canvas-lms/app/views/errors/index.html.erb

<% 
  content_for :page_title, "Error Reports"
  add_crumb "Error Reports"
%>

<% form_for @current_user, :url => '/error_reports', :html => { :method => :get }  do |f| %>
  Message contains
  <input type="text" name="message" value="<%= @message %>" style="width: 250px;"/>
  <button type="submit" class="button">Search</button>
<% end %>

<%= will_paginate(@reports) %>
<% @reports.each do |report| %>
  <div style="margin-bottom: 20px;">
    <h3><%= report.message %></h3>
      <div style="border: 1px solid #eee; -moz-border-radius: 5px; padding: 5px 20px;">
      <%= report.created_at %><br />
      <%= report.url %><br/>
      <% if report.user_id %>
        <%= link_to report.user.try(:name), user_url(report.user_id) %>
      <% end %>
      <% (report.data || {}).each do |k,v| %>
        <br><%= k %>: <%= v %>
      <% end %>
      <pre style="font-size: 0.8em; margin-left: 20px; height: 150px; overflow: auto;">
        <%= report.backtrace %>
      </pre>
    </div>
  </div>
<% end %>