Question

I’m learning ruby on rails by following the tutorials in http://ruby.railstutorial.org/ .

I’m getting invalid option error when I try to create a new project as below,

user1@ubuntu:~/rails_projects$ rails new sample_app -T
**invalid option: -T**

I don’t find -T option in rails man page as well.

user1@ubuntu:~/rails_projects$ rails --help new
Usage: /usr/share/rails-ruby1.8/railties/bin/rails /path/to/your/app [options]

Options:
    -r, --ruby=path                  Path to the Ruby binary of your choice (otherwise scripts use env, dispatchers current path).
                                     Default: /usr/bin/ruby1.8
    -d, --database=name              Preconfigure for selected database (options: mysql/oracle/postgresql/sqlite2/sqlite3/frontbase/ibm_db).
                                     Default: sqlite3
    -D, --with-dispatchers           Add CGI/FastCGI/mod_ruby dispatches code to generated application skeleton
                                     Default: false
        --freeze                     Freeze Rails in vendor/rails from the gems generating the skeleton
                                     Default: false
    -m, --template=path              Use an application template that lives at path (can be a filesystem path or URL).
                                     Default: (none)

Rails Info:
    -v, --version                    Show the Rails version number and quit.
    -h, --help                       Show this help message and quit.

General Options:
    -p, --pretend                    Run but do not make any changes.
    -f, --force                      Overwrite files that already exist.
    -s, --skip                       Skip files that already exist.
    -q, --quiet                      Suppress normal output.
    -t, --backtrace                  Debugging: show backtrace on errors.
    -c, --svn                        Modify files with subversion. (Note: svn must be in path)
    -g, --git                        Modify files with git. (Note: git must be in path)

Description:
    The 'rails' command creates a new Rails application with a default
    directory structure and configuration at the path you specify.

Example:
    rails ~/Code/Ruby/weblog

    This generates a skeletal Rails installation in ~/Code/Ruby/weblog.
    See the README in the newly created application to get going.
user1@ubuntu:~/rails_projects$ rvm notes

any thoughts why it’s not available.

Thanks for your help.

Here is ruby & rails installation details,

user1@ubuntu:~/rails_projects$ rails -v
Rails 2.3.5
user1@ubuntu:~/rails_projects$ ruby -v
ruby 1.8.7 (2010-08-16 patchlevel 302) [i686-linux]
user1@ubuntu:~/rails_projects$ 

Answer 1

Apparently you are using an old version of rails (possibly 2.x) but using the Rails 3.x syntax for creating an app. Note the example in your question:

Example:
    rails ~/Code/Ruby/weblog

So, omit the “new” and type rails sample_app. This is the command for creating apps in older versions (< 3.x) of rails.

In the Rails 3.x, the way to create a new app is by using “new” : rails new sample_app

You should ideally be using the latest stable rails (v 3.0.x) in which case you will also have the -T option available.

To setup your system correctly using rvm:

rvm install 1.8.7       #install Ruby 1.8.7
rvm use 1.8.7 --default #always use 1.8.7 by default when you open a terminal
ruby -v                 #should show ruby 1.8.7 .....
gem install rails       #install the latest stable version of Rails
rails -v                #should show Rails 3.something.something
rails --help            #should show you the -T option now

Note: Don’t type the # and the stuff after it.. it’s just there to show you what the command will do.