_form.html.erb

<%= form_for(@feedback) do |f| %>
  <% if @feedback.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@feedback.errors.count, "error") %> prohibited this feedback from being saved:</h2>

      <ul>
      <% @feedback.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :poster_id %><br />
    <%= f.number_field :poster_id %>
  </div>
  <div class="field">
    <%= f.label :receiver_id %><br />
    <%= f.number_field :receiver_id %>
  </div>
  <div class="field">
    <%= f.label :content %><br />
    <%= f.text_field :content %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

gistfile1.txt

ActionView::Template::Error (undefined method `feedback_feedback_path' for #<#<Class:0x00000103068458>:0x00000103054250>):
    1: <%= form_for(@feedback) do |f| %>
    2:   <% if @feedback.errors.any? %>
    3:     <div id="error_explanation">
    4:       <h2><%= pluralize(@feedback.errors.count, "error") %> prohibited this feedback from being saved:</h2>
  app/views/feedbacks/_form.html.erb:1:in `_app_views_feedbacks__form_html_erb___2039037845826485746_2173882680'
  app/views/home/index.html.erb:17:in `_app_views_home_index_html_erb__2518153290388327788_2175341580'

home.index.html.erb

<h1>Feedback Posted</h1>

<% @users.each do |user| %>
	<%  user.feedbacks_as_poster.each do |feedback| %>		
		<%= "#{user.f_name.capitalize}" + " " + "#{user.l_name}" + " aka '" + "#{user.username}'" %> has POSTED "<%= link_to "#{feedback.content}", feedbacks_path(feedback) %>" for '<%= feedback.receiver.username %>'<br />
	<% end %>
<% end %>

<h1>Feedback Received</h1>

<% @users.each do |user| %>
	<%  user.feedbacks_as_receiver.each do |feedback| %>		
		<%= "#{user.f_name.capitalize}" + " " + "#{user.l_name}" + " aka '" + "#{user.username}'" %> has RECEIVED "<%= link_to "#{feedback.content}", feedbacks_path(feedback) %>" for '<%= feedback.poster.username %>'<br />
	<% end %>
<% end %>

<% render "feedbacks/form" %>

new_error.txt

NoMethodError in Home#index

Showing /app/views/feedbacks/_form.html.erb where line #1 raised:

undefined method `model_name' for NilClass:Class

routes.rb

MyApp::Application.routes.draw do
  get "home/index"

  resources :roles

  resources :feedbacks

  resources :assignments

  resources :users

  root :to => 'home#index'

end