N00b request help with scaffold- undefined method 'body=' error

ruby-talk
1

Hey guys,

I'm trying to work my way through the Ruby on Rails tutorial building CRUD actions using scaffold based on a single database table.

the "list" action seems to work well, but all other actions result in errors.

See trace below ..

I am only 2 hours into my Ruby (rails) experience and I have no idea how to track down this bug.

Here's the top part of my ResponseController code:

class ResponsesController < ApplicationController
   def index
     list
     render :action => 'list'
   end

   def list
     @response_pages, @responses = paginate :responses, :per_page => 10
   end

   def show
     @response = Response.find(params[:id])
   end

   def new
     @response = Response.new
   end

Any help appreciated!

Thanks!

undefined method `body=' for #<Response:0xb756fed8>

RAILS_ROOT: script/../config/..
Application Trace | Framework Trace | Full Trace

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/base.rb:1498:in `method_missing'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:694:in `erase_render_results'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:712:in `erase_results'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/rescue.rb:28:in `rescue_action'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/rescue.rb:108:in `perform_action'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:369:in `process_without_session_management_support'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/session_management.rb:116:in `process'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/dispatcher.rb:38:in `dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:117:in `handle_dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:83:in `service'
/usr/local/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/local/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/local/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/usr/local/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/usr/local/lib/ruby/1.8/webrick/server.rb:95:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:92:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:23:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:82:in `start'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:69:in `dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/servers/webrick.rb:59
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in `require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in `require'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/server.rb:28
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in `require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in `require'

2

If I had this error, I'd guess that I don't have the attribute "body"
in my "responses" table. Though, I don't know the particulars of your
setup, so it could be many things.

However, please note that scaffolding is not the preferred way to learn
Rails. And, secondly, there is a rails dedicated group that is probably
a better place for rails questions.

But, anyhow, goodluck with it!

-hampton.

3

the "list" action seems to work well, but all other actions result in
errors.

class ResponsesController < ApplicationController
   def index
     list
     render :action => 'list'
   end

   def list
     @response_pages, @responses = paginate :responses, :per_page => 10
   end

   def show
     @response = Response.find(params[:id])
   end

   def new
     @response = Response.new
   end

Hi,

My guess is that "response" is something special in Rails (so is "request"
if I remember correctly). You are probably overwriting a Rails instance
variable... Try renaming @response to something else. It might even be your
"Response" model that's confusing Rails: maybe there is a Response class in
Rails. Try renaming it to something else...

I hope this will help...

Guillaume

4

Shouldn't you also be inheriting from ActionController and not ApplicationController? Have a look at the ActionController class (http://rubyonrails.org/api/classes/ActionController/Base.html\). I've always thought that ApplicationController was a top-level abstract?

Thanks,

Jeff
(Oh, hi! I don't post much, but I enjoy reading what everyone else does =)

···

On Feb 26, 2006, at 11:21 AM, Guillaume Benny wrote:

the "list" action seems to work well, but all other actions result in
errors.

class ResponsesController < ApplicationController
   def index
     list
     render :action => 'list'
   end

   def list
     @response_pages, @responses = paginate :responses, :per_page => 10
   end

   def show
     @response = Response.find(params[:id])
   end

   def new
     @response = Response.new
   end

Hi,

My guess is that "response" is something special in Rails (so is "request"
if I remember correctly). You are probably overwriting a Rails instance
variable... Try renaming @response to something else. It might even be your
"Response" model that's confusing Rails: maybe there is a Response class in
Rails. Try renaming it to something else...

I hope this will help...

Guillaume

5

Thanks, Guillaume.

This was the problem. I renamed my controller and things started working as they were designed.

Thankyou,
na

Guillaume Benny wrote:

···

the "list" action seems to work well, but all other actions result in
errors.

class ResponsesController < ApplicationController
  def index
    list
    render :action => 'list'
  end

  def list
    @response_pages, @responses = paginate :responses, :per_page => 10
  end

  def show
    @response = Response.find(params[:id])
  end

  def new
    @response = Response.new
  end

Hi,

My guess is that "response" is something special in Rails (so is "request"
if I remember correctly). You are probably overwriting a Rails instance
variable... Try renaming @response to something else. It might even be your
"Response" model that's confusing Rails: maybe there is a Response class in
Rails. Try renaming it to something else...

I hope this will help...

Guillaume