Hi,

On 1 May 2011, at 00:25, Alexandre Bergel wrote:

Hi!

I often bump into a problem having the following gist:

view nodes: #( $a $b $a). view edgesFromAssociations: { $a -> $b . $b -> $a} -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

How can I express the the second $a and not the first when defining edges? I have the impression this limitation comes from the fact that two different nodes have the same model behind ($a), and there is no way to distinguish between them.

Yes. But that is not a limitation, it is a feature that comes from the following idea: we want by default the user to manipulate the domain objects, not the graph model. This is why the edges* selectors provide a lookup based on the heuristic that a domain object will appear only once in the graph.

An easy and backward compatible solution would be to permit to provide nodes:

nodes := view nodes: #( $a $b $a). view edgesFromAssociations: { nodes first -> nodes second . nodes second -> nodes third } -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Opinion?

Well, edges* selectors are meant to be used as transformations as explained above. For direct edges, we should use another class. I would suggest: - directEdges - rawEdges

Cheers, Doru

Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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