Object in hidden_field_tag becomes nil when partial is called into an index (yet, works in individual Show view) - ruby-on-rails-3.1

Question

Rails 3.1.3
I am making a simple site where people can share short stories and can rate those stories on a 5 Star rating system. The Star rating system is the problem. I can get it to work fine in the stories/show.html view, but not on the indexed home page. Here is my code:
home.html.erb
<% content_for(:scripts) do %>
<%= javascript_include_tag 'rating_ballot'%>
<% end %>
<div id="talesFeedHome">
<p class="notice"><%= notice %></p>
<%= render #tales.sort_by { |tale| tale.created_at }.reverse %>
</div>
<p class="clear"> </p>
tales/_tale.html.erb
<% if signed_in? %>
<div id="homeTales">
<ul>
<div id="taleShow">
<div id="controlPanel">
<li id="taleUserName"><%= tale.user.name %></li>
<li id="averageRating"> Your Rating:<br /><%= render "tales/stars" %></li>
</div>
<div id="taleDisplay">
<li><%= link_to(tale) do %>
<span><%= tale.title %> </span>
<span><%= tale.content %></span>
<% end %>
</li> <br />
</div>
</div>
</ul>
</div>
<% else %>
...
tales/_stars.html.erb
<div id="starRating">
<%= form_for(rating_ballot, :remote => true, :html => { :class => 'rating_ballot' }) do |f| %>
<%= f.label("value_1", content_tag(:span, '1'), {:class=>"rating", :id=>"1"}) %>
<%= radio_button_tag("rating[value]", 1, current_user_rating == 1, :class => 'rating_button') %>
<%= f.label("value_2", content_tag(:span, '2'), {:class=>"rating", :id=>"2"}) %>
<%= radio_button_tag("rating[value]", 2, current_user_rating == 2, :class => 'rating_button') %>
<%= f.label("value_3", content_tag(:span, '3'), {:class=>"rating", :id=>"3"}) %>
<%= radio_button_tag("rating[value]", 3, current_user_rating == 3, :class => 'rating_button') %>
<%= f.label("value_4", content_tag(:span, '4'), {:class=>"rating", :id=>"4"}) %>
<%= radio_button_tag("rating[value]", 4, current_user_rating == 4, :class => 'rating_button') %>
<%= f.label("value_5", content_tag(:span, '5'), {:class=>"rating", :id=>"5"}) %>
<%= radio_button_tag("rating[value]", 5, current_user_rating == 5, :class => 'rating_button') %>
<%= hidden_field_tag(:tale_id, #tale.id) %>
<% end %>
</div>
It is at this point, in the hidden field tag, that I get this error:
Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id
Here are the 3 relevant controllers:
pages_controller.rb
class PagesController < ApplicationController
def home
#tales = Tale.all
end
end
tales_controller.rb
class TalesController < ApplicationController
respond_to :html, :js
def new
#tale = Tale.new
end
def show
#tale = Tale.find(params[:id])
end
def index
#tales = Tale.all
#tale = Tale.find(params[:id])
end
...
ratings_controller.rb
class RatingsController < ApplicationController
before_filter :authenticate_user!
respond_to :html, :js
def create
#tale = Tale.find_by_id(params[:tale_id])
#rating = Rating.new(params[:rating])
#rating.tale_id = #tale.id
#rating.user_id = current_user.id
if #rating.save
respond_to do |format|
format.html { redirect_to #tale, :notice => "Your rating has been saved" }
format.js
end
end
end
def update
#rating = current_user.ratings.find_by_tale_id(params[:tale_id])
#tale = #rating.tale
if #tale and #rating.update_attributes(params[:rating])
respond_to do |format|
format.html { redirect_to #tale, :notice => "Your rating has been updated" }
format.js
end
end
end
end
The problem is here somewhere. Somehow when rendering #tales on the home page, this invalidates the #tale.id on the _stars partial. I can not figure out how to solve this. Thank You.

Answer 1

ok, I think your value of #tales is nil so please do the following things and let me know what would be the result
first put raise #tales.Inspect in your home method in your PagesController
second <%= raise tale.inspect%> in _tale.html.erb.
want to check weather value of tale is null or not.