define relationschip external database-scheme

[Remco Zwaan]

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';


Grtz..remco

 

[Jano Svitok]

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