RoR: Collection_select not working - ruby-on-rails

Question

UPDATED
The official docs for this are not the best and a little confusing. I am gathering options from a feedback table and rendering them in a dropdown on a form and then saving them in a table called "answers" and column called "feedback_request" using collection_select:
<%= f.collection_select :feedback_request, Feedback.order(:feedback_option), :id, :feedback_request, {prompt: "Feedback"}, {class: "select large-1 behaviourForm"} %>
Answers table:
create_table "answers", force: :cascade do |t|
t.integer "user_id", limit: 4
t.string "subject", limit: 4
t.string "source", limit: 45
t.text "description", limit: 65535
t.string "significance", limit: 45
t.string "feedback_request"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "answers", ["feedback_request"], name: "feedback_index"
add_index "answers", ["significance"], name: "signif_index"
add_index "answers", ["source"], name: "source_index"
add_index "answers", ["subject"], name: "FK_HOM_MOD_idx"
add_index "answers", ["user_id"], name: "teacher_answer_index"
Feedback table
create_table "feedback", force: :cascade do |t|
t.string "feedback_option", limit: 45
end
Relationships
feedback.rb
class Feedback < ActiveRecord::Base
self.table_name = 'feedback'
has_many :answers, :class_name => 'Answer'
end
answer.rb
belongs_to :feedback, :class_name => 'Feedback', :foreign_key => :feedback_request
Table (as requested):
<thead>
<tr>
<% if current_user.teacher? %>
<th style="width:5%;", bgcolor="#313E4E" ></th>
<th bgcolor="#313E4E"><font color="#FFFFFF">Answer Title</font></th>
<% else %>
<th bgcolor="#313E4E"><font color="#FFFFFF">Subject</font></th>
<% end %>
<th bgcolor="#313E4E"><font color="#FFFFFF">Source</font></th>
<th bgcolor="#313E4E"><font color="#FFFFFF"><%= sort_link(#q, :created_at, "Assigned/Scheduled") %></font></th>
<th bgcolor="#313E4E"><font color="#FFFFFF"><%= sort_link(#q, :Due, "Due") %></font></th>
</tr>
</thead>
<tfoot>
</tfoot>
<%= form_tag destroy_multiple_answers_path, method: :delete do %>
<% #answers.each do |answer| %>
<tbody>
<tr>
<% if current_user.teacher? %>
<td><%= check_box_tag "answer[id][]", answer.id, class: "narrowtr" %></input></td>
<td height="1"><font color="#000000"><%= link_to answer.subject, answer, class: "blackLink" %></font></td>
<% else %>
<td height="1"><%= answer.subject %></td>
<% end %>
<td height="1"></td>
<td height="1"><%= answer.created_at %></td>
<td height="1"><%= answer.Due %></td>
</tr>
</tbody>
<% end %>
</table>
This gives me the following error on submit:
**undefined method `feedback_request' for #<Feedback id: 1, feedback_option: "Curriculum Management">**
Any guidance much appreciated.