# Uninitialized constant error after scaffold on new Windows X

**URL:** <https://www.ruby-forum.com/t/uninitialized-constant-error-after-scaffold-on-new-windows-x/63395>\
**Category:** Rails\
**Created:** [June 14, 2006, 9:45pm UTC](https://www.ruby-forum.com/t/uninitialized-constant-error-after-scaffold-on-new-windows-x/63395 "2006-06-14T21:45:56Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Bill\_EdstromS\_Jr](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/848f3c/32.png) [@Bill\_EdstromS\_Jr](https://www.ruby-forum.com/u/Bill_EdstromS_Jr)\
**Post date:** [June 14, 2006, 9:45pm UTC](https://www.ruby-forum.com/t/uninitialized-constant-error-after-scaffold-on-new-windows-x/63395/1 "2006-06-14T21:45:56Z")

</div>

I am attempting to get a working Rails programming environment setup  
working  
under XP with MySQL, RadRails and Webrick. I have been using my  
PowerBook  
but need to working on Windows environment too.

I have basic functions of Ruby and Rails going. I created a really  
simple  
table and generated the scaffolding. The server starts just fine. I can  
browse the database succesfully in RadRails. The issue is this error  
when I  
attempt to run the program.

I have been looking at this for several hours now and am running out of  
ideas.

(1) Do you recognize this error and have any suggestions. I am running a  
completely vanilla scaffold.

(2) My MySQL table has just two colums one is an interger and one is a  
medium text field. Are there some MySQL datatypes that are not  
compatible  
with Rails?

Thanks!

====================================

uninitialized constant Slip

RAILS\_ROOT: ./script/…/config/…  
Application Trace [http://localhost:3000/admin#](http://localhost:3000/admin#) | Framework  
Trace[http://localhost:3000/admin#](http://localhost:3000/admin#)| Full  
Trace [http://localhost:3000/admin#](http://localhost:3000/admin#)

c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/dependencies.rb:123:in  
`const_missing' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in `const\_missing’  
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/inflector.rb:161:in  
`module_eval' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/inflector.rb:161:in `module\_eval’  
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/inflector.rb:161:in  
`constantize' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/core_ext/string/inflections.rb:59:in `constantize’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/pagination.rb:194:in  
`paginator_and_collection_for' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/pagination.rb:129:in `paginate’  
#{RAILS\_ROOT}/app/controllers/admin\_controller.rb:12:in `list' #{RAILS_ROOT}/app/controllers/admin_controller.rb:3:in `index’  
-e:4:in `load’  
-e:4

c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/dependencies.rb:123:in  
`const_missing' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in `const\_missing’  
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/inflector.rb:161:in  
`module_eval' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/inflector.rb:161:in `module\_eval’  
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/inflector.rb:161:in  
`constantize' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/core_ext/string/inflections.rb:59:in `constantize’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/pagination.rb:194:in  
`paginator_and_collection_for' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/pagination.rb:129:in `paginate’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/base.rb:910:in  
`send' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:910:in `perform\_action\_without\_filters’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/filters.rb:368:in  
`perform_action_without_benchmark' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:in `perform\_action\_without\_rescue’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/benchmarking.rb:69:in  
`measure' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:in `perform\_action\_without\_rescue’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/rescue.rb:82:in  
`perform_action' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:381:in `send’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/base.rb:381:in  
`process_without_filters' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:377:in `process\_without\_session\_management\_support’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/session\_management.rb:117:in  
`process' c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/dispatcher.rb:38:in `dispatch’  
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick\_server.rb:115:in  
`handle_dispatch' c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:81:in `service’  
c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service' c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run’  
c:/ruby/lib/ruby/1.8/webrick/server.rb:155:in `start_thread' c:/ruby/lib/ruby/1.8/webrick/server.rb:144:in `start’  
c:/ruby/lib/ruby/1.8/webrick/server.rb:144:in `start_thread' c:/ruby/lib/ruby/1.8/webrick/server.rb:94:in `start’  
c:/ruby/lib/ruby/1.8/webrick/server.rb:89:in `each' c:/ruby/lib/ruby/1.8/webrick/server.rb:89:in `start’  
c:/ruby/lib/ruby/1.8/webrick/server.rb:79:in `start' c:/ruby/lib/ruby/1.8/webrick/server.rb:79:in `start’  
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick\_server.rb:67:in  
`dispatch' c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/servers/webrick.rb:59 c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:18:in `require\_\_’  
c:/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:18:in  
`require' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require’  
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/server.rb:30  
c:/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:18:in  
`require__' c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:18:in `require’  
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/dependencies.rb:147:in  
`require’  
script/server:3

c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/dependencies.rb:123:in  
`const_missing' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in `const\_missing’  
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/inflector.rb:161:in  
`module_eval' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/inflector.rb:161:in `module\_eval’  
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/inflector.rb:161:in  
`constantize' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/core_ext/string/inflections.rb:59:in `constantize’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/pagination.rb:194:in  
`paginator_and_collection_for' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/pagination.rb:129:in `paginate’  
#{RAILS\_ROOT}/app/controllers/admin\_controller.rb:12:in `list' #{RAILS_ROOT}/app/controllers/admin_controller.rb:3:in `index’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/base.rb:910:in  
`send' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:910:in `perform\_action\_without\_filters’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/filters.rb:368:in  
`perform_action_without_benchmark' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:in `perform\_action\_without\_rescue’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/benchmarking.rb:69:in  
`measure' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/benchmarking.rb:69:in `perform\_action\_without\_rescue’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/rescue.rb:82:in  
`perform_action' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/base.rb:381:in `send’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/base.rb:381:in  
`process_without_filters' c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller/filters.rb:377:in `process\_without\_session\_management\_support’  
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action\_controller/session\_management.rb:117:in  
`process' c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/dispatcher.rb:38:in `dispatch’  
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick\_server.rb:115:in  
`handle_dispatch' c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick_server.rb:81:in `service’  
c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service' c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run’  
c:/ruby/lib/ruby/1.8/webrick/server.rb:155:in `start_thread' c:/ruby/lib/ruby/1.8/webrick/server.rb:144:in `start’  
c:/ruby/lib/ruby/1.8/webrick/server.rb:144:in `start_thread' c:/ruby/lib/ruby/1.8/webrick/server.rb:94:in `start’  
c:/ruby/lib/ruby/1.8/webrick/server.rb:89:in `each' c:/ruby/lib/ruby/1.8/webrick/server.rb:89:in `start’  
c:/ruby/lib/ruby/1.8/webrick/server.rb:79:in `start' c:/ruby/lib/ruby/1.8/webrick/server.rb:79:in `start’  
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/webrick\_server.rb:67:in  
`dispatch' c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/servers/webrick.rb:59 c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:18:in `require\_\_’  
c:/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:18:in  
`require' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require’  
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.2/lib/commands/server.rb:30  
c:/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:18:in  
`require__' c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:18:in `require’  
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/dependencies.rb:147:in  
`require' script/server:3 -e:4:in `load’  
-e:4

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

---

<div class="post-metadata">

**Author:** ![Bill\_EdstromS\_Jr](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/848f3c/32.png) [@Bill\_EdstromS\_Jr](https://www.ruby-forum.com/u/Bill_EdstromS_Jr)\
**Post date:** [June 14, 2006, 10:00pm UTC](https://www.ruby-forum.com/t/uninitialized-constant-error-after-scaffold-on-new-windows-x/63395/2 "2006-06-14T22:00:04Z")

</div>

When you see that message, it usually means your model couldn’t be  
loaded  
due to syntax problems or something of that nature.

Notice the message at the end of the stack trace…

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

Have a look in your model for any syntax issues. If you’re stuck, paste  
the  
code and I’m sure someone can help. This doesn’t _seem_ like a Windows  
issue  
to me.

---

<div class="post-metadata">

**Author:** ![Bill\_EdstromS\_Jr](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/848f3c/32.png) [@Bill\_EdstromS\_Jr](https://www.ruby-forum.com/u/Bill_EdstromS_Jr)\
**Post date:** [June 14, 2006, 10:13pm UTC](https://www.ruby-forum.com/t/uninitialized-constant-error-after-scaffold-on-new-windows-x/63395/3 "2006-06-14T22:13:30Z")

</div>

> When you see that message, it usually means your model couldn’t be loaded  
> due to syntax problems or something of that nature.

Thanks for the quick response. Is the something wrong with naming the  
model  
“Slips”

My model is simply scaffold code:

class Slips \< ActiveRecord::Base  
end

The controller is scaffold as well:

class AdminController \< ApplicationController  
def index  
list  
render :action =\> ‘list’  
end

# GETs should be safe (see

[URIs, Addressability, and the use of HTTP GET and POST](http://www.w3.org/2001/tag/doc/whenToUseGet.html))  
verify :method =\> :post, :only =\> [:destroy, :create, :update],  
:redirect\_to =\> { :action =\> :list }

def list  
@slips\_pages, @slips = paginate :slips, :per\_page =\> 10  
end

def show  
@slips = Slips.find(params[:id])  
end

def new  
@slips = Slips.new  
end

def create  
@slips = Slips.new(params[:slips])  
if @slips.save  
flash[:notice] = ‘Slips was successfully created.’  
redirect\_to :action =\> ‘list’  
else  
render :action =\> ‘new’  
end  
end

def edit  
@slips = Slips.find(params[:id])  
end

def update  
@slips = Slips.find(params[:id])  
if @slips.update\_attributes(params[:slips])  
flash[:notice] = ‘Slips was successfully updated.’  
redirect\_to :action =\> ‘show’, :id =\> @slips  
else  
render :action =\> ‘edit’  
end  
end

def destroy  
Slips.find(params[:id]).destroy  
redirect\_to :action =\> ‘list’  
end  
end

---

<div class="post-metadata">

**Author:** ![Bill\_EdstromS\_Jr](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/848f3c/32.png) [@Bill\_EdstromS\_Jr](https://www.ruby-forum.com/u/Bill_EdstromS_Jr)\
**Post date:** [June 14, 2006, 11:26pm UTC](https://www.ruby-forum.com/t/uninitialized-constant-error-after-scaffold-on-new-windows-x/63395/4 "2006-06-14T23:26:43Z")

</div>

> > Thanks for the quick response. Is the something wrong with naming the  
> > model  
> > “Slips”
> 
> Kind of 🙂
> 
> Rails convention is singular classname and plural tablename. The DB  
> table would be called ‘slips’, the model class should be called Slip.

Very basic mistake on my part!

Thank you so much, this solved my problem, I am Rolling on Windows!

---

<div class="post-metadata">

**Author:** ![Bill\_EdstromS\_Jr](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/848f3c/32.png) [@Bill\_EdstromS\_Jr](https://www.ruby-forum.com/u/Bill_EdstromS_Jr)\
**Post date:** [June 14, 2006, 10:28pm UTC](https://www.ruby-forum.com/t/uninitialized-constant-error-after-scaffold-on-new-windows-x/63395/5 "2006-06-14T22:28:28Z")

</div>

Bill Edstrom, Jr. wrote:

> > When you see that message, it usually means your model couldn’t be loaded  
> > due to syntax problems or something of that nature.
> 
> Thanks for the quick response. Is the something wrong with naming the  
> model  
> “Slips”

Kind of 🙂

Rails convention is singular classname and plural tablename. The DB  
table would be called ‘slips’, the model class should be called Slip.

Alan

---

<div class="post-metadata">

**Author:** ![Bill\_EdstromS\_Jr](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/848f3c/32.png) [@Bill\_EdstromS\_Jr](https://www.ruby-forum.com/u/Bill_EdstromS_Jr)\
**Post date:** [June 15, 2006, 5:52am UTC](https://www.ruby-forum.com/t/uninitialized-constant-error-after-scaffold-on-new-windows-x/63395/6 "2006-06-15T05:52:18Z")

</div>

Bill Edstrom, Jr. wrote:

> Is the something wrong with naming the model “Slips”

Yes.

One of the fundamental RoR conventions is that table names are plurals  
of  
the model names. That’s because, in the AR pattern, models are an  
instance  
(singular) of a collection of objects (plural) that are stored in  
tables.  
So if you have a ‘slip’ object (model) it will be stored in a table  
named  
‘slips’. Convention over configuration. Makes sense, no?

hth,  
Bill