This file lists several common commands that you may find useful in
the Ruby on Rails projects for CS142. In most cases you should run these
commands in the top-level directory for a Rails application (exceptions:
"rails new", which creates a new application, and
gem).
rails new foo
Creates a new Rails applications in subdirectory foo.
rails server
Starts up a Web server on port 3000 running the current application; log messages from the server will appear on standard output.
rails console
Starts up a Rails application in interactive mode (you can type commands on the console); doesn't actually start a Web server. This command is convenient if you want to type commands interactively to test their behavior.
rails generate controller foo a b
Creates a new controller class FooController with a
skeleton class
definition in app/controllers/foo_controller.rb. It also
creates skeleton action methods a and b
in the controller, plus skeleton views in the files
app/views/foo/a.html.erb and app/views/foo/a.html.erb.
If a and b are omitted then the controller is
created with no actions or views.
rails generate model foo
Creates a new model class Foo with a skeleton class
definition in app/models/foo.rb and a skeletal migration
in db/migrate/*_create_foos.rb.
rails generate migration foo
Creates a new migration in the file db/migrate/*_foo.rb.
rails destroy model foo
Deletes all of the files created by the rails generate model foo
command above. The command has similar forms to match all of the other
rails generate commands. This command is useful if
you mistype a rails generate command.
rake db:migrate
Runs all migrations to bring the database up to date.
rake db:reset
Drops the database and creates a new one (does not run any migrations on the new database).
rake db:migrate:reset
Drops the database, creates a new one, and runs all migrations to bring the database up to date.
rake db:migrate VERSION=20090909201633_create_photos.rb
Runs migrations (either forward or backward) to restore the database to match the state just after the given migration.
bundle update
If you modify the Gemfile in a project in order to include new or different Ruby Gems, this command will update all of your Gems to match the Gemfile.
gem update
Updates all Ruby Gems to their latest versions.
gem update rails--include-dependencies
Updates Rails to the latest version, including all Gems that Rails depends upon.
gem update --system
Updates Ruby to the latest version. This command does not always appear to work on Macintoshes.