Re: [flexcoders] need solution/best practice regarding VO's

Fri, 14 Jul 2006 17:41:00 -0700

...
>On one hand: Class mappings won't work with VO's insite another VO.
...
This works for me
public class FaceVO implements ValueObject{
...
        public var printAreas:Array
    }
in component that binds  vo (FaceVO instance)
for(var i:uint=0;i<data.printAreas.length;i++){

            var row:PrintAreaVO=PrintAreaVO(data.printAreas[i])
            //trace("is instance: "+(row is PrintAreaVO)) //traces "is instance:  true"
}

Robert Was


Andrea Varga wrote: 

  

  
Hi All!

  

I'm going to ask my question through an example. (I'm using Cairngorm, 

but I think the problem is general)

Let's say I have a database with 2 tables:

  

1. user -> with fields: user_id, user_name, user_country_id
(foreign 

key from country table)

2. countries -> with fields: country_id, country_name

  

Let's say I need an application that lists all the users, in a datagrid
  

with 2 columns: User Name, Country Name.

How should I approach this?

  

Let's say I have 2 VO's, to reflect the database structure:

  

class UserVO {

public var ID:int;

public var name:String;

public var countryID:int;

}

  

class CountryVO {

public var ID:int;

public var name:String;

}

  

And I have in my Model:

  

users:ArrayCollection; // array collection of UserVOs

countries:ArrayCollection; // array collection of CountryVOs

  

How could I create a binding of users to a Datagrid, so it will display
  

the country names?

Or how else should I approach the problem?

  

In case I have:

class UserVO {

public var ID:int;

public var name:String;

public var country:countryVO;

}

  

I think the bindig would be possibe, but a bunch of other 

questions/problems appear.

Eg.:

I'm using remoting to get the data from the server (AMFHP). 

On one hand: Class mappings won't work with VO's insite another VO.

On second hand: I have to load the list of countries (I need it 

somewhere else), and I would not want to carry the CountryVO inside the
  

UserVO, for many reasons. One of them is: this is a simple example, but
  

what if CountryVO is a more complex data, and i need to send a userVO
to 

the server (to update the database for example), I don't need a 

CountryVO there, just a UserVO that has the ID of a country.

  

Thanks,

Andi
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