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

[Mats Persson]

On 7 Jun 2006, at 21:13, David Matuszek wrote:

> 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 Locomotive documentation I've found is the seriously out of date  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

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.

So I think the correct workflow goes something like this:

-- run db:migrate to ensure that you can communicate with your db

--  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

----
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