Chris

Thank you very much, I'm on the straight and narrow now. The ability to
build multiple configurations and just persist them is magic. 


> sdrBackplane := myMagmaSession root at:
> 'SDRBackplane'
> 
> to get a reference and then
> 
> myMagmaSession root: sdrBackplane
> MagmaSession cleanup
> myMagmaSession root removeKey: 'SDRBackplane'

>> There's no need to reset the root again, it was
>> already there since you just got it in the first line.

Sorry, bad copy and paste.

>> The cleanUp is just an old sort of 'advanced utility'
>> method for dereferencing objects from temps in
>> MethodContexts..  It has nothing to do with removing
>> anything from a database, just from image memory; I'm
>> actually not sure whether its needed anymore since I
>>discovered #fixTemps..

That explains why it cleaned out objects in my image that I couldn't
seem to get rid of.

>> I line 3 is wrapped in a commit, as in:

>>  myMagmaSession commit: [ myMagmaSession root
>> removeKey: 'SDRBackplane' ]

Of course, having a bit of a blond day.


>> Ah, ok.  So maybe the connectors should maintain their
>> state in the World at runtime..  Hard to know.

For the moment I'm happy I can work round that.

> So if you tell me how to delete objects reliably
> from Magma I think I might
> be there.

>> Dereferencing any sub-part of your object-model is a
>> matter of changing the reference to point to the nil
>> object (wrapped in commit, of course).

Everything cleaned so now I can start building.

 - Bob
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