Query with several indexes

[Hilaire Fernandes]

Hilaire Fernandes a écrit :
> Hilaire Fernandes a écrit :
> 
>> IFIDbSession
>>     commit: [IFIModels links
>>         addIndex: (MaCompetencyIndex attribute: #parent);
>>         addIndex: (MaCompetencyIndex attribute: #owner);
>>         addIndex: (MaCompetencyIndex attribute: #necessary);
>>         addIndex: (MaFloatIndex attribute: #threshold);
>>         addIndex: (MaFloatIndex attribute: #transfer)]
> 
> 
> In case of doubt I updated the server image with the latest code of my 
> application. So it knows about my MaCompetencyIndex definition.
> The same error appears, but this time the error message is different:
> 'attempt to index non-existent element in an ordered collection'

Okay, I figure out index must be created before inserting any element in 
a MagmaCollection. Incidentally I realized indexes are not automatically 
updated when an indexed attribute/aspect is changed. Now I understand 
what is for the noteOldKeysFor: message.
Is it that correct?

What is the preferred solution when one need to add an index to a 
MagmaCollection already populated with elements?

Using OBDB turns to be quite complex.

Hilaire