails' ActiveRecord::Migration?

    - by Earlz
    Hello, I'm new to Ruby on Rails (I know Ruby just decently though) and looking at the Migration tools, it sounds really awesome. Database schemas can finally (easily) go in source control. Now my problem with it. When using Postgres as the database, it does not setup foreign keys. I would like the benefits of foreign keys in my schema such as referential integrity. So how do I apply foreign keys with Migrations?

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  • therubyracer on Ubuntu install issues with ruby-2.0.0-p247

    - by Victor S
    I can't seem to get therubyracer gem installed on ubuntu, i get the following errors, anyone can help? ERROR: Error installing therubyracer: ERROR: Failed to build gem native extension. /home/victorstan/.rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb checking for main() in -lpthread... yes creating Makefile make compiling constraints.cc compiling array.cc compiling value.cc compiling invocation.cc compiling primitive.cc compiling trycatch.cc compiling context.cc compiling exception.cc compiling template.cc compiling accessor.cc compiling object.cc compiling script.cc compiling external.cc compiling stack.cc compiling gc.cc compiling backref.cc compiling heap.cc compiling v8.cc compiling constants.cc compiling date.cc compiling function.cc compiling rr.cc compiling message.cc compiling init.cc compiling string.cc compiling handles.cc compiling signature.cc compiling locker.cc linking shared-object v8/init.so g++: /home/victorstan/.rvm/gems/ruby-2.0.0-p247@global/gems/libv8-3.11.8.17-x86_64-linux/vendor/v8/out/ia32.release/obj.target/tools/gyp/libv8_base.a: No such file or directory g++: /home/victorstan/.rvm/gems/ruby-2.0.0-p247@global/gems/libv8-3.11.8.17-x86_64-linux/vendor/v8/out/ia32.release/obj.target/tools/gyp/libv8_snapshot.a: No such file or directory make: *** [init.so] Error 1 Update It seems it's trying to use a 32 bit library instead of a 64 bit library, anyone else experience issue trying to install 64 bit applications and packages on Ubuntu, and it trying to install 32 bit version instead (even though the system is a 64 Linux)? Related: https://github.com/cowboyd/therubyracer/issues/262

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  • Cannot install Curb gem on Netbeans 6.9 R2

    - by Zeck
    Hi guys, I'm trying to install feedzirra. When i install curb on my netbeans i get following errors. Building native extensions. This could take a while... ERROR: Error installing curb-0.7.6.gem: ERROR: Failed to build gem native extension. "C:/Program Files/NetBeans 6.9 RC2/ruby/jruby-1.5.0/bin/jruby.bat.exe" extconf.rb '"C:/Program Files/NetBeans 6.9 RC2/ruby/jruby-1.5.0/bin/jruby.bat.exe"' is not recognized as an internal or external command, operable program or batch file. Gem files will remain installed in C:/Program Files/NetBeans 6.9 RC2/ruby/jruby-1.5.0/lib/ruby/gems/1.8/gems/curb-0.7.6 for inspection. Results logged to C:/Program Files/NetBeans 6.9 RC2/ruby/jruby-1.5.0/lib/ruby/gems/1.8/gems/curb-0.7.6/ext/gem_make.out Any ideas how I can get this to work? Or did you know very fast feed parser gem?

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  • How to install ferret gem on Windows 7 ?

    - by Rav
    Hi, I was trying to run an OpenSource project which requires ferret to be installed. While installing it using gem install ferret, it's giving this error - Building native extensions. This could take a while... ERROR: Error installing ferret: ERROR: Failed to build gem native extension. C:/Ruby/bin/ruby.exe extconf.rb creating Makefile nmake 'nmake' is not recognized as an internal or external command, operable program or batch file. Gem files will remain installed in C:/Ruby/lib/ruby/gems/1.8/gems/ferret-0.11.6 for inspection. Results logged to C:/Ruby/lib/ruby/gems/1.8/gems/ferret-0.11.6/ext/gem_make.out So, I tried installing nmake (nmake15.exe), but the one I could find. It does not installs on Windows 7.Please help. How can I install ferret ? Thanks so much.

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  • rails g migration error

    - by user1506183
    I don't know what to do. Try to use command $ rails g migration vacancy but this command give me error: invoke active_record /home/proger/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych.rb:203:in `parse': (<unknown>): mapping values are not allowed in this context at line 21 column 11 (Psych::SyntaxError) from /home/proger/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych.rb:203:in `parse_stream' from /home/proger/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych.rb:151:in `parse' ... There are many rows in error code I don't know how to fix that Thanks

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  • rspec & rails 3 cannot find model object

    - by Ceilingfish
    I'm trying to put some specs around a new rails 3 project I am working on, and my first test doesn't seem to be able to find a model. I've installed rspec from the command line using: sudo gem install rspec --pre and then I put the following in my Gemfile gem "rspec-rails", ">= 2.0.0.beta.1" But when I run my test I get ./spec/models/world_spec.rb:1: uninitialized constant World (NameError) rake aborted! Command /opt/local/bin/ruby -Ilib -Ispec "./spec/models/world_spec.rb" failed /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.0.0.beta.4/lib/rspec/core/rake_task.rb:71:in `define' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1112:in `verbose' /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.0.0.beta.4/lib/rspec/core/rake_task.rb:57:in `send' /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.0.0.beta.4/lib/rspec/core/rake_task.rb:57:in `define' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' /opt/local/lib/ruby/1.8/monitor.rb:242:in `synchronize' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31 /opt/local/bin/rake:19:in `load' /opt/local/bin/rake:19 My spec is in spec/models/world_spec.rb, and looks like describe World, "#hello" do it "should be invalid" do World.new.should be_invalid? end end I tried adding a line like require "app/model/world" and require "world" but to no success. Does anyone know what I'm doing wrong?

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  • How do I convert Windows 7 file-name encoding to UTF-8 for Ruby on Rails?

    - by Reilly
    Hi (Ive looked at the other questions - none seemed to quite fit my problem.) I have some file-names under Windows 7 that need to be translated in to MySQL database (UTF-8) with Ruby on Rails. An example file-name includes "íéó" in some kind of Windows 7 file-system encoding. Ive tried many combinations of gsub and ActiveSupport::Multibyte::Chars. Thanks for the help

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  • Ruby / rubyzip alternative capable of handling rar/tar/zip/7z?

    - by Nick Gorbikoff
    I was wondering if anyone knows of rubyzip alternatives for Ruby, that can handle various formats in particular zip / rar / 7z? I know of libarchive, but it's not complete for my purposes ( it's a good gem thou). (To clarify, libarchive - won't work for me - cause I need to be able to run in on Windows. ( Yeah I know sucks to be me)) Right now I end up running system commands to the os, but I'd like something OS independent, and capable of handling those formats - reading and writing. Thank you

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  • Is it possible to bind arrays of literals in sqlite3-ruby?

    - by willb
    I'd like to execute the following sort of query through sqlite3-ruby: SELECT * FROM foo WHERE bar IN (:items) and bind :items to one or many literals. Is this possible? The obvious technique of passing the list of literals as an array as follows doesn't seem to work: db.execute("SELECT * FROM foo WHERE bar IN (:items)", :items=>[3,1]) (In the above example, only the first value in the array is bound to :items.)

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  • May we have Ruby and Rails performance statistics? We're persuading the business to use Rails!

    - by thekingoftruth
    We're convincing our Products officer that we want to use JRuby on Rails, and we're having a hard time coming up with some statistics which show that: Coding time is less using Rails vs. say Struts or Zend Framework or what have you. Ruby (and JRuby in particular) performance isn't horrible (anymore). Rails performance isn't bad either. If you can get us some good stats quickly, we might have a chance!

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  • Using the MongoDB Ruby driver in Rails? (without an object mapper)

    - by Mark L
    I have recently been getting my feet wet in MongoDB using Mongoid w/ Rails 3, but I'm now interested in learning the low level MongoDB features using only the Ruby driver, and trying some map/reduce that would not be possible through Mongoid (afaik) I'm not entirely sure where in Rails I should be setting up the db connections etc, and any pointers would be much appreciated!

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  • What is the meaning of method class in the class definition in Ruby?

    - by Steven Xu
    I'm familiar with function definitions and variable declarations being in class definitions: public class MyClass { public int myvar; public void doSomething() { } } But what does it "mean" in Ruby when a method is actually called in the class definition? This happens amply in Rails, for instance: class User < ActiveRecord::Base has_many :posts end What exactly does this do (at a lower level than "it adds some methods to the class")? How would I implement such a function (e.g., one that mixes in some additional methods)?

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  • Switching from PHP to Ruby - is it the answer to performance?

    - by Industrial
    Hi everyone, I get more often the answer, when asking performance related stuff regarding PHP applications, that PHP really isn't the language for high-performance applications, and that a compiled language really is the way to go. The only thing holding me back to PHP is that it's what I have learned to work with for some while now and the development is quite rapid. So, is PHP a thing of the past and should be put aside in web applications in favour of Ruby, for instance? Thanks

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  • In Ruby, how to write a method to display any object's instance variable names and its values

    - by Jian Lin
    Given any object in Ruby (on Rails), how can I write a method so that it will display that object's instance variable names and its values, like this: @x: 1 @y: 2 @link_to_point: #<Point:0x10031b298 @y=20, @x=38> I also want to be able to print <br> to the end of each instance variable's value so as to print them out nicely on a webpage. the difficulty now seems to be that not every instance variable has an accessor, so it can't be called with obj.send(var_name) (the var_name has the "@" removed, so "@x" becomes "x")

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  • How to read a file from bottom to top in Ruby?

    - by two2twelve
    I've been working on a log viewer for a Rails app and have found that I need to read around 200 lines of a log file from bottom to top instead of the default top to bottom. Log files can get quite large, so I've already tried and ruled out the IO.readlines("log_file.log")[-200..-1] method. Are there any other ways to go about reading a file backwards in Ruby without the need for a plugin or gem?

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