I'm working with the output of a SpatialRelator Transformer in my
workspace. The features contain a node_id from the source node and a
list containing the line_id of the connected line segments as well as
the node_id for the endpoints of each line segment. So the attribute
set looks like this:
node_id
_relationships{}.line_id
_relationships{}.from_node_id
_relationships{}.to_node_id
The problem is that I want to add a new element to the list that
contains the node_id (either the from_ or to_ node_id) which is not
the same as the feature's node_id.
That is:
_relationships{}.other_node_id = \
(node_id != _relationships{}.from_node_id) \
? _relationships{}.from_node_id \
: _relationships{}.to_node_id
I thought I could use the ExpressionEvaluator Transformer, but since I
am dealing with a variable-sized list, I could not see how to expose
the variable number of list elements.
I don't see a ListExpressionEvaluator Transformer, but I think that is
what I'd need to do this. Does anyone have any clues on dealing with
the list manipulators?
Thanks,
Thom
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