Difference between revisions of "Ruby on Rails"

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This is valid for Rails 2.2.2, the version i'm using currently. May be valid for other versions.
This is valid for Rails 2.2.2 up to 2.3.3, the versions i'm using currently. May be valid for other versions.
= Fast commands =
= Fast commands =

Revision as of 17:00, 29 April 2010

This is valid for Rails 2.2.2 up to 2.3.3, the versions i'm using currently. May be valid for other versions.

Fast commands

  • Help yourself, use BORT for application baseline


ruby script/generate scaffold Project name:string description:text
ruby script/generate migration AddOwnerToProject
rake db:migrate
rake db:schema:dump


rake routes



  1. Install http://hoptoadapp.com/ or http://getexceptional.com/
  2. Look in log/development.log
  3. Add "debugger" somewhere in the controller
  4. Relaunch the server using "ruby script/server --debugger"
    1. now commands can be typed like "list", "up", "irb" (for an Interactive Ruby session) or "cont"
    2. Remember the name of the top level object is "self" so printing something like "p self" can be useful


Usually with:

ruby script/server


rake dbconsole
ruby script/dbconsole


rake console
ruby script/console





gem install <gemname>

if it breaks, try to do:

gem install

if it still breaks, try to do:

require 'rubygems'
gem 'myproblemgem', '1.0.0'

then look at the problem.


for example this session shows that the "echoe" gem is not installed. When running script/server:

/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
Missing these required gems:
  capistrano-ext  = 1.2.1

You're running:
  ruby at /usr/local/bin/ruby
  rubygems 1.2.0 at /usr/local/lib/ruby/gems/1.8

Run `rake gems:install` to install the missing gems.

well... indeed Captistrano-ext IS installed:

$ ls -ald /usr/local/lib/ruby/gems/1.8/gems/cap*
drwxr-xr-x   12 root  wheel  408 Jan 20 12:11 /usr/local/lib/ruby/gems/1.8/gems/capistrano-2.5.3
drwxr-xr-x    9 root  wheel  306 Jan 20 13:00 /usr/local/lib/ruby/gems/1.8/gems/capistrano-ext-1.2.1

but running the code with irb gives more details:

$ irb
>> require 'rubygems'
=> false
>> gem 'capistrano-ext', '1.2.1'
Gem::LoadError: Could not find RubyGem echoe (>= 0)

        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:578:in `report_activate_error'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:134:in `activate'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:158:in `activate'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:157:in `each'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:157:in `activate'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:158:in `activate'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:157:in `each'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:157:in `activate'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:158:in `activate'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:157:in `each'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:157:in `activate'
        from /usr/local/lib/ruby/site_ruby/1.8/rubygems.rb:49:in `gem'
        from (irb):2

So a simple:

# gem install echoe
Successfully installed echoe-3.0.2
1 gem installed
Installing ri documentation for echoe-3.0.2...
Installing RDoc documentation for echoe-3.0.2...

fixed the problem... well... you get the idea: there's a broken dependency in captistrano-ext for echoe....



Error creating thumbnail: Unable to save thumbnail to destination

Template applications


Initialize a new BORT instance

  • Edit
  • Type
Rake db:migrate

Modifying the Homepage

Edit file:


Modifying the Database

ruby script/generate migration AddProjectTable

or directly one of these:

ruby script/generate scaffold Project name:string description:text url:string
ruby script/generate scaffold Uploadbin hashid:string orig_filename:string stored_filename:string description:text url:string has_report:boolean owner_id:integer

Deploy with Capistrano

On the server host run:

ln -s myapp.mydomain.com penguins.dreamhost.com
mkdir -p ~/myapp.mydomain.com/releases

On local host, run

cap deploy:setup
cap deploy:migrations

Deploying on Dreamhost

ssh PROJECT@penguins.dreamhost.com mkdir -p git/PROJECT.git
ssh PROJECT@penguins.dreamhost.com "cd git/PROJECT.git/ && git --bare init"
git remote add origin ssh://PROJECT@penguins.dreamhost.com/~/git/PROJECT.git
git push origin master
ssh PROJECT@penguins.dreamhost.com "mv penguins.dreamhost.com old-penguins.dreamhost.com ; ln -s PROJECT.DOMAIN.com penguins.dreamhost.com"
ssh PROJECT@penguins.dreamhost.com "mkdir -p ~/PROJECT.DOMAIN.com/releases"
ssh PROJECT@penguins.dreamhost.com "touch ~/PROJECT.DOMAIN.com/index.php"
# GO TO dh panel to create MySQL db
cap deploy:setup
cap deploy:migrations
ssh PROJECT@penguins.dreamhost.com gem install term-ansicolor
ssh PROJECT@penguins.dreamhost.com gem install capistrano
ssh PROJECT@penguins.dreamhost.com 'echo "export PATH=\$PATH:~/.gem/ruby/1.8/bin" >> .bashrc; echo "export PATH=\$PATH:~/.gem/ruby/1.8/bin" >> .bash_profile'
ssh PROJECT@penguins.dreamhost.com 'cd `find PROJECT.DOMAIN.com/releases/|head -2|tail -1` && rake gems:install'
ssh PROJECT@penguins.dreamhost.com "ls -ald ./PROJECT.DOMAIN.com/current/public "