Just for collective knowledge as I have found no info on this problem
online:
I solved this by adding an .html.erb file for the “missing template”,
since
by design or bug Rails3 will not find or render another controllers view
(in
my experience). Then in the new html.erb file, I just put <%= render
“comparisons/display” %> because the views are able to find templates
from
another controller.
It seems like this is more work, but I can see that perhaps this was
done by
design as it forces me to more cleanly define what the controller
actions
render.