[Locomotive-users] Stuck on first Locomotive attempt--help?

Wed Jun 7 20:13:14 GMT 2006

I'm trying to learn Ruby and Rails simultaneously. The only
Locomotive documentation I've found is the seriously out of
date movie, and I've been trying to adapt it.

I'm OK up to the point where I run
    ruby script/generate scaffold Student
this gives the error
   Before updating scaffolding from new DB schema, try creating a
   table for your model (Student)
and the browser page says
   ActiveRecord::StatementInvalid in StudentsController#list

In the full trace, I find the line
   #{RAILS_ROOT}/app/controllers/students_controller.rb:12:in `list'
and lines 11-13 in students_controller.rb are:
   def list
     @student_pages, @students = paginate :students, :per_page => 10
   end

If I understood the Ruby a bit better, this would probably tell me
exactly what I need to do. As it is, I'm appealing for help.
Advice is welcome, preferably dumbed-down so a Ruby novice like
myself can understand it.

What follows is a step-by-step listing of exactly what I think
I've done so far, in case that's needed.

Advance thanks!!!

   --Dave Matuszek

-----------------------------------------------------------------

    1. Downloaded Locomotive from [[http://locomotive.raaum.org].

    2. Ran by double-clicking the Locomotive icon.

    3. Applications -> Create New...
       Application name: myapp
       Application directory: ~/Desktop
       Framework: Rails 1.1.2.

    4. With 'myapp 3000' selected, clicked green 'Run' button.

    5. In browser, went to http://localhost:3000
       This displayed a welcome page.

    6. Applications -> Open Terminal (don't open any other way!)
       Entered the command: ruby script/generate controller say
       This displayed several 'exists' and 'creates' lines.

    7. Used TextWrangler? to open
       ~/Desktop/myapp/app/controllers/say_controller.rb
       and added the lines
       ->def hello
       ->end
       and saved the file.

    8. Then I created a file containing
       <html>
       <body>
       <h1>Hello Dr. Dave!</h1>
       </body>
       </html>
       and saved it as
       ~/Desktop/myapp/app/views/hello.rhtml

    9. In a browser, I went to http://localhost:3000/say/hello
       and saw:
       Hello Dr. Dave!

   10. Then I created a file containing
       create table students (
       id INTEGER PRIMARY KEY,
       name VARCHAR(100));
       and saved it as
       ~/Desktop/myapp/db/schema.sql

   11. In the Terminal window:
       cd ~/Desktop/myapp/db
       sqlite mydb < schema.sql
       This created a binary file named 'mydb'.

   12. Edited the file ~/Desktop/myapp/config/database.yml; changed:
       development:
       adapter: mysql
       database: myapp_development
       username: root
       password:
       host: localhost
       to
       development:
       adapter: sqlite
       database: db/mydb
       host: localhost
       Also changed adapter and database under 'test:' accordingly.

   13. In the Terminal window:
       cd ~/Desktop/myapp
       ruby script/generate scaffold Student
       This should generate many 'exists', 'creates', and possibly  
'identical' lines, but no 'error' lines. 