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Brian R. Robinson

2006-Aug-13 02:25 UTC

[Rails] Newbie question: scaffold not working

I went through a tutorial at 
http://www.onlamp.com/pub/a/onlamp/2005/01/20/rails.html?page=1 to get 
started with RoR.  I really like the idea of the scaffold construct, but 
I can''t seem to get it to work the way it was described in the
tutorial.
I''ve got a mysql database that is properly configured, and a table 
called ''quotes'' with a column called
''quote'', and an auto incrementing
primary key of ''id''.  Below is my controller code and model,
and the
error I get.  Anyone have any idea why this doesn''t just work?  Btw, 
I''ve got Ruby 1.8.4 (2006-04-14) [i386-mswin32], and I can''t
figure out
what version of Rails (or even RubyGems...I used this last night to 
install Rails).

In app/controllers:
class QuoteController < ApplicationController
	scaffold :quote
end

In app/models:
class Quote < ActiveRecord::Base
end


Here is the error I got:

 ArgumentError in Quote#index

Showing 
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/templates/scaffolds/list.rhtml
where line #13 raised:

wrong number of arguments (0 for 1)

Extracted source (around line #13):

10: <% for entry in
instance_variable_get("@#{@scaffold_plural_name}")
%>
11:   <tr>
12:   <% for column in @scaffold_class.content_columns %>
13:     <td><%= entry.send(column.name) %></td>
14:   <% end %>
15:     <td><%= link_to "Show", :action =>
"show#{@scaffold_suffix}",
:id => entry %></td>
16:     <td><%= link_to "Edit", :action =>
"edit#{@scaffold_suffix}",
:id => entry %></td>

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

c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/templates/scaffolds/list.rhtml:13:in
`quote''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/templates/scaffolds/list.rhtml:13:in
`_run_rhtml_c__dev_ruby_lib_ruby_gems_1468_gems_actionpack_14612465_lib_action_controller_templates_scaffolds_list''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/templates/scaffolds/list.rhtml:12:in
`_run_rhtml_c__dev_ruby_lib_ruby_gems_1468_gems_actionpack_14612465_lib_action_controller_templates_scaffolds_list''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/templates/scaffolds/list.rhtml:10:in
`_run_rhtml_c__dev_ruby_lib_ruby_gems_1468_gems_actionpack_14612465_lib_action_controller_templates_scaffolds_list''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_view/base.rb:316:in
`compile_and_render_template''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_view/base.rb:292:in
`render_template''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_view/base.rb:251:in
`render_file''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/scaffolding.rb:168:in
`render_scaffold''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/scaffolding.rb:110:in
`list''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/scaffolding.rb:97:in
`index''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in
`perform_action_without_filters''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in
`perform_action_without_benchmark''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
c:/dev/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in
`perform_action''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in
`process_without_filters''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in
`process_without_session_management_support''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in
`process''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in 
`dispatch''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in 
`handle_dispatch''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in 
`service''
c:/dev/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
c:/dev/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in 
`dispatch''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/servers/webrick.rb:59
c:/dev/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
c:/dev/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30
c:/dev/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
c:/dev/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
script/server:3

c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/templates/scaffolds/list.rhtml:13:in
`quote''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/templates/scaffolds/list.rhtml:13:in
`_run_rhtml_c__dev_ruby_lib_ruby_gems_1468_gems_actionpack_14612465_lib_action_controller_templates_scaffolds_list''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/templates/scaffolds/list.rhtml:12:in
`_run_rhtml_c__dev_ruby_lib_ruby_gems_1468_gems_actionpack_14612465_lib_action_controller_templates_scaffolds_list''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/templates/scaffolds/list.rhtml:10:in
`_run_rhtml_c__dev_ruby_lib_ruby_gems_1468_gems_actionpack_14612465_lib_action_controller_templates_scaffolds_list''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_view/base.rb:316:in
`compile_and_render_template''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_view/base.rb:292:in
`render_template''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_view/base.rb:251:in
`render_file''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/scaffolding.rb:168:in
`render_scaffold''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/scaffolding.rb:110:in
`list''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/scaffolding.rb:97:in
`index''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in
`perform_action_without_filters''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in
`perform_action_without_benchmark''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
c:/dev/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in
`perform_action''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in
`process_without_filters''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in
`process_without_session_management_support''
c:/dev/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in
`process''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in 
`dispatch''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in 
`handle_dispatch''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in 
`service''
c:/dev/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
c:/dev/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start''
c:/dev/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in 
`dispatch''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/servers/webrick.rb:59
c:/dev/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
c:/dev/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
c:/dev/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30
c:/dev/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
c:/dev/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
script/server:3

Request

Parameters: None

Show session dump

---
flash: !map:ActionController::Flash::FlashHash {}


Response
Headers: {"cookie"=>[],
"Cache-Control"=>"no-cache"}

-- 
Posted via http://www.ruby-forum.com/.

harper

2006-Aug-13 12:32 UTC

head link

[Rails] Re: Newbie question: scaffold not working

> wrong number of arguments (0 for 1)
> 10: <% for entry in
instance_variable_get("@#{@scaffold_plural_name}").
.
.> 12:   <% for column in @scaffold_class.content_columns %>
-------------> 13:     <td><%= entry.send(column.name) %></td>-------------


The error message is stating that you put in a wrong number of arguments 
(you aren''t passing any variables at all, where you should be passing 
one) in a certain function you were calling - - on line 13 - - 
something.SEND(1 varaiable here).

meaning, column.name  doesn''t populate anything at all.
one reason i could come up with is that the statment in line 12 (for 
column in ...) doesn''t populate anything either (hence, the variable 
column is incorrect/nil) and that''s why you are getting your error.

i would check to see why @scaffold_class.content_columns isn''t 
working...how did the process of scaffolding go? did you do it before 
creating the columns in the table? afterwords?

anyhow, good luck, and welcome to ror.

harp

-- 
Posted via http://www.ruby-forum.com/.

Brian R. Robinson

2006-Aug-13 13:31 UTC

head link

[Rails] Re: Newbie question: scaffold not working

So I tried a few different things, and it turns out that the scaffold 
capability was choking because of the fact that I had a column name that 
was the singular form of the table.  So the table was ''quotes''
and it
had a column named ''quote''.  When I changed the
''quote'' column to be
called ''text'' instead, the scaffold worked just fine.

This seems like a bug to me...where would I report it?

harper wrote:>> wrong number of arguments (0 for 1)
>> 10: <% for entry in
instance_variable_get("@#{@scaffold_plural_name}")
> .
> .
> .
>> 12:   <% for column in @scaffold_class.content_columns %>
> 
> -------------
>> 13:     <td><%= entry.send(column.name) %></td>
> -------------
> 
> 
> The error message is stating that you put in a wrong number of arguments 
> (you aren''t passing any variables at all, where you should be
passing
> one) in a certain function you were calling - - on line 13 - - 
> something.SEND(1 varaiable here).
> 
> meaning, column.name  doesn''t populate anything at all.
> one reason i could come up with is that the statment in line 12 (for 
> column in ...) doesn''t populate anything either (hence, the
variable
> column is incorrect/nil) and that''s why you are getting your
error.
> 
> i would check to see why @scaffold_class.content_columns isn''t 
> working...how did the process of scaffolding go? did you do it before 
> creating the columns in the table? afterwords?
> 
> anyhow, good luck, and welcome to ror.
> 
> harp

-- 
Posted via http://www.ruby-forum.com/.

James Schementi

2006-Aug-13 20:39 UTC

head link

[Rails] Re: Newbie question: scaffold not working

Brian R. Robinson wrote:> So I tried a few different things, and it turns out that the scaffold 
> capability was choking because of the fact that I had a column name that 
> was the singular form of the table.  So the table was
''quotes'' and it
> had a column named ''quote''.  When I changed the
''quote'' column to be
> called ''text'' instead, the scaffold worked just fine.
You''re sure it was the column name that was causing the problems? I
just
whipped the same type of app; a controller that scaffolded on :comment, 
where I had a ''comments'' table with a column called
''comment'', and a
model called ''Comment'', and everything worked fine.


db/schema.rb:
create_table :comments do |t|
  t.column :name, :string
  t.column :comment, :text
  t.column :user_id, :integer
end

controllers/comment_controller.rb
class CommentController < ApplicationController
  scaffold :comment
end

models/comment.rb
class Comment < ActiveRecord::Base
end

-- 
Posted via http://www.ruby-forum.com/.

James Schementi

2006-Aug-13 20:40 UTC

head link

[Rails] Re: Newbie question: scaffold not working

Brian R. Robinson wrote:> I can''t figure out 
> what version of Rails (or even RubyGems...I used this last night to 
> install Rails).
type ''rails --version" or "gem --version" at the
console/command prompt
to see what the version is of the respected apps.

-- 
Posted via http://www.ruby-forum.com/.

Curt Hibbs

2006-Nov-04 02:55 UTC

head link

[Rails] Re: Newbie question: scaffold not working

On 8/13/06, Brian R. Robinson <brian@robinsontechnology.com>
wrote:> So I tried a few different things, and it turns out that the scaffold
> capability was choking because of the fact that I had a column name that
> was the singular form of the table.  So the table was
''quotes'' and it
> had a column named ''quote''.  When I changed the
''quote'' column to be
> called ''text'' instead, the scaffold worked just fine.
>
> This seems like a bug to me...where would I report it?
It might be that, it might also just be that you can''t use
"quote". I
know from experience that you can''t have a column named
"value"
because it conflicts with an SQL keyword of the same name. I''m not SQL
expert, but perhaps "quote" falls into the same category.

Curt

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