People,
I have gone through the cookbook example:
and everything worked fine an a FC4/Postgres setup.
I then tried to reproduce this success with something that would be
useful to me - a library db using books & authors tables. The author
list works but NOT the book list (unless I take line #17 out).
I get this message:
Showing app/views/book/list.rhtml where line #17 raised:
You have a nil object when you didn’t expect it!
The error occured while evaluating nil.last_name
Extracted source (around line #17):
14: <% @books.each do |book| %>
15:
16: <%= link_to book.title, :action => “show”, :id => book.id
%>
17: <%= book.author.last_name %>
18:
19: <% end %>
20:
but as far as I can tell I have done the right things in the
controllers, models and views:
author_controller.rb:
@authors = Author.find :all,
:order => 'last_name, first_name'
book_controller.rb:
@books = Book.find :all,
:order => 'title, back'
author.rb:
has_many :books
book.rb:
belongs_to :author
book/list.rhtml:
<% @books.each do |book| %>
<% end %>Book |
Author |
| <%= link_to book.title, :action => "show", :id => book.id %> | <%= book.author.last_name %> |
authors table:
id | integer | not null default
nextval(‘public.authors_id_seq’::text)
last_name | character varying(20) |
first_name | character varying(20) |
other_name | character varying(20) |
books table:
id | integer | not null default
nextval(‘public.books_id_seq’::text)
media | character(2) | not null
title | character varying(50) | not null
year | integer | not null
cat | character(1) | not null
back | character(1) |
own | character(1) |
author_id | integer
I have been battling with this for ages but can’t see any bugs left -
any suggestions?
Thanks,
Phil.
–
Philip R.
Pricom Pty Limited (ACN 003 252 275 ABN 91 003 252 275)
GPO Box 3411
Sydney NSW 2001
Australia
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