Index: library/mongodb/nx-mongo.tcl
===================================================================
diff -u -r275da34d3d7a874a451eced58242b738c8a37d1a -r0f881e4bc45e927c8d84c1b1b468ef7537cb9b03
--- library/mongodb/nx-mongo.tcl	(.../nx-mongo.tcl)	(revision 275da34d3d7a874a451eced58242b738c8a37d1a)
+++ library/mongodb/nx-mongo.tcl	(.../nx-mongo.tcl)	(revision 0f881e4bc45e927c8d84c1b1b468ef7537cb9b03)
@@ -417,7 +417,7 @@
     # (eg. mongo type, or mongo operator).
     #
     :method "get slot" {att} {
-      set classes [concat [self] [:info mixin classes] [:info heritage]]
+      set classes [concat [self] [:info mixins] [:info heritage]]
       foreach cls $classes {
 	set slot [$cls info slots $att]
 	if {$slot ne ""} {