[Helma-user] Adding objects to generic object reference in onPersist()

[Anton Pirker]

Just a little update!

I patched my local Helma and made me my own afterPersist()-Call and 
tried the same thing. Same result.

When i was debugging my Application with the debugger shipped with Helma 
i recognized, that there is some bug in the watch-window.
I was watching "this" and when the code jumped into a constructor() the 
"this" didn't change. So if i am in Venue-Code "this" is "[HopObject 
Venue]". When the code jumps into the constructor() of Change, "this" 
remained "[HopObject Venue]"! When i use app.log() to debug "this" 
changes to "[HopObject Change]".

But back to my problem: I don't have a clue how to solve the Problem. 
(Of course i could solve it somehow with database Triggers, but i would 
prefer to do it with Helma)

Does no one has a clue or a hint for me? Every help is appreciated.
I wonder if no one has dome something like this before..


Cheers,
Anton






Anton Pirker schrieb:
> Hi List!
> 
> I have a Prototype 'Change'. This is some sort of changelog for 
> HopObjects. I add it to Objects via a generic object reference (as 
> described at [1])
> 
> Everythink works fine if i add the Change the normal way to my object, 
> like:
> 
>   var venue = new Venue("Supervenue");
>   var ch = new Change(u);
>   venue.changes.add(ch);
> 
> 
> 
> But i want to add the Changelog automatically. So i wrote a onPersist() 
> in HopObject.
> 
> So everytime when i store something i do the following:
> 
> function onPersist() {
> 
>   //check if we have a collection
>   //to store the changes to
>   if(this.changes) {
>     //create the change and add it.
>     var ch = new Change(u);   
>     this.changes.add(ch);
>   }
> }
> 
> 
> But the Change is not stored into the Database and I do not get an error 
> message.
> 
> 
> I think it is because onPersist is called right before the object is 
> stored. So when a create a 'Change' object and add it to a 
> 'changes'-collection of this in onPersist this does not have an finale 
> id and so the 'Change'-Object does not know who his parent is.
> 
> I also wrote a little demo-app to explain it a little better.
> 
> Does anyone know how i can achieve this, or i what i am doing wrong?
> 
> Thanks in advance!
> Anton
> 
> [1] http://helma.org/bugs/show_bug.cgi?id=516
> 
> 
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