I'm trying to trim my list attribute down to a single entry (the first, index 0). I've used ListIndexer, but I can't seem to get it right.
Is there a simple way to accomplish this ? Or do I need to resolve to TCL or Python (if this is at all possible) ?
Cheers
Lars I Nielsen
Best answer by takashi
+30
+15
But it wil only result in a single attribute if the list consist of just 1 attribute.
More attributes, more merrier :)
You also may want to dump the list bit after the indexer. Else u still tag along the list. (unless u still need it at that outputjuncture)
+19
Do you perhaps need to remove list elements except the first one? If so, there isn't a suitable transformer to do that exactly, but this combination is available. ListIndexcer (List Index: 0) AttributeRemover (Lists to Remove: MyList{}) AttributeRenamer (Old Attribute: MyList, New Attribute: MyList{0}) Of course, both the PythonCaller and the TclCaller can be also used. Python Example: -----
import fmeobjects def trimMyList(feature): myList = feature.getAttribute('MyList{}') if myList: for i in range(1, len(myList)): feature.removeAttribute('MyList{%d}' % i) -----
Tcl Example:
-----
proc trimMyList {} { for {set i 1} {[FME_AttributeExists "MyList{$i}"]} {incr i} { FME_UnsetAttributes "MyList{$i}" } } -----
Takashi
I prefer Takashi's answer with Python, as it's neat and clean.
However, in a workspace test setup it worked perfectly, but in my production setup it fails. I use ListPopulator in the test setup, but I use AttributeAccumulator in my production setup.
Apparently "LIST{}" (aka MyList{}) isn't available when using Attribute Accumulator :-(
The attribute set after AttributeAccumulator contain multiple "list" entries, like this:
LIST{0}.FIRST
LIST{0}.SECOND
LIST{1}.FIRST
LIST{1}.SECOND
LIST{2}.FIRST
etc.
How must I change the Python script to accomodate for this difference ?
Cheers
Lars I.
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