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Re: programmatically updating an MO's attribute/field {MOC is updated, but data is NOT stored}

Subject: Re: programmatically updating an MO's attribute/field {MOC is updated, but data is NOT stored}
From: "Frederick C. Lee" <email@hidden>
Date: Tue, 31 Jan 2006 14:23:01 -0800
Delivered-to: email@hidden
Delivered-to: email@hidden

I'm trying to be able to load a particular set of MO attributes into a common edit area, the 'main' screen.

The 'main screen' is a split screen shared by a NSImageView and a NSTextView (a geographical map and info).

I have a series of panels (sheets) that are specific to a particular MO in a hierarchy.

For example:  [Region] -->> [Countries] --->> [Provinces] ---> [Cities]

Each level of the hierarchy has the same structure, inherited from a common abstract parent. Hence each level has its own memo (NSAttributeString).

They all share access to a [Map] entity that contains their respective maps.

The user can select a [Region] sheet or .... a [Cities] sheet.

Of course, the cities sheet contains a stack of NSPopUpButtons to reflect the hierarchy.

Example:  [Regions].......[Cities] [cityMaps].

The user selects the particular Map of a Geographical Entity (Region...Cities) which populates the MAIN viewing area comprised of split panel (map/info).

I thought that the user can enter a memo, etc. in the MAIN viewing area, and then update the respective Entity somehow; mindful of the fact that the receiving target can change per selected geographical entity.

Hence:

[Main NSTextView] ---- (1:1) ---> [region memoData]  or...
[Main NSTextView] ---- (1:1) ---> [country memoData] ... etc.

I thought there would be a clean way of doing this, programmatically.

But considering the potential memory links and bugs, perhaps I should just stick with an unbound MAIN view area and merely COPY the contents between

the sheet's NSTextView (currently not in design) and the Main (at the front-end) versus back-end MO update.

This would make the sheet bigger, adding the NSTextView which would be copied to the Main NSTextView; vs merely selecting the object and do the editing solely within the Main view.

Your observation/critique is warmly appreciated!

I guess I should just keep it simple.

Ric.


On Jan 30, 2006, at 2:47 PM, Matt Neuburg wrote:

On or about 1/30/06 12:15 PM, thus spake "Frederick C. Lee"
<email@hidden>:

I've decided to populate the binary 'memoData' field to avoid a
layout error.
The MOC appears okay before saving.    But the Save (without error)
doesn't actually
save the memoData.

Any Ideas?

Ric.

1) The Code:

     EntityManagedObject *theObject = [[gvRegionMapController
selectedObjects] objectAtIndex:0];
     NSAttributedString *myString = [[NSAttributedString alloc]
initWithString:@"Hello World!"];
     NSData *myData = [NSData dataWithData:[NSArchiver
archivedDataWithRootObject:myString]];

     [theObject setValue:myData forKey:@"memoData"];

     [gvRegionMapController removeObject:[[gvRegionMapController
selectedObjects] objectAtIndex:0]];
     [gvRegionMapController addObject:theObject];

     [theObject release];
     [myData release];

You've got memory management problems out the wazoo here. (And I still don't understand why you're removing the object only to add it again.) m.

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