It seems evaluation of @atlas_geometry is always 'null'
exp = QgsExpression('if(@atlas_geometry is null,1,0)') // always returns 1 rq = QgsFeatureRequest(exp)
@atlas_geometry within layer's expressions seems work fine though.
I have to do double spatial filtering across two layers so I come up with writing a predicate in PyQGIS for using in layer expression. Unfortunately it seems @atlas_geometry always returns null in my python code, despite it works fine in layer expression.
Can I access @atlas_geometry in my python code as if it's in layer's expression?