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Paul Hackmann

2006-Jan-12 23:39 UTC

[Rails] uninitialized constant error

Hi Everyone,

  I''m a newbie to Rails, and I just finished going through the cookbook
tutorial.  I''m now trying to build my own application, and I''m
trying to
add more inputs to the edit view to modify data in other tables.  Below 
is the controller code where I am having trouble.  PartsLocation is 
another table (like Part) in the database, and that is the line where I 
get the error.

class PartController < ApplicationController
	scaffold :part

	def list
		@parts = Part.find_all
	end

	def edit
		@part = Part.find(@params["id"])
		@partslocation = PartsLocation.find(@params["partnumber"])
	end
end

Below is the error I am seeing related to the PartsLocation table, but I 
have no idea why PartsLocation is uninitialized, but Part is 
initialized.  Any help is appreciated!

Thanks,
Paul

NameError in Part#edit

uninitialized constant PartsLocation

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

C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:200:in
`const_missing''
#{RAILS_ROOT}/app/controllers/part_controller.rb:10:in `edit''

C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:200:in
`const_missing''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:853:in
`perform_action_without_filters''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/filters.rb:332:in
`perform_action_without_benchmark''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/rescue.rb:82:in
`perform_action''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:369:in
`process_without_session_management_support''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/session_management.rb:116:in
`process''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/dispatcher.rb:38:in
`dispatch''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:117:in
`handle_dispatch''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:83:in
`service''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in 
`service''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in 
`run''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:173:in 
`start_thread''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:162:in 
`start_thread''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:95:in
`start''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:92:in
`start''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:23:in
`start''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:82:in
`start''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:69:in
`dispatch''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/servers/webrick.rb:59
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
`require''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in
`require''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/server.rb:28
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
`require''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in
`require''
script/server:3

C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:200:in
`const_missing''
#{RAILS_ROOT}/app/controllers/part_controller.rb:10:in `edit''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:853:in
`perform_action_without_filters''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/filters.rb:332:in
`perform_action_without_benchmark''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/rescue.rb:82:in
`perform_action''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:369:in
`process_without_session_management_support''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/session_management.rb:116:in
`process''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/dispatcher.rb:38:in
`dispatch''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:117:in
`handle_dispatch''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:83:in
`service''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in 
`service''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in 
`run''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:173:in 
`start_thread''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:162:in 
`start_thread''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:95:in
`start''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:92:in
`start''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:23:in
`start''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/1.8/webrick/server.rb:82:in
`start''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:69:in
`dispatch''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/servers/webrick.rb:59
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
`require''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in
`require''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/server.rb:28
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
`require''
C:/RUBYON~1/INSTAN~1.0/ruby/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in
`require''
script/server:3

This error occured while loading the following files:
   parts_location.rb

Request

Parameters: {"id"=>"1"}

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

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

Kevin Olbrich

2006-Jan-12 23:56 UTC

head link

[Rails] Re: uninitialized constant error

> 
> class PartController < ApplicationController
> 	scaffold :part
> 
> 	def list
> 		@parts = Part.find_all
> 	end
> 
> 	def edit
> 		@part = Part.find(@params["id"])
> 		@partslocation = PartsLocation.find(@params["partnumber"])
> 	end
> end
my guess is you are looking for something like this...

class PartController < ApplicationController
  scaffold :part

  def list...

  def edit
    @part = Part.find(params["id"])
    @partslocation = 
PartLocations.find_by_partnumber(params["partnumber")
  end
end

The error you are getting is because it cannot find the
''parts_location''
model. Probably you either have it defined in ''part_locations''
or
''partslocation''.

Your second search will fail unless "partnumber" is the primary key
for
that table.

_Kevin

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

Lori Olson

2006-Jan-13 02:09 UTC

head link

[Rails] uninitialized constant error

On Jan 12, 2006, at 4:39 PM, Paul Hackmann wrote:
> Hi Everyone,
>
>   I''m a newbie to Rails, and I just finished going through the  
> cookbook
> tutorial.  I''m now trying to build my own application, and
I''m
> trying to
> add more inputs to the edit view to modify data in other tables.   
> Below
> is the controller code where I am having trouble.  PartsLocation is
> another table (like Part) in the database, and that is the line  
> where I
> get the error.
>
> class PartController < ApplicationController
> 	scaffold :part
>
> 	def list
> 		@parts = Part.find_all
> 	end
>
> 	def edit
> 		@part = Part.find(@params["id"])
> 		@partslocation = PartsLocation.find(@params["partnumber"])
> 	end
> end
>
Scaffolding is great, but if you are going to step beyond the bounds  
of the basics, then you have to get in there and get your hands  
dirty.  The error is caused by the lack of:

model :parts_location

But if you are using 2 models, you need to specify them both, like

model :part, :parts_location

In either case, you''ll need to ditch the scaffold, and do it for real  
now.

Paul Hackmann

2006-Jan-14 16:53 UTC

head link

[Rails] Re: uninitialized constant error

I tried both Kevin and Lori''s suggestions, but neither seemed to help
at
all.  I think part of my problem is that it is looking for a 
parts_location.rb file, and my model file is partslocation.rb.  Why is 
it putting the underscore in there?

As far as ditching the scaffolding goes, I was hoping to replace it a 
bit at a time by removing list, then edit, etc.  I know it will 
eventually be gone.

Thanks,
Paul

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

Joe Van Dyk

2006-Jan-14 16:58 UTC

head link

[Rails] Re: uninitialized constant error

On 1/14/06, Paul Hackmann <shackman@alpinecom.net>
wrote:> I tried both Kevin and Lori''s suggestions, but neither seemed to
help at
> all.  I think part of my problem is that it is looking for a
> parts_location.rb file, and my model file is partslocation.rb.  Why is
> it putting the underscore in there?
>
> As far as ditching the scaffolding goes, I was hoping to replace it a
> bit at a time by removing list, then edit, etc.  I know it will
> eventually be gone.
Your model should be part_location.rb.  Didn''t you create your model
via
$ script/generate model PartLocation?

Paul Hackmann

2006-Jan-14 17:07 UTC

head link

[Rails] Re: Re: uninitialized constant error

Joe Van Dyk wrote:> On 1/14/06, Paul Hackmann <shackman@alpinecom.net> wrote:
>> I tried both Kevin and Lori''s suggestions, but neither seemed
to help at
>> all.  I think part of my problem is that it is looking for a
>> parts_location.rb file, and my model file is partslocation.rb.  Why is
>> it putting the underscore in there?
>>
>> As far as ditching the scaffolding goes, I was hoping to replace it a
>> bit at a time by removing list, then edit, etc.  I know it will
>> eventually be gone.
> 
> Your model should be part_location.rb.  Didn''t you create your
model via
> $ script/generate model PartLocation?
I believe I did:

ruby script\generate model partslocation

Paul

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

Joe Van Dyk

2006-Jan-14 17:57 UTC

head link

[Rails] Re: Re: uninitialized constant error

On 1/14/06, Paul Hackmann <shackman@alpinecom.net>
wrote:> Joe Van Dyk wrote:
> > On 1/14/06, Paul Hackmann <shackman@alpinecom.net> wrote:
> >> I tried both Kevin and Lori''s suggestions, but neither
seemed to help at
> >> all.  I think part of my problem is that it is looking for a
> >> parts_location.rb file, and my model file is partslocation.rb. 
Why is
> >> it putting the underscore in there?
> >>
> >> As far as ditching the scaffolding goes, I was hoping to replace
it a
> >> bit at a time by removing list, then edit, etc.  I know it will
> >> eventually be gone.
> >
> > Your model should be part_location.rb.  Didn''t you create
your model via
> > $ script/generate model PartLocation?
>
> I believe I did:
>
> ruby script\generate model partslocation
Should''ve used script/generate model parts_location (or
PartsLocation).  That''s what the controller expects to find.

Joe Van Dyk

2006-Jan-14 17:59 UTC

head link

[Rails] Re: Re: uninitialized constant error

On 1/14/06, Joe Van Dyk <joevandyk@gmail.com>
wrote:> On 1/14/06, Paul Hackmann <shackman@alpinecom.net> wrote:
> > Joe Van Dyk wrote:
> > > On 1/14/06, Paul Hackmann <shackman@alpinecom.net> wrote:
> > >> I tried both Kevin and Lori''s suggestions, but
neither seemed to help at
> > >> all.  I think part of my problem is that it is looking for a
> > >> parts_location.rb file, and my model file is
partslocation.rb.  Why is
> > >> it putting the underscore in there?
> > >>
> > >> As far as ditching the scaffolding goes, I was hoping to
replace it a
> > >> bit at a time by removing list, then edit, etc.  I know it
will
> > >> eventually be gone.
> > >
> > > Your model should be part_location.rb.  Didn''t you
create your model via
> > > $ script/generate model PartLocation?
> >
> > I believe I did:
> >
> > ruby script\generate model partslocation
>
> Should''ve used script/generate model parts_location (or
> PartsLocation).  That''s what the controller expects to find.
In any event, I bet your model is called Partslocation, right?  Your
controller is looking for PartsLocation.

Paul Hackmann

2006-Jan-14 19:07 UTC

head link

[Rails] Re: Re: Re: uninitialized constant error

Joe Van Dyk wrote:> On 1/14/06, Joe Van Dyk <joevandyk@gmail.com> wrote:
>> > >> eventually be gone.
>> > >
>> > > Your model should be part_location.rb.  Didn''t you
create your model via
>> > > $ script/generate model PartLocation?
>> >
>> > I believe I did:
>> >
>> > ruby script\generate model partslocation
>>
>> Should''ve used script/generate model parts_location (or
>> PartsLocation).  That''s what the controller expects to find.
> 
> In any event, I bet your model is called Partslocation, right?  Your
> controller is looking for PartsLocation.
Now I feel like an idiot. All that I needed was a lowercase L in 
Partslocation.   It worked just fine after I changed it.   Nevertheless, 
thanks for the help everyone.

Thanks,
Paul

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

Tony Hillerson

2006-Jan-19 07:15 UTC

head link

[Rails] uninitialized constant error

I have a single table inheritance model for some classes
Payment < ActiveRecord::Base
CreditCardPayment < Payment
ECheckPayment < Payment
ManualPayment < Payment

they all get persisted to the payments table

I''m getting an error: ''uninitialized constant
Payment'' when trying to
create a new instance of any of these classes. At one point in my 
process I store the payment in a session variable, but I''ve it seems 
random as to when this happens: before or after that gets set. I even 
tried explicitly requiring the payment class in the sub classes, and 
still get the error.

I''m using Webrick on ruby 1.8.3 installed on cygwin on a Windows XP 
machine.

Any ideas what''s going on? As I''m sure we all are,
I''m under a time
crunch, and this is an unexpected error. Please help!

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

Alex Young

2006-Jan-19 09:12 UTC

head link

[Rails] uninitialized constant error

Tony Hillerson wrote:> I have a single table inheritance model for some classes
> Payment < ActiveRecord::Base
> CreditCardPayment < Payment
> ECheckPayment < Payment
> ManualPayment < Payment
> 
> they all get persisted to the payments tableDo you have a ''type'' column in the payments table?  I presume
you do,
but it''s always best to check...
> I''m using Webrick on ruby 1.8.3 installed on cygwin on a Windows
XP
> machine.That could be a source of problems:  the Rails site specifically 
recommends against 1.8.3.

I''d ditch cygwin ruby and use the one-click installer if I were you, 
just to get rid of the question mark.  It''s working fine for me.

-- 
Alex

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