ActiveRecord inheritance

prhlava · August 15, 2006, 2:20pm

Hello,
I got the following issue and I do not know how to resolve it:
#1. created parent class (AccountExtended) for some my models
(lib/classes_lib.rb):
class AccountExtended < ActiveRecord::Base
def self.findByAccount
end
end

#2. created model Country:
require ‘lib/classes_lib’
class Country < AccountExtended
end

#3. and added a test controller what shows an issue
(view_controller.rb):
class ViewController < ApplicationController
def index
@countries = Country.find(:all)
end
end

index.rhtml:

<% @countries.each do |c| -%> <% end -%>

<%= c.full_name %>

(it is simply a skeleton)

then I start webrick, refresh page in my browser and see countries list.
After second refresh a browser’s page I get:

NameError in ViewController#index

uninitialized constant AccountExtended

|RAILS_ROOT: script/…/config/…|

Application Trace http://localhost:3000/view# | Framework Trace
http://localhost:3000/view# | Full Trace http://localhost:3000/view#

|/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:123:in const_missing' /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in const_missing’
#{RAILS_ROOT}/app/models/country.rb:2
app/controllers/view_controller.rb:3:in `index’|

|/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:123:in const_missing' /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in const_missing’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:140:in
load' /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:56:in require_or_load’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:30:in
depend_on' /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:85:in require_dependency’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:98:in
const_missing' /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in const_missing’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:133:in
const_missing' /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in perform_action_without_filters’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in
perform_action_without_benchmark' /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in perform_action_without_rescue’
/usr/local/lib/ruby/1.8/benchmark.rb:293:in measure' /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in perform_action_without_rescue’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in
perform_action' /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in process_without_filters’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in
process_without_session_management_support' /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in process’
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in
dispatch' /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in handle_dispatch’
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81: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-1.1.6/lib/webrick_server.rb:67:in dispatch’
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/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-1.3.1/lib/active_support/dependencies.rb:147:in require’
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in require’
script/server:3|

|/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:123:in const_missing' /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in const_missing’
#{RAILS_ROOT}/app/models/country.rb:2
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:140:in
load' /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:56:in require_or_load’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:30:in
depend_on' /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:85:in require_dependency’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:98:in
const_missing' /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in const_missing’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:133:in
const_missing' app/controllers/view_controller.rb:3:in index’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in
perform_action_without_filters' /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in perform_action_without_benchmark’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
perform_action_without_rescue' /usr/local/lib/ruby/1.8/benchmark.rb:293:in measure’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
perform_action_without_rescue' /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in perform_action’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in
process_without_filters' /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in process_without_session_management_support’
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in
process' /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in dispatch’
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in
handle_dispatch' /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81: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-1.1.6/lib/webrick_server.rb:67:in
dispatch' /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/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-1.3.1/lib/active_support/dependencies.rb:147:in
require' /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in require’
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require’
script/server:3|

|This error occured while loading the following files:
country.rb
account_extended.rb

|

Please, can anybody explain me what I do wrongly ?
Thanks.

prhlava · August 15, 2006, 2:20pm

just put your AR model in /app/models. at least that works for me (i
didn’t
try it otherwise, though)

2006/8/15, Vladimir K. [email protected]:

#2. created model Country:

After second refresh a browser’s page I get:
http://localhost:3000/view# | Full Trace http://localhost:3000/view#
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in
const_missing' /usr/local/lib/ruby/1.8/benchmark.rb:293:in measure’
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in
/usr/local/lib/ruby/1.8/webrick/server.rb:92:in start' /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30 #{RAILS_ROOT}/app/models/country.rb:2 /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:131:in /usr/local/lib/ruby/1.8/benchmark.rb:293:in measure’
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in
/usr/local/lib/ruby/1.8/webrick/server.rb:92:in `start’
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30
|

Rails mailing list
[email protected]
http://lists.rubyonrails.org/mailman/listinfo/rails

–
Michael S. [email protected]

www.stellar-legends.de - Weltraum-Browsergame im Alpha-Stadium

prhlava · August 15, 2006, 2:21pm

Vladimir K. wrote:

Michael S. wrote:

just put your AR model in /app/models. at least that works for me (i
didn’t try it otherwise, though)

I have moved classes_lib.rb to /app/models, modified ‘require’ and got
the same error message

I have renamed classes_lib.rb -> app/models/account_extended.rb and now
it is working
but it is very strangely…

prhlava · August 15, 2006, 2:20pm

Michael S. wrote:

just put your AR model in /app/models. at least that works for me (i
didn’t try it otherwise, though)

I have moved classes_lib.rb to /app/models, modified ‘require’ and got
the same error message

prhlava · August 16, 2006, 8:01am

Michael S. wrote:

now i know what went wrong…
rails makes some assupmtions about class- and filenames. one is: a
file in models camelized => model classname. so if the autoloader
encounters a unknown classname (=constant), it knows in which file it
finds that class. if it isnt there or has another name, it fails.
but when request is processed at the first time all is right: rails
loads necessary library (require ‘classes_lib’) and returns a correct
response.
interestingly, why at the second time loading is not working: may be it
decided library had been already loaded but constant (class name) is not
defined and it tries to load library with default name (based on
constant/class name) ?

prhlava · August 15, 2006, 2:21pm

now i know what went wrong…
rails makes some assupmtions about class- and filenames. one is: a file
in
models camelized => model classname. so if the autoloader encounters a
unknown classname (=constant), it knows in which file it finds that
class.
if it isnt there or has another name, it fails.

2006/8/15, Vladimir K. [email protected]:

the same error message

Hello,
class Country < AccountExtended
index.rhtml:
After second refresh a browser's page I get:
<http://localhost:3000/view#>> | Framework Trace
--

Vladimir K.

–
Michael S. [email protected]

www.stellar-legends.de - Weltraum-Browsergame im Alpha-Stadium

ActiveRecord inheritance

then I start webrick, refresh page in my browser and see countries list. After second refresh a browser’s page I get:

|This error occured while loading the following files: country.rb account_extended.rb

then I start webrick, refresh page in my browser and see countries list.
After second refresh a browser’s page I get:

|This error occured while loading the following files:
country.rb
account_extended.rb