Rails - Mar 2005 - Accessing Models from Modules: what am I missing?

I''ve been playing around with Ruby and Rails for a couple of months
now.  I''m trying to develop a module/gem that will provide some
functionality on top of a given database setup.  As such, I''m trying
to call an ActiveRecord Model from within the module code (which is
then mixed into a Rails controller).  However, apparently, code in the
module can''t see/create objects that can been seen/created directly in
the Controller.

Here''s some (untested) sample code to get a feel for what I''m
trying to do:

module AddOn
  def create_user(username)
    u = User.new
    u.username = username
    u.save
  end
end

class User < ActiveRecord::Base
end

class TestController < ApplicationController
  include AddOn

  def create
    create_user(''jsmith'')
    render_text ''done!''
  end
end

Start WEBRick and visit /test/create and I get a NameError:
uninitialized constant AddOn::User.

So maybe this is more of a generic Ruby question, and please call me
out if this is out of line for this list.  Thanks!

David Adams

On 22.3.2005, at 06:38, David Adams wrote:
> I''ve been playing around with Ruby and Rails for a couple of
months
> now.  I''m trying to develop a module/gem that will provide some
> functionality on top of a given database setup.  As such, I''m
trying
> to call an ActiveRecord Model from within the module code (which is
> then mixed into a Rails controller).  However, apparently, code in the
> module can''t see/create objects that can been seen/created
directly in
> the Controller.
You have to suck in the user class file. Put:

require ''user''

in the beginning of the module file.

//jarkko
>
> Here''s some (untested) sample code to get a feel for what
I''m trying
> to do:
>
> module AddOn
>   def create_user(username)
>     u = User.new
>     u.username = username
>     u.save
>   end
> end
>
> class User < ActiveRecord::Base
> end
>
> class TestController < ApplicationController
>   include AddOn
>
>   def create
>     create_user(''jsmith'')
>     render_text ''done!''
>   end
> end
>
> Start WEBRick and visit /test/create and I get a NameError:
> uninitialized constant AddOn::User.
>
> So maybe this is more of a generic Ruby question, and please call me
> out if this is out of line for this list.  Thanks!
>
> David Adams
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
--
Jarkko Laine
http://jlaine.net
http://odesign.fi


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