I am a RoR neophyte, and my first foray into Ajax has not gone well. I
am working on an example out of the book Rails Up and Running, and
while I have faithfully replicated the code, nothing seems to be
working.
Here are the code fragments:
app/controllers/slideshows_controller.rb (partial)
def show
@slideshow = Slideshow.find(params[:id])
session[:slideshow] = @slideshow
session[:slide_index] = 0
@slide = @slideshow.slides[0]
end
def show_slide
@slideshow = session[:slideshow]
session[:slide_index] += 1
@slide = @sildeshow.slides[session[:slide_index]]
if @slide == nil
session[:slide_index] = 0
@slide = @slideshow.slides[0]
end
render :partial => "show_slide"
end
app/views/slideshows/show.html.erb
<p><i><%=h @slideshow.name %></i></p>
<% if @slide %>
<div id="slides">
<%= render :partial => "show_slide" %>
</div>
<%= periodically_call_remote :update => "slides",
:url => { :action => :show_slide },
:frequency => 2.0 %>
<% end %>
app/views/slideshows/_show_slide.html.erb
<%= image_tag "photos/#[email protected]}" %>
<p><%= @slide.photo.filename %></p>
app/views/layouts/application.html.erb (partial)
<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8" />
<title>Photos: <%= controller.action_name %></title>
<%= javascript_include_tag :defaults %>
<%= stylesheet_link_tag 'application', 'photos' %>
<%= stylesheet_link_tag 'slideshows' %>
</head>
Instead of a nice slideshow in Ajax, I get the following text with
photo info:
Basket
basket.jpg
and then this error:
NoMethodError in SlideshowsController#show_slide
You have a nil object when you didn't expect it!
The error occurred while evaluating nil.slides
Any help would be greatly appreciated.
Mark
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