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Is it possible to use a negative list index in the AttributeCreator? If not possible, why not? Any technical reason or just not implemented? Should I create an Idea for it?

Workaround is to use the ListIndexer, and AttributeRenamer but this is not really intuitive nor quick. Unlike most things in FME.

Hello @nielsgerrits,

 

This negative list element is currently not implemented into FME. However, there is an idea that has been posted. If you want to head over and post a comment/upvote that will give it more standing with developers when they go to add new features.

The idea can be found here: https://knowledge.safe.com/idea/37432/reverse-list-element-selection.html

import fme
import fmeobjects

def processFeature(feature):
    list = feature.getAttribute('_testList{}.testattribute')
    print list -1]
 

In those cases, I think it is easy to work with a pythoncaller.

I have added a small sample workspace that builds a simple list attribute. The pythoncaller is used to extract this list attribute into a new python list variable (see code above). There it is possible to use negative indices.

This is just a simple example to show you this is possible. ;) 

Hello @nielsgerrits,

 

This negative list element is currently not implemented into FME. However, there is an idea that has been posted. If you want to head over and post a comment/upvote that will give it more standing with developers when they go to add new features.

The idea can be found here: https://knowledge.safe.com/idea/37432/reverse-list-element-selection.html

Heya @trentatsafe,

 

Thanks for pointing out, I should have searched the Ideas as well before posting this question.

 

import fme
import fmeobjects

def processFeature(feature):
    list = feature.getAttribute('_testList{}.testattribute')
    print list -1]
 

In those cases, I think it is easy to work with a pythoncaller.

I have added a small sample workspace that builds a simple list attribute. The pythoncaller is used to extract this list attribute into a new python list variable (see code above). There it is possible to use negative indices.

This is just a simple example to show you this is possible. ;) 

Heya @jneujens,

 

Thanks for the working example!

 

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