[Locomotive-users] Re: Locomotive-users Digest, Vol 9, Issue 5

Sat Jun 10 00:50:32 GMT 2006

>
> OK, this one is easy, and it's a mistake I've done as well before.
>
> 1.	Before using the scaffold script OR the scaffold method in a
> controller, you *must* have created the db table with the required
> fields and so on.

I'm pretty sure I've done that. (My steps 10 and 11.)

> So I think the correct workflow goes something like this:
>
> -- run db:migrate to ensure that you can communicate with your db

I'm sorry to be so dense, but I'm reading the books you mention;
I'm good with languages, but not with configuration. I'm trying to
adapt a seriously outdated movie just to get Locomotive running;
after that I can use it to learn Rails. (I learn much better from
doing than from reading!)

[Quicksilver:~/Desktop/myapp] dave% db:migrate
tcsh: db:migrate: Command not found.
[Quicksilver:~/Desktop/myapp] dave% run db:migrate
tcsh: run: Command not found.
[Quicksilver:~/Desktop/myapp] dave% ruby db:migrate
ruby: No such file or directory -- db:migrate (LoadError)
[Quicksilver:~/Desktop/myapp] dave% ruby
db:migrate
-:1: undefined method `db' for main:Object (NoMethodError)
[Quicksilver:~/Desktop/myapp] dave% irb
irb(main):001:0> db:migrate
NoMethodError: undefined method `db' for main:Object
         from (irb):1
irb(main):002:0> rake db:migrate
(irb):2: warning: parenthesize argument(s) for future version
NoMethodError: undefined method `db' for main:Object
         from (irb):2
irb(main):003:0> exit

I don't get the colon--it's not indicating a symbol or an
if-then in Ruby, and I know it's not Unix. Also, 'migrate'
isn't in any of my Ruby, Rails, or MySQL books, and from
what I can glean from the Web, it's far more complex than
what I should need for a trivial database.

I hate to ask, but are there maybe just some simple explicit
steps that I could add to what I've been doing?

Sorry to be such a dunderhead.

   --Dave

     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.

>
> --  script/generate model Student
>
> --  edit the generated /db/migrations/001_create_students.rb file  
> and  
> add your table fields.  NB!! Use the Rails Migrations instead of SQL,
> it's better in every way.
>
> -- run rake db:migrate
>
> -- and then run your script/generate scaffold Student
>
> -- things should now be working just great ! (IF not, come back to  
> me/ 
> list)
>
>
> The final and *most important* step ;-) is go visit this website
> [ http://pragmaticprogrammer.com/titles/rails/index.html ] with your
> creditcard in hand, and plonk down the US$23,50 for the 2nd edition
> of "Agile Web Development with Rails".  It is so worth your time and
> money, just trust me :-)
>
> You might also want to look at Ruby For Rails by David A. Black,
> also a good point to start with.
>
> Hope that will have helped you get going again
>
>
> Kind regards,
>
> Mats
>
> ----
> "TextMate, coding with an incredible sense of joy and ease"
> - www.macromates.com -
>
> "RubyOnRails development done the Mac way"
> - locomotive.raaum.org -
>
>
>
>
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>
>
> End of Locomotive-users Digest, Vol 9, Issue 5
> **********************************************