Ruby Forum Rails Engines > can not update my data base using "update_attributes"

Hello,

I have this problem that my rails application works fine in development
environment on my local Linux and windows system but when I uploaded it
to work on the server in production environment I have this problem  as
listed in the pasted log file at the end of this entry:
NoMethodError (undefined method `[]' for nil:NilClass):
   /app/controllers/admin_controller.rb:201:in `update'

the support team could not crack this one. I would think that the method
"update_attributes" would just work. if I enter a new entry to the data
base "mysql" it works fine and also the sort works fine in updating the
data base.
I have attached the controller file. all the functions work except for
the update one and only when it is running on the hosting server under
production environment.


I do not understand why it says in the log file nilclass when the return
@params is not nil.


Hope someone can help me on this one.

****************************************
********* controller *******************
****************************************


def update
 if session[:project_cat].nil? then
  redirect_to :action => 'index'
 else
  @category    = Parent.find_by_cat_name(session[:project_cat])
  if @category.cat_name == "branding" then
   @project  = @category.brandings.find(params[:id])
  elsif @category.cat_name == "client_say" then
   @project  = @category.client_says.find(params[:id])
  else
   @project  = @category.projects.find(params[:id])
  end

  if @project.update_attributes(@params[:project]) # this is line 201
   flash[:notice] = 'Project was successfully updated.'
   redirect_to :action => 'show', :id => @project, :cat_name =>
@category.id
  else
   render :action => 'edit', :cat_name => @category.id
  end
 end
end

****************************************
***** log file *************************
****************************************

Processing AdminController#update (for 81.3.100.245 at 2008-02-07
05:22:08) [POST]
 Session ID:
BAh7CjoWcHJvamVjdF9pbWFnZV91cmx7ADoQcHJvamVjdF9jYXQiCW1pc2M6%0ACXVzZXJpBzoOcmV0dXJuX3RvMCIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxl%0Acjo6Rmxhc2g6OkZsYXNoSGFzaHsABjoKQHVzZWR7AA%3D%3D--be44b352117c1f931fe6eb0eab2a7f0b99ab8edd
 Parameters: {"commit"=>"Save", "cat_name"=>"3",
"project"=>{"tags"=>"flash private", "client"=>"Mom & Dad",
"description"=>"A movie clip for my parent's 35 anniversary",
"url_link"=>""}, "action"=>"update", "id"=>"25", "controller"=>"admin"}


NoMethodError (undefined method `[]' for nil:NilClass):
   /app/controllers/admin_controller.rb:201:in `update'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:1158:in
`send'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:1158:in
`perform_action_without_filters'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/filters.rb:697:in
`call_filters'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/filters.rb:689:in
`perform_action_without_benchmark'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:68:in
`perform_action_without_rescue'
   /usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:68:in
`perform_action_without_rescue'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/rescue.rb:199:in
`perform_action_without_caching'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/caching.rb:678:in
`perform_action'
   /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/abstract/query_cache.rb:33:in
`cache'
   /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/query_cache.rb:8:in
`cache'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/caching.rb:677:in
`perform_action'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:524:in
`send'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:524:in
`process_without_filters'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/filters.rb:685:in
`process_without_session_management_support'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/session_management.rb:123:in
`process'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:388:in
`process'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:171:in
`handle_request'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:115:in
`dispatch'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:126:in
`dispatch_cgi'
   /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:9:in
`dispatch'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel/rails.rb:76:in
`process'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel/rails.rb:74:in
`synchronize'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel/rails.rb:74:in
`process'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel.rb:159:in
`process_client'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel.rb:158:in
`each'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel.rb:158:in
`process_client'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel.rb:285:in
`run'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel.rb:285:in
`initialize'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel.rb:285:in
`new'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel.rb:285:in
`run'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel.rb:268:in
`initialize'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel.rb:268:in
`new'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel.rb:268:in
`run'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel/configurator.rb:282:in
`run'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel/configurator.rb:281:in
`each'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel/configurator.rb:281:in
`run'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/mongrel_rails:128:in
`run'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/../lib/mongrel/command.rb:212:in
`run'
   /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.3/bin/mongrel_rails:281

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