From: Jano Svitok <jan.svitok@...>
Date: 2008-03-06T18:38:44+09:00
Subject: Re: define relationschip external database-scheme

On Thu, Mar 6, 2008 at 9:04 AM, Remco Zwaan wrote:
> Hi,
>
>  i want to use or external database for my rails app. The connention to
>  the external database(no-rais-app) works fine, but how must i define the
>  relationship between this tabels (if possibly no change in the table
>  scructure)
>
>  The external database-scheme:
>
>  CREATE TABLE `bestemmingen` (
>   `bestemming_id` char(3) NOT NULL default '',
>   `naam` varchar(50) default NULL,
>   `naam_en` varchar(50) default NULL,
>   `landcode` char(2) default NULL,
>   `airport_name` varchar(100) default NULL,
>   `alt_naam` varchar(50) default NULL,
>   `dist_ams` decimal(6,1) default NULL,
>   `stad_zoeknaam` varchar(50) NOT NULL default '',
>   PRIMARY KEY  (`bestemming_id`),
>   KEY `land_id` (`landcode`),
>   KEY `stad_zoeknaam` (`stad_zoeknaam`)
>  ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Bestemming iatacode en
>  iso bestand';
>
>  CREATE TABLE `landen` (
>   `landcode` char(2) NOT NULL default '',
>   `naam` varchar(50) NOT NULL,
>   `naam_en` varchar(50) NOT NULL,
>   `alt_naam` varchar(200) NOT NULL,
>   `landafk` char(3) default NULL,
>   `land_zoeknaam` varchar(100) NOT NULL default '',
>   PRIMARY KEY  (`landcode`),
>   KEY `land_zoeknaam` (`land_zoeknaam`)
>  ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Landen opzoek tabel';

(excuse my lack of Dutch ;-)

class Land < ActiveRecord::Base
  set_table_name "landen"
  has_many :bestemmingen, :class_name => "Bestemming" # land_id will be guessed
end

class Bestemming < ActiveRecord::Base
 set_table_name "bestemmingen"
 belongs_to: :land # land_id will be guessed
end

Note: Next time try to ask directly on rails google group, you'll get
much better answer there.
Note 2:I haven't worked with rails for a long time, so take this as a
direction, not ready code.
Note 3:You can find all this on api.rubyonrails.com, in the part about
ActiveRecord.

Jano