How to create a LOV [ List of Values in a Rails Application

Dinooz · February 21, 2007, 5:04pm

I have 3 tables for a Sarbanes Oxley application. Servers , Databases
and Applications.

another set of tables for the Model: Servers_Databases,
Databases_Applications and Servers_Applications.

My question here is how can setup a LOV in order to let the join
tables have a LOV from the Servers, Databases or Applications.

How would the model be applied in has_many … :trough …

This is really cool but a little bit confusing.

Thanks in advance for your help…

./script/generate scaffold_resource Server name:string cat:string
net_face:integer ids:integer mon_man:integer mon_aut:integer
int_ip:string ext_ip:string desc:string bu_media:string
bu_method:string bu_data_freq:string os_vendor:string os:string
os_version:string

./script/generate scaffold_resource App name:string fsa:integer
fsa_logic:string description:string bu_data:string

./script/generate scaffold_resource Db name:string cat:string
description:string mon_man:integer mon_auto:integer

./script/generate scaffold_resource App_svr server_id:integer
app_id:integer

./script/generate scaffold_resource Db_app db_id:integer
app_id:integer

./script/generate scaffold_resource Db_svr db_id:integer
server_id:integer

rake db:migrate

In a restful way I have the URL’s working properly for:

http://127.0.0.1:3000/dbs/
http://127.0.0.1:3000/apps/
http://127.0.0.1:3000/servers/

http://127.0.0.1:3000/db_apps/
http://127.0.0.1:3000/db_svrs/
http://127.0.0.1:3000/app_svrs/

Now my question is how to create a LOV in order to build my
application for the Join tables in DB_APPS like to have the option to
show the LOV based on the Databases, Applications or Servers table and
not the ID. Also in the Form like to be able to select from the other
table.

For the Model how would exactly work the … has_many :trough …

Thanks in advance for your help.

Dino.

Dinooz · February 21, 2007, 6:40pm

Thank you Mike for your reply here is layout of the current tables:
3 Main tables: servers , dbs , apps [ For some reason
scaffold_resource did not like the work database/s application/s]

These 3 tables work together with the tables: app_svrs, db_apps and
db_svrs

DROP TABLE IF EXISTS prs_sarbox_development.servers;
CREATE TABLE prs_sarbox_development.servers (
id int(11) NOT NULL auto_increment,
name varchar(255) default NULL,
cat varchar(255) default NULL,
net_face int(11) default NULL,
ids int(11) default NULL,
mon_man int(11) default NULL,
mon_aut int(11) default NULL,
int_ip varchar(255) default NULL,
ext_ip varchar(255) default NULL,
desc varchar(255) default NULL,
bu_media varchar(255) default NULL,
bu_method varchar(255) default NULL,
bu_data_freq varchar(255) default NULL,
os_vendor varchar(255) default NULL,
os varchar(255) default NULL,
os_version varchar(255) default NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

DROP TABLE IF EXISTS prs_sarbox_development.dbs;
CREATE TABLE prs_sarbox_development.dbs (
id int(11) NOT NULL auto_increment,
name varchar(255) default NULL,
cat varchar(255) default NULL,
description varchar(255) default NULL,
mon_man int(11) default NULL,
mon_auto int(11) default NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

DROP TABLE IF EXISTS prs_sarbox_development.apps;
CREATE TABLE prs_sarbox_development.apps (
id int(11) NOT NULL auto_increment,
name varchar(255) default NULL,
fsa int(11) default NULL,
fsa_logic varchar(255) default NULL,
description varchar(255) default NULL,
bu_data varchar(255) default NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

DROP TABLE IF EXISTS prs_sarbox_development.app_svrs;
CREATE TABLE prs_sarbox_development.app_svrs (
id int(11) NOT NULL auto_increment,
server_id int(11) default NULL,
app_id int(11) default NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

DROP TABLE IF EXISTS prs_sarbox_development.db_apps;
CREATE TABLE prs_sarbox_development.db_apps (
id int(11) NOT NULL auto_increment,
db_id int(11) default NULL,
app_id int(11) default NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

DROP TABLE IF EXISTS prs_sarbox_development.db_svrs;
CREATE TABLE prs_sarbox_development.db_svrs (
id int(11) NOT NULL auto_increment,
db_id int(11) default NULL,
server_id int(11) default NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

When I try to open the URL:
http://192.168.2.148:3000/db_apps

I got the list of the content of the DB.

Db App
15 1 Show Edit Destroy
11 14 Show Edit Destroy
22 23 Show Edit Destroy
4 17 Show Edit Destroy
4 21 Show Edit Destroy
2 17 Show Edit Destroy
2 21 Show Edit Destroy
2 5 Show Edit Destroy
2 19 Show Edit Destroy
2 20 Show Edit Destroy

I would like to see instead of the ID of the DB or APP the Name that
belongs to that Database of the Name of the Application from the DBs
and Apps tables repectively. I might be missing something, when I
create the migration run the rake db:migrate then later edit the model
as follow:

app Model:
####################
class App < ActiveRecord::Base

has_many :servers, :through => :app_svrs
has_many :dbs, :through => :db_apps

end

app_svr Model:
####################
class AppSvr < ActiveRecord::Base

belongs_to :app
belongs_to :server

end

db Model:
####################
class Db < ActiveRecord::Base

has_many :apps, :through => :db_apps
has_many :servers, :through => :db_servers

end

db_app Model:
####################
class DbApp < ActiveRecord::Base

belongs_to :db
belongs_to :app

end

db_svr Model:
####################
class DbSvr < ActiveRecord::Base

belongs_to :db
belongs_to :server

end

server Model:
####################
class Server < ActiveRecord::Base

has_many :apps, :through => :app_svrs
has_many :dbs, :through => :db_svrs

end

Also for Edit and Add, I would like to have a Select to limit only
those values from the current values in the Database to avoid typo
errors. and what I have is an textfield instead of a select box for
the New or Edit forms.

New db_app
Db <input type = text… => Like to have a Select from the DB…
App <input type = text…
Back

Thanks in advance for your help.

Dinooz · February 21, 2007, 6:45pm