Rails - Aug 2006 - AWDWR Chpt6: Webrick Get...200... then ...500...

Hi, Rails produces to diff Gets on the Webrick:
AWDWR Chpt 6 strange results:

First browser call to /Admin shows correct form; - And WEBrick reports:

"Get /admin HTTP/1.1" 200 485  - -> /admin

Subsequent browser calls to /Admin show:
NoMethodError in AdminController#index
undefined method `each'' for #<Mysql:0x37aba80>

- And WEBrick reports:

"Get /admin HTTP/1.1" 500 10767  - -> /admin


First browser call to /Admin/new shows correct form for editing; - And 
WEBrick reports:

"Get /admin/new HTTP/1.1" 200 10767   - -> /admin/new

Subsequent browswer calls to /Admin/new show:
NoMethodError in AdminController#new
undefined method `each'' for #<Mysql:0x376d7e8>
RAILS_ROOT: ./script/../config/..

- And WEBrick reports:

"Get /admin/new HTTP/1.1" 500 9798  - -> /admin/new

So the first calls produce a "Get...200..." and the right browser 
results.
Subsequent calls produce a "Get...500..." and
"NoMethodError"

Thanks for your help,
Joe

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My AdminController class:

def index
list
render :action => ''list''
end

def new
@product = Product.new
end

My routes.rb:
map.connect '':controller/service.wsdl'', :action =>
''wsdl''
map.connect '':controller/:action/:id''


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