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IRB subsessions let you try things without ending or affecting any of your existing subsessions. The commands to work with subsessions are:
irb start a new subsession
jobs list subsessions
fg # switch to a subsession
kill # kill a subsession
>> my_string = "foo" => "foo" >> irb >> my_string NameError: undefined local variable or method `my_string' for main:Object from (irb#1):1 >> jobs => #0->irb on main (#: stop) #1->irb#1 on main (#: running) >> fg 0 => #, @signal_status=:IN_EVAL, @scanner=#> >> my_string => "foo"
It’s very exciting that i can finally install mysql2 on Mac OS X 10.6 successfully!!
solved with
sudo gem install mysql2 -- --srcdir=/usr/local/mysql/include
refer from: https://gist.github.com/972626
it’s really great!!!!! hope this can help you.
If you are trying out the latest release of rails 3.1, you might encounter a problem that quotes:
Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes.
I think this problem will makes the beginner confuse, or it should provides a more explicit message or instruction.
After spending a few minutes searching on the web, I found that you can fix this problem by simply adding gem ‘therubyracer’ into your Gemfile (it’s for Ruby MRI).
gem 'therubyracer
And that’s all folks, enjoy rails 3.1 which integrates jquery, scss, coffeescript, and lots more.. by default 
Well, you could always use Ruby itself, too, that way you’ll always have an up-to-date list:
exceptions = [] tree = {} ObjectSpace.each_object(Class) do |cls| next unless cls.ancestors.include? Exception next if exceptions.include? cls next if cls.superclass == SystemCallError # avoid dumping Errno's exceptions << cls cls.ancestors.delete_if {|e| [Object, Kernel].include? e }.reverse.inject(tree) {|memo,cls| memo[cls] ||= {}} end indent = 0 tree_printer = Proc.new do |t| t.keys.sort { |c1,c2| c1.name c2.name }.each do |k| space = (' ' * indent); space ||= '' puts space + k.to_s indent += 2; tree_printer.call t[k]; indent -= 2 end end tree_printer.call tree
The hierarchy:
Exception
NoMemoryError
ScriptError
LoadError
NotImplementedError
SyntaxError
SignalException
Interrupt
StandardError
ArgumentError
IOError
EOFError
IndexError
LocalJumpError
NameError
NoMethodError
RangeError
FloatDomainError
RegexpError
RuntimeError
SecurityError
SystemCallError
SystemStackError
ThreadError
TypeError
ZeroDivisionError
SystemExit
fatal
Mustache is …
So, for binding mustache in your Rails3 project, add the following gems to you Gemfile
gem 'mustache' gem 'mustache_rails3'
You can enable the mustache template handler by running
rails g mustache:install
Then in RAILS_ROOT/config/initializers/mustache.rb
rails g mustache:install # Be sure to install mustache gem and include mustache gem in project Gemfile. # Template Handler require 'mustache_rails' # Generator Rails.application.config.generators.template_engine :mustache # Need to change dynamically when the theme changed Mustache::Rails::Config.template_base_path = Rails.root.join('themes', 'n5ken', 'templates') Mustache::Rails::Config.shared_path = Rails.root.join('themes', 'n5ken', 'templates', 'shared') # You can change these defaults in, say, a Rails initializer or # environment.rb, e.g.: # # Mustache::Rails::Config.template_base_path = Rails.root.join('app', 'templates') module Config def self.template_base_path @template_base_path ||= ::Rails.root.join('app', 'templates') end def self.template_base_path=(value) @template_base_path = value end def self.template_extension @template_extension ||= 'html.mustache' end def self.template_extension=(value) @template_extension = value end def self.shared_path @shared_path ||= ::Rails.root.join('app', 'templates', 'shared') end def self.shared_path=(value) @shared_path = value end end
If we run scaffold to create a product model, we will get the response messages as follow:
$:/var/projects/template# rails g scaffold Product title:string description:text
invoke active_record
create db/migrate/20110703090715_create_products.rb
create app/models/product.rb
invoke test_unit
create test/unit/product_test.rb
create test/fixtures/products.yml
route resources :products
invoke scaffold_controller
create app/controllers/products_controller.rb
invoke mustache
create app/views/products
create app/views/products/index.rb
create app/templates/products/index.html.mustache
create app/views/products/edit.rb
create app/templates/products/edit.html.mustache
create app/views/products/show.rb
create app/templates/products/show.html.mustache
create app/views/products/new.rb
create app/templates/products/new.html.mustache
create app/templates/products/_form.html.mustache
invoke test_unit
create test/functional/products_controller_test.rb
invoke helper
create app/helpers/products_helper.rb
invoke test_unit
create test/unit/helpers/products_helper_test.rb
invoke stylesheets
create public/stylesheets/scaffold.css
From the message, it will generate mainly three folders: controller, view, templates.
Installing the REE by RVM in Ubuntu may have the following error, this because you missed some dependencies:
root@ubuntu:~# rvm install ree
Installing Ruby Enterprise Edition from source to: /usr/local/rvm/rubies/ree-1.8.7-2011.03
ree-1.8.7-2011.03 - #fetching (ruby-enterprise-1.8.7-2011.03)
curl: /usr/local/staf/lib/libcrypto.so.0.9.8: no version information available (required by /usr/lib/libcurl.so.4)
curl: /usr/local/staf/lib/libssl.so.0.9.8: no version information available (required by /usr/lib/libcurl.so.4)
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 7713k 100 7713k 0 0 57223 0 0:02:18 0:02:18 --:--:-- 50726
ree-1.8.7-2011.03 - #extracting ruby-enterprise-1.8.7-2011.03 to /usr/local/rvm/src/ree-1.8.7-2011.03
ree-1.8.7-2011.03 - #installing
ERROR: Error running './installer -a /usr/local/rvm/rubies/ree-1.8.7-2011.03 --dont-install-useful-gems ', please read /usr/local/rvm/log/ree-1.8.7-2011.03/install.log
ERROR: There has been an error while trying to run the ree installer. Halting the installation.
So, now you just need:
sudo apt-get install build-essential zlib1g-dev libssl-dev libreadline6-dev
RVM is a good tool for managing Ruby and Gems, so the following codes shows you how to use:
Ruby Management
Use a particular Ruby
$ rvm use 1.8.6
Equivalently (because of RVM’s defaults):
$ rvm 1.8.6
List Ruby interpreters available for installation
$ rvm list known # MRI Rubies [ruby-]1.8.6[-p399] [ruby-]1.8.6-head [ruby-]1.8.7[-p330] [ruby-]1.8.7-head ...bla bla bla
List Ruby interpreters you’ve already installed
$ rvm list ruby-1.8.6-p383: ruby 1.8.6 (2009-08-04 patchlevel 383) [i686-darwin10.0.0] ruby-1.9.1-head: ruby 1.9.2dev (2009-10-30 trunk 25559) [x86_64-darwin10.0.0] ...bla bla bla
Ruby information for the current shell
$ rvm info rvm 0.0.49 (2009.09.24) [http://rvm.beginrescueend.com/] ruby: interpreter: "ruby" version: "1.8.6" ...bla bla bla
Install a specific Ruby version, e.g.
$ rvm install jruby
or
$ rvm install 1.9.2
Switch to gems directory for current ruby
$ rvm gemdir /Users/wayne/.gem/ruby/1.9.1
Switch to the system gems directory
$ rvm gemdir system /Library/Ruby/Gems/1.8
Use the user set default ruby
$ rvm default
Use the system ruby (as if no rvm)
$ rvm system
Reset to pre-RVM state.
$ rvm reset
Uninstall RVM installed 1.8.7 version
$ rvm uninstall 1.8.7
Named Gem Sets
Examples of creating and changing gem sets
$ rvm 1.9.2-head $ gem install rails -v 2.3.3 $ rvm gemset create rails222 rails126 Gemset 'rails222' created. Gemset 'rails126' created. $ rvm 1.9.2-head@rails222 $ gem install rails -v 2.2.2 $ rvm 1.9.2-head@rails126 $ gem install rails -v 1.2.6 $ rvm 1.8.7 $ gem install rails -v 1.2.3
If you are deploying to a server or you do not want to wait around for rdoc and ri to install for each gem then you can disable these for gem installs and updates. Place these two lines in your ~/.gemrc or /etc/gemrc:
install: --no-rdoc --no-ri update: --no-rdoc --no-ri
Due to the development environment is becoming much more complex than ever, the gems now may have conflict between some projects, so RVM is what exactly you need!
So RVM is not Ruby Virtual Machine, it’s Ruby Version Manager which is used to separate your various Ruby environment, by Using the RVM, you are able to install, uninstall difference Ruby, e.g. Ruby 1.8.x, 1.9.x, REE, IronRuby, and managing gems..
RVM is cool, right? so now, i think you can’t wait to have a try
Installing RVM is quite easy, firstly, you need to confirm the following dependencies, my OS is Ubuntu 10.10:
cURL (apt-get install curl)
If you are ready, you just need to execute this command to finish the installation:
$ bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)
and add the line below to your bash profile, for example in Ubuntu is “/etc/profile”
[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" # This loads RVM into a shell session.
Back to the command line, run “rvm -v”, and you should see the version information:
$ source /etc/profile $ rvm -v rvm 1.6.20 by Wayne E. Seguin (wayneeseguin@gmail.com) [https://rvm.beginrescueend.com/]
So, by now, you have finished the installation of RVM, congratulation!!!
As we know, STAF is a fantastic test automation framework which supports Java, Python, C++ perfectly except Ruby. but there still a solution for this, in the following post, there is an interface for the original Ruby:
http://sourceforge.net/tracker/index.php?func=detail&aid=643842&group_id=33142&atid=407383
But while I’m trying to compile this library according to this post on Ubuntu, i got:
root@ubuntu:~/Downloads/rubystaf# ruby extconf.rb checking for STAFRegister() in -lSTAF... no creating Makefile
It because of missing the required libraries, so include the path to STAF installation path:
root@ubuntu:~/Downloads/rubystaf# ruby extconf.rb --with-staf-dir=/usr/local/staf/ --with-staf-lib=/usr/local/staf/lib checking for STAFRegister() in -lSTAF... yes creating Makefile
Then we can create the “Makefile” successfully
Next, run “make” to make the library, but some errors occur here
root@ubuntu:~/Downloads/rubystaf# make gcc -I. -I/usr/local/ruby/include/ruby-1.9.1/i686-linux -I/usr/local/ruby/include/ruby-1.9.1/ruby/backward -I/usr/local/ruby/include/ruby-1.9.1 -I. -I/usr/local/staf//include -D_FILE_OFFSET_BITS=64 -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o STAFHandle.o -c STAFHandle.c STAFHandle.c: In function ‘sh_new’: STAFHandle.c:74: error: ‘rb_get_argv’ declared as function returning an array STAFHandle.c:74: error: conflicting types for ‘rb_get_argv’ /usr/local/ruby/include/ruby-1.9.1/ruby/intern.h:571: note: previous declaration of ‘rb_get_argv’ was here STAFHandle.c:90: warning: initialization makes pointer from integer without a cast STAFHandle.c:101: error: subscripted value is neither array nor pointer STAFHandle.c:102: error: subscripted value is neither array nor pointer STAFHandle.c: In function ‘sh_submit’: STAFHandle.c:122: warning: assignment makes pointer from integer without a cast STAFHandle.c:123: warning: assignment makes pointer from integer without a cast STAFHandle.c:124: warning: assignment makes pointer from integer without a cast make: *** [STAFHandle.o] Error 1
As we can see, there is a conflicting types in line 74, 101 and 102, because in ruby 1.9.x “rb_argv” was changed to “rb_get_argv”, so just rename the variant name from “rb_argv” to “rb_get_argv” and make again:
http://www.ruby-forum.com/topic/153426
root@ubuntu:~/Downloads/rubystaf# make gcc -I. -I/usr/local/ruby/include/ruby-1.9.1/i686-linux -I/usr/local/ruby/include/ruby-1.9.1/ruby/backward -I/usr/local/ruby/include/ruby-1.9.1 -I. -I/usr/local/staf//include -D_FILE_OFFSET_BITS=64 -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -o STAFHandle.o -c STAFHandle.c gcc -shared -o STAFHandle.so STAFHandle.o -L. -L/usr/local/ruby/lib -Wl,-R/usr/local/ruby/lib -L/usr/local/staf/lib -Wl,-R/usr/local/staf/lib -L/usr/local/staf//lib -Wl,-R/usr/local/staf//lib -L. -rdynamic -Wl,-export-dynamic -lSTAF -lpthread -lrt -ldl -lcrypt -lm -lc
After this step, we should see “STAFHandle.so” in the build path, now for using this library, just simply copy “STAFException.rb”, “STAFResult.rb” and “STAFHandle.so” under the directory named “staf”
For the testing, we can create a new ruby file and run the code below:
$LOAD_PATH << '.'
require 'STAFCommand.rb'
staf_result = STAF::STAFCommand.new 'local', 'ping', 'ping'
puts "STAF rc: #{staf_result.rc}"
puts "STAF result: #{staf_result.result}"
puts "Error message: #{staf_result.errorMsg}"
If no error come up, that means you have build the STAFHandle for Ruby properly~
NOTE:
If you are using Ruby 1.9.x, you will receive:
ruby: symbol lookup error: /root/Downloads/rubystaf/staf/STAFHandle.so: undefined symbol: STR2CSTR
It because STR2CSTR was deprecated in ruby 1.9.x, so we need to use StringValuePtr instead, so you need to open the ”STAFHandle.c” to replace all STR2CSTR and compile again
refer to: http://isitruby19.com/sqlite3-ruby
