Rails - Nov 2008 - Single-table inheritance: Uninitialized class constant

This forum has been of no help before, but I am nothing daunted.

I have a "people" table, mapping to a Person ActiveRecord class, which
has two subclasses, Principal and Secondary. There is a type column.

There is a "locations" table, mapping to Location. Location belongs_to
Principal. Principal has_many Locations. There is a principal_id column
in locations.

There is a LocationsController. It renders rhtml, which contains
something like

<%= @location.principal.full_name %>

... to which Rails complains "uninitialized constant
Location::Principal". locations_controller.rb does not refer to
Principal. The problem must come from the class information in the
relationship, or possibly in the STI type information.

If I change the belongs_to to:

belongs_to :principal, :class_name => "Person", :foreign_key =>
"principal_id"

it works, but this bothers me. It is not what I intend. Locations belong
to Principals, not to People in general.

The alternative, I think, is to have locations_controller.rb require
''person'', but that gives me problems with reloading in
development mode.

What should I do?

$ ruby --version
ruby 1.8.6 (2008-03-03 patchlevel 114) [universal-darwin9.0]
$ rails --version
Rails 1.2.6
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On 11 Nov 2008, at 21:36, Fritz Anderson wrote:
>
> The alternative, I think, is to have locations_controller.rb require
> ''person'', but that gives me problems with reloading in
development
> mode.
>
use require_dependency instead of require (and i would do this at the  
top of the location model, not in the controller)

Fred
> What should I do?
>
> $ ruby --version
> ruby 1.8.6 (2008-03-03 patchlevel 114) [universal-darwin9.0]
> $ rails --version
> Rails 1.2.6
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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Frederick Cheung wrote:
> use require_dependency instead of require (and i would do this at the
> top of the location model, not in the controller)
This was exactly what I needed. Thank you.

It''s too bad that Pickaxe (2nd ed) and Agile Web Development with Rails
(2nd ed) didn''t mention require_dependency. Can anyone recommend a 
reference that would have included it?

    — F
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On Nov 12, 8:18 pm, Fritz Anderson
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Frederick Cheung wrote:
> > use require_dependency instead of require (and i would do this at the
> > top of the location model, not in the controller)
>
> This was exactly what I needed. Thank you.
>
> It''s too bad that Pickaxe (2nd ed) and Agile Web Development with
Rails
> (2nd ed) didn''t mention require_dependency. Can anyone recommend a
> reference that would have included it?
>
Well it''s a rails only thing so the Pickaxe would never cover it and
it''s also a bit of slightly hairy internal stuff. "Luke, Use the
source!"

Fred
>     — F
> --
> Posted viahttp://www.ruby-forum.com/.
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