in resource routes, you normally have a pluralized model name:
map.resource :feedbacks
the you get: 1) feedbacks_path # => GET/POST /feedbacks/ (for getting a list of items or creating a new one.) 2) feedback_path(@feedback) #=> GET/PUT/DELETE /feedbacks/ID_OF_GIVEN_FEEDBACK (for getting/updateing/deleting a specific record with a given ID) see the difference? feedback_path <-> feedbackS_path
try this <%= form_tag(feedbacks_path) %>
But also i think as your resource name is not pluralized something gets mixed up somewhere along the way of these routing helpers, and the error could still be there. That it worked in 1.2.1 and not in 1.2.3 may be due to some code changes in this area .... try pluralizing your resource name in routes.rb too.
