[Qgis-user] get length of "custom" geometry in expression

[Raymond Nijssen]

Im' trying to do this in my label expression:

length($geometry)

but it always returns 0. Is there a way I can do that? I tried 
getlength() and getLength() as well, without luck.

I know there is the $length which works on the geometry right away, but 
i am performing a transformation first:

length( transform($geometry, 'EPSG:3857', 'EPSG:3006') )

Hoping anyone can help!

Raymond