complex query

[Hilaire Fernandes]

 From a Magma collection I need to fetch some of its elements according 
to complex query. Attribute of these elements contain another collection 
from which I need to test for the values to be able to select the 
elements I want. Really I don't know how I can do that with a where:[]

What I would like to do is:

myCollection where: [:each| each isRespondingTrueToMyCriteria: someCriteria]

But it is not possible with the index

The only alternative I found is to enumerate all the collection, which 
is extremely slow when Magma server and client are on different nodes in 
the Internet.

Any ideas or tips?

Hilaire