Feature request #10650
Atlas printing: getting access to the $atlasfeature record in expressions
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It would be very powerful to get access to the current $atlasfeature database records with all attributes to use these values in expression functions and comparisons.
As a usage example it would be very handy to filter objects of linked tables sharing common attributes based on the attribute values of the atlas coverage table. This could be used both in symbology, but also in table objects in the print composer.
See also email thread http://lists.osgeo.org/pipermail/qgis-developer/2014-June/033237.html