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Re: Newbie D2JC Context-Sensitive Dropdowns
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Re: Newbie D2JC Context-Sensitive Dropdowns


  • Subject: Re: Newbie D2JC Context-Sensitive Dropdowns
  • From: David Avendasora <email@hidden>
  • Date: Tue, 6 Dec 2005 06:23:29 +0000

Dave,

Based on the lack of responses from the list, I doubt there is a ready-made way of doing this which seems odd as this seems to be something that any decent-sized D2JC project would need.

I'm also going to submit it to a couple other WO lists and directly to a couple of the more knowledgeable people on the wo-dev list. In the end I believe I (we) will need to create this functionality from scratch. I think it will mean writing fetch specifications on the entity that will populate the drop-down and calling that instead. It looks like if I do this the only way to make use of a custom FS in D2JC is to freeze the interface and add my own interface elements.

Dave



On Dec 5, 2005, at 7:32 PM, David Howes wrote:

Dave,
I had hoped to see a reply to this question by now. I'm still way behind you but I did finally find Assistant, I was looking in the Xcode Tools menu instead of the app's. I'm trying to develop enough of a prototype to get some interest from the company I used to work for. It is a framework for describing C4ISR architectures, (DOD), based upon a large ER model (300+ entities). I think your question is very relevant to my need to have pick-lists for attributes be able to be updated based upon other inputs and be based on entity data in the DB. The idea is to develop a semantically constrained vocabulary which describes the architecture and builds a glossary and ER model for the arch., which are 2 of the products produced by the description. I am currently trying to understand the options for populating the EOOneValueEnumerationController, which is also what I think I should be using.


Looking forward to an answer on your question

Regards,

Dave


On Dec 1, 2005, at 4:21 AM, David Avendasora wrote:

Hi all,

This is a newbie question. I am building a Direct to Java Client app and I've got the data and object models and the basic screens pretty well nailed down. I'm now starting to add some business logic into the application.

I have no problem creating the custom classes, setting defaults or adding additional actions but I'm drawing a blank when it comes to making EOOneValueEnumerationControllers context sensitive.

I want to limit the number of options available for a given attribute depending upon other attributes in the same object. For example, once I specify that the unitOfMeasureType a given object is "length" then I only want to see unitOfMeasure values that are of type "Length" instead of seeing all of the types which include weight, volume, etc.

Right now I am simply displaying ALL the possible unitOfMeasure values in the database in the drop-down, only some of which are valid for any given object.

I'm assuming that I will do it by calling a fetch specification, but I can't find any examples of this in any of the WO books I have, or Apple's examples. If they are there and I've just missed them, please point me to them.

Thanks,

Dave
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References: 
 >(no subject) (From: David Avendasora <email@hidden>)
 >Newbie D2JC Context-Sensitive Dropdowns (From: David Avendasora <email@hidden>)

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