Populating mx:ComboBox with database info

Question

Ok, so I set out on a quest to populate <mx:ComboBox with
info from a database using Flex and Ruby on Rails. I had a really
hard time finding tutorials about this subject, but using
information from a large set of tutorials and tweaking the code
over and over, I finally figured out something that works.
My model is sourcer
My controller is sourcers and contains the followign code:
class SourcersController < ApplicationController
def create
@sourcer = Sourcer.new(params[:sourcer])
@sourcer.save
render :xml => @sourcer.to_xml
end
def list
@sourcer = Sourcer.find :all
render :xml => @sourcer.to_xml
end
def update
@sourcer = Sourcer.find(params[:id])
@sourcer.update_attributes(params[:sourcer])
render :xml => @sourcer.to_xml
end
def delete
@sourcer = Sourcer.find(params[:id])
@sourcer.destroy
render :xml => @sourcer.to_xml
end
end
My migration file had this code:
class CreateSourcers < ActiveRecord::Migration
def self.up
create_table :sourcers do |t|
t.column :sourcername, :string
t.timestamps
end
end
def self.down
drop_table :sourcers
end
end
and finally the application code contained:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute" >
<mx:HTTPService id="listSourcers" url="
http://localhost/sourcers/list"
useProxy="false" method="GET"/>
<mx:VDividedBox x="0" y="0" height="100%"
width="100%">
<mx:Panel width="100%" height="300" layout="vertical"
title="Create/Update Denial Reasons">
<mx:Form>
<mx:FormItem>
<mx:ComboBox
dataProvider="{listSourcers.lastResult.sourcers.sourcer}"
labelField="sourcername"
creationComplete="listSourcers.send()"/>
</mx:FormItem>
</mx:Form>
</mx:Panel>
</mx:VDividedBox>
Now this can be condensed to the following important items:
<mx:HTTPService id="listSourcers" url="
http://localhost/sourcers/list"
useProxy="false" method="GET"/>
<mx:ComboBox
dataProvider="{listSourcers.lastResult.sourcers.sourcer}"
labelField="sourcername"
creationComplete="listSourcers.send()"/>
Things to note -
- if you leave out the labelField="sourcername" in the
<mx:ComboBox> tag you will "object: Object" in the dropdown
after compile.
- if you leave out the
creationComplete="listSourcers.send()" in the <mx:ComboBox>
you will get a dropdown that is blank, but is sized correctly. Also
something to note on this line is it can be included in the
<mx:Application> tag but then if you have multiple ComboBoxes
you're going to need it in each of the <mx:ComboBox> tags.
Anyway, I hope this helps someone.

Answer 1

Hi,
Try logic similar to this instead:
listOfIds as String[]
for each element in
    SELECT prsnombre
    FROM nameOfYourTable
    WHERE prsrut = 12486023
do
    listOfIds[] = element.prsnombre
end
return listOfIdsThis logic assumes that "prsnombre" is the name of the attribute you want returned, "nameOfYourTable" is the table's name and "prsrut" is the attribute with one or more rows in the table that has the value 12486023.
The underscore characters in tables and columns are a bit wacky unless you are using something called Dynamic SQL. The above statement does not use Dynamic SQL and note that I did not include them in the logic. Not sure if this is your problem, but try it without the underscore characters if your logic uses the JDBC SQL syntax shown above.
Hope this helps,
Dan