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Hunter Hillegas

2007-Aug-16 22:56 UTC

When Could AR Objects Not Have Their Methods?

I''m seeing something strange and so far haven''t been able to
figure
it out. First off, here''s our setup:

MacOS X Tiger 10.4.10 (Intel)
Ruby 1.8.6
Rails 1.2.3
PostgreSQL 8.2.3

I have a ton of apps that work great but a brand new app is giving me  
trouble.

I am getting an error indicating that the ''errors'' method for
the
object doesn''t exist. It should be inherited from the base AR class.

This app has a single model, ''Upload'' that uses attachment_fu
to take
uploads.

Here''s my code:

Model:

class Upload < ActiveRecord::Base
   has_attachment :storage => :file_system, :max_size => 5.megabytes
end

Controller:

def new
   @upload = Upload.new if @upload.blank?
end

View:

<% form_for :upload, @upload, :url => {:action => :create} do |form|
%>
   <% if @upload != nil && !@upload.errors.empty? -%>
     <%= error_messages_for ''upload'' %>
   <% end -%>
<% end %>

The error I get is:

ActionView::TemplateError (undefined method `errors'' for #<Upload: 
0x34e5e14>) on line #12 of app/views/uploads/new.rhtml:

12:             <% if @upload != nil && !@upload.errors.empty? -%>
14:                     <%= error_messages_for ''upload''
%>
15:             <% end -%>

     #{RAILS_ROOT}/app/views/uploads/new.rhtml:12:in  
`_run_rhtml_47app47views47uploads47new46rhtml''
     /opt/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ 
action_view/helpers/form_helper.rb:151:in `fields_for''
     /opt/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/ 
action_view/helpers/form_helper.rb:127:in `form_for''
     #{RAILS_ROOT}/app/views/uploads/new.rhtml:4:in  
`_run_rhtml_47app47views47uploads47new46rhtml''

Huh?

When I put in some debugging code, it gets even more interesting:

I added this code to the controller:

     logger.debug "Upload Class: #{@upload.class}"
     logger.debug @upload.methods

Ok, this should tell me more. Output:

Upload Class: Upload

inspectinstance_execlistenerclonemethodrequire_gemrequire_library_or_gem 
request_progresspublic_methodsencode64blank? 
listener=instance_variable_defined?decode64equal? 
freezeunloadableloadb64encodemethodssilence_warningsrespond_to? 
enable_warningsreturningremove_subclasses_ofdupto_yamlinstance_variables 
optionsdecode_b__id__object_ideql? 
requireidprocesssilence_streamrequest_beginssingleton_methodsto_yaml_sty 
lesendwith_optionstaintfrozen?instance_variable_getgeminstance_of? 
__send__to_aextend_with_included_modules_fromrequest_notify`typeinstance 
_evalprotected_methodsto_yaml_propertiesdisplay=====subclasses_ofinstanc 
e_variable_setsilence_stderrextended_byextendkind_of? 
to_sdaemonizeinstance_valuesclasshashto_paramprivate_methods=~tainted? 
suppresstagurito_jsonuntaintnil? 
copy_instance_variables_fromtaguri=dcloneis_a?

So, it is the right class but the methods are wrong.

What the heck is going on here? When I create a new Upload object  
from the console, everything works properly and the methods are all  
there.

What gives?

Thanks,
Hunter


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Keynan Pratt

2007-Aug-16 23:04 UTC

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Re: When Could AR Objects Not Have Their Methods?

>    @upload = Upload.new if @upload.blank?
the if statement is the most likely cause
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Keynan Pratt

2007-Aug-16 23:06 UTC

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Re: When Could AR Objects Not Have Their Methods?

> the if statement is the most likely cause
it should always return false or throw an error if @upload is undefined.
I assume this is for if new is called from edit/update were @upload is 
already defined.

try "unless @upload" instead



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dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org

2007-Aug-16 23:34 UTC

head link

Re: When Could AR Objects Not Have Their Methods?

Hi --

On Thu, 16 Aug 2007, Hunter Hillegas wrote:
>
> I''m seeing something strange and so far haven''t been able
to figure
> it out. First off, here''s our setup:
>
> MacOS X Tiger 10.4.10 (Intel)
> Ruby 1.8.6
> Rails 1.2.3
> PostgreSQL 8.2.3
>
> I have a ton of apps that work great but a brand new app is giving me
> trouble.
>
> I am getting an error indicating that the ''errors'' method
for the
> object doesn''t exist. It should be inherited from the base AR
class.
>
> This app has a single model, ''Upload'' that uses
attachment_fu to take
> uploads.
>
> Here''s my code:
>
> Model:
>
> class Upload < ActiveRecord::Base
>   has_attachment :storage => :file_system, :max_size => 5.megabytes
> end
>
> Controller:
>
> def new
>   @upload = Upload.new if @upload.blank?
> end
>
> View:
>
> <% form_for :upload, @upload, :url => {:action => :create} do
|form| %>
>   <% if @upload != nil && !@upload.errors.empty? -%>
>     <%= error_messages_for ''upload'' %>
>   <% end -%>
> <% end %>
>
> The error I get is:
>
> ActionView::TemplateError (undefined method `errors'' for
#<Upload:
> 0x34e5e14>) on line #12 of app/views/uploads/new.rhtml:
>
> 12:             <% if @upload != nil && !@upload.errors.empty?
-%>
> 14:                     <%= error_messages_for
''upload'' %>
> 15:             <% end -%>
There''s no line 13. Are you superstitious? :-)

I don''t know what the problem is, but I''m curious what would
happen if
you simply removed the surrounding lines and just had line 14.
error_messages_for is smart enough not to bother showing anything if
there''s nothing to show.


David

-- 
* Books:
   RAILS ROUTING (new! http://www.awprofessional.com/title/0321509242)
   RUBY FOR RAILS (http://www.manning.com/black)
* Ruby/Rails training
     & consulting:  Ruby Power and Light, LLC (http://www.rubypal.com)

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Hunter Hillegas

2007-Aug-17 00:05 UTC

head link

Re: When Could AR Objects Not Have Their Methods?

Thanks for responding.

I tried changing it to:

@upload = Upload.new unless @upload

but I''m getting the same error.

In the view, I removed the conditional around the error messages  
helper output and that didn''t help either.

It''s strange - it''s like this instance of the
''Upload'' class isn''t
properly hooking up with AR - it''s not getting all of the inherited  
methods... But when used in the console it works fine.

This project has nothing in it but the ''attachment_fu'' plugin.
Can
anyone think of any other code that would be loaded here that could  
somehow screw up the class loading?

On Aug 16, 2007, at 4:06 PM, Keynan Pratt wrote:
>
>> the if statement is the most likely cause
>
> it should always return false or throw an error if @upload is  
> undefined.
> I assume this is for if new is called from edit/update were @upload is
> already defined.
>
> try "unless @upload" instead
>

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dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org

2007-Aug-17 00:13 UTC

head link

Re: When Could AR Objects Not Have Their Methods?

Hi --

On Thu, 16 Aug 2007, Hunter Hillegas wrote:
>
> Thanks for responding.
>
> I tried changing it to:
>
> @upload = Upload.new unless @upload
>
> but I''m getting the same error.
>
> In the view, I removed the conditional around the error messages
> helper output and that didn''t help either.
>
> It''s strange - it''s like this instance of the
''Upload'' class isn''t
> properly hooking up with AR - it''s not getting all of the
inherited
> methods... But when used in the console it works fine.
>
> This project has nothing in it but the ''attachment_fu''
plugin. Can
> anyone think of any other code that would be loaded here that could
> somehow screw up the class loading?
You might try changing the name of Upload to Blah or something, just
to see if it''s a namespace thing, though I don''t think
attachment_fu
defines an Upload class. And I assume you''ve checked and
double-checked that Upload is inheriting from AR::Base -- that would
be the other issue.


David

-- 
* Books:
   RAILS ROUTING (new! http://www.awprofessional.com/title/0321509242)
   RUBY FOR RAILS (http://www.manning.com/black)
* Ruby/Rails training
     & consulting:  Ruby Power and Light, LLC (http://www.rubypal.com)

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Hunter Hillegas

2007-Aug-17 00:22 UTC

head link

Re: When Could AR Objects Not Have Their Methods?

I was just thinking that so I tried it...

Using another class name does seem to work, though I can''t find  
''Upload'' in any reserved word list of mentioned at all in
attachment_fu.

For this one I''ll probably not worry about it and name it something  
else but I''m surprised I hit this issue as I did check before hand.

On Aug 16, 2007, at 5:13 PM, dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org
wrote:
> You might try changing the name of Upload to Blah or something, just
> to see if it''s a namespace thing, though I don''t think
attachment_fu
> defines an Upload class. And I assume you''ve checked and
> double-checked that Upload is inheriting from AR::Base -- that would
> be the other issue.
>

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Rails - Aug 2007 - When Could AR Objects Not Have Their Methods?

When Could AR Objects Not Have Their Methods?

Re: When Could AR Objects Not Have Their Methods?

Re: When Could AR Objects Not Have Their Methods?

Re: When Could AR Objects Not Have Their Methods?

Re: When Could AR Objects Not Have Their Methods?

Re: When Could AR Objects Not Have Their Methods?

Re: When Could AR Objects Not Have Their Methods?