Rails3RC Note

Rails3RC Notes

1. ruby script/COMMAND....

 

rails <command >

 

Usage: rails COMMAND [ARGS]

The most common rails commands are:
 generate       Generate new code (short-cut alias: "g")
 console          Start the Rails console (short-cut alias: "c")
 server            Start the Rails server (short-cut alias: "s")
 dbconsole     Start a console for the database specified in config/database.yml
             (short-cut alias: "db")
 new               Create a new Rails application. "rails new my_app" creates a
             new application called MyApp in "./my_app"

In addition to those, there are:
 application      Generate the Rails application code
 destroy            Undo code generated with "generate"
 benchmarker  See how fast a piece of code runs
 profiler            Get profile information from a piece of code
 plugin              Install a plugin
 runner             Run a piece of code in the application environment

All commands can be run with -h for more information.

 

2. it shouldn't autoload #{RAILS_PATH}/lib

in config/application

# Custom directories with classes and modules you want to be autoloadable.
# config.autoload_paths += %W(#{config.root}/extras)
config.autoload_paths += %W(#{config.root}/lib)

3. error_messages is a plugin...

DEPRECATION WARNING: error_messages_for was removed from Rails and is now available as a plugin. Please install it with `rails plugin install git://github.com/rails/dynamic_form.git`.


4. Validates

class Film < ActiveRecord::Base
  validates :title, :presence => true, :uniqueness => true, :length => { :maximum => 100 }
  validates :budget, :presence => true, :length => { :within => 1..10000000 }
end

http://thelucid.com/2010/01/08/sexy-validation-in-edge-rails-rails-3/


5. Plugin

Use toplevel init.rb; rails/init.rb is deprecated:


6. Model before_#{create, save, update}

If you want to override the method, you should use self.before_#{create, save, update} instead of before_#{create, save, update}.

7. Validate (DEPRECATION WARNING)

Errors#on have been deprecated, use Errors#[] instead.


8. request#request_uri


DEPRECATION WARNING: Using #request_uri is deprecated. Use fullpath instead.