AWS api_method :returns not accepting ActiveRecord::Base


#1

I’m trying to use the feature of AWS where it will take an object
derived
from ActiveRecord::Base instead of an AWS::Struct object. Whenever I
try
it, though, I get the craziest error:

NoMethodError: You have a nil object when you didn’t expect it!
The error occured while evaluating nil.new
/usr/lib/…/actionwebservice/lib/action_web_service/casting.rb:105:in
`cast_to_structured_type’
[…]

The reason why there’s a nil object instead of a type class object is
because something tried to create a StructuredType of Exception, which
(strangely!) doesn’t actually work.

Changing my type to any of the internals or to a class derived from
AWS::Struct causes the problem to disappear.

I know I’m a bit short on details, but the full test case is fairly
simple
to construct – create an ActiveRecord model, create a basic AWS API,
and
try to make the API method return the model. If it’s unclear, I’ll whip
up
a sample example to demonstrate the problem as I see it, but it probably
won’t be of a form suitable for inclusion in the test suite, so it’s
probably better if people who know about such things build the
acceptance
test.

  • Matt

#2

Has anyone found a solution to this? I’m running into the same problem.

Matthew P. wrote:

I’m trying to use the feature of AWS where it will take an object
derived
from ActiveRecord::Base instead of an AWS::Struct object. Whenever I
try
it, though, I get the craziest error:

NoMethodError: You have a nil object when you didn’t expect it!
The error occured while evaluating nil.new
/usr/lib/…/actionwebservice/lib/action_web_service/casting.rb:105:in


#3

Are you using the latest version?

On 5/12/06, Chris G. removed_email_address@domain.invalid wrote:

The error occured while evaluating nil.new
/usr/lib/…/actionwebservice/lib/action_web_service/casting.rb:105:in


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


Rails mailing list
removed_email_address@domain.invalid
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Kent

http://www.datanoise.com


#4

Chris,

Can you post a code that triggers this exception? It seems that for some
reason your model class is not registered with soup4r mapping.


#5

I’m running Rails 1.1.2. AWS = 1.1.2. Ruby 1.8.4. The actual error
I’m getting appears to be thrown when ActiveRecord is looking up the
table definition information after the SOAP call has been made. Here’s
the stacktrace:

NoMethodError (You have a nil object when you didn’t expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.[]=):
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1889:in
write_attribute' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1380:inid=’
c:/ruby/lib/ruby/1.8/soap/mapping/mapping.rb:298:in set_attributes' c:/ruby/lib/ruby/1.8/soap/mapping/mapping.rb:294:inset_attributes’
c:/ruby/lib/ruby/1.8/soap/mapping/factory.rb:75:in setiv2struct' c:/ruby/lib/ruby/1.8/soap/mapping/factory.rb:35:insetiv2obj’
c:/ruby/lib/ruby/1.8/soap/mapping/rubytypeFactory.rb:442:in
unknownstruct2obj' c:/ruby/lib/ruby/1.8/soap/mapping/rubytypeFactory.rb:405:inunknowntype2obj’
c:/ruby/lib/ruby/1.8/soap/mapping/rubytypeFactory.rb:251:in
soap2obj' c:/ruby/lib/ruby/1.8/soap/mapping/registry.rb:479:in_soap2obj’
c:/ruby/lib/ruby/1.8/soap/mapping/registry.rb:428:in soap2obj' c:/ruby/lib/ruby/1.8/soap/mapping/mapping.rb:146:in_soap2obj’
c:/ruby/lib/ruby/1.8/soap/mapping/mapping.rb:143:in _soap2obj' c:/ruby/lib/ruby/1.8/soap/mapping/mapping.rb:59:insoap2obj’
c:/ruby/lib/ruby/1.8/soap/mapping/mapping.rb:360:in
protect_threadvars' c:/ruby/lib/ruby/1.8/soap/mapping/mapping.rb:55:insoap2obj’
c:/ruby/lib/ruby/gems/1.8/gems/actionwebservice-1.1.2/lib/action_web_service/protocol/soap_protocol/marshaler.rb:31:in
soap_to_ruby' c:/ruby/lib/ruby/gems/1.8/gems/actionwebservice-1.1.2/lib/action_web_service/protocol/soap_protocol.rb:61:indecode_request’
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in
collect' c:/ruby/lib/ruby/1.8/soap/baseData.rb:475:ineach’
c:/ruby/lib/ruby/gems/1.8/gems/actionwebservice-1.1.2/lib/action_web_service/protocol/soap_protocol.rb:61:in
decode_request' c:/ruby/lib/ruby/gems/1.8/gems/actionwebservice-1.1.2/lib/action_web_service/protocol/soap_protocol.rb:45:indecode_action_pack_request’
c:/ruby/lib/ruby/gems/1.8/gems/actionwebservice-1.1.2/lib/action_web_service/protocol/discovery.rb:20:in
discover_web_service_request' c:/ruby/lib/ruby/gems/1.8/gems/actionwebservice-1.1.2/lib/action_web_service/protocol/discovery.rb:18:indiscover_web_service_request’
c:/ruby/lib/ruby/gems/1.8/gems/actionwebservice-1.1.2/lib/action_web_service/dispatcher/action_controller_dispatcher.rb:44:in
dispatch_web_service_request' (eval):1:inapi’
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:inperform_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/1.8/benchmark.rb:293:inmeasure’
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:inperform_action’
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:inprocess_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:indispatch’
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:inservice’
c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in service' c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:inrun’
c:/ruby/lib/ruby/1.8/webrick/server.rb:173:in start_thread' c:/ruby/lib/ruby/1.8/webrick/server.rb:162:instart_thread’
c:/ruby/lib/ruby/1.8/webrick/server.rb:95:in start' c:/ruby/lib/ruby/1.8/webrick/server.rb:92:instart’
c:/ruby/lib/ruby/1.8/webrick/server.rb:23:in start' c:/ruby/lib/ruby/1.8/webrick/server.rb:82:instart’
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:21:inrequire’
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:21:inrequire’
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require’
script/server:3

Kent S. wrote:

Are you using the latest version?

On 5/12/06, Chris G. removed_email_address@domain.invalid wrote:

The error occured while evaluating nil.new
/usr/lib/…/actionwebservice/lib/action_web_service/casting.rb:105:in


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


Rails mailing list
removed_email_address@domain.invalid
http://lists.rubyonrails.org/mailman/listinfo/rails


Kent

http://www.datanoise.com


#6

Sure. Note that the code is blowing up before the first line of
update_test(company) is executed…the logger statement in the first
line never gets logged, which suggest that it’s in the marshalling code.
The find_by_id method works and returns the object to the calling code,
so it seems to only be a problem with the calling code is sending an
ActiveRecord object.

Also, I tracked down the line in ActiveRecord/base.rb (line 1892) that
is causing the error, and apparently @attributes is equal to
nil…which is a problem. It looks like something in the marshalling
process is supposed to create an instance of @attributes and it’s not
happening.

The application that calls the service is a C# application. The
back-end database is SQL Server, and all of this is running on Windows
XP with ruby 1.82.

Thanks for the help.

ServiceController:

class CompanyServiceController < ApplicationController
class_inheritable_option :allow_active_record_expects, true
wsdl_service_name ‘CompanyService’
def find_by_id(id)
Company.find(:all, :conditions => [‘id = ?’, id])
end

def update_test(company)
logger.info(“test: this line is never displayed”)
@company = Company.find(company.id)
@company.update_attributes(company)
end
end

API definition:

class CompanyServiceApi < ActionWebService::API::Base
class_inheritable_option :allow_active_record_expects, true
api_method :find_by_id, :expects => [:int], :returns => [[Company]]
api_method :update_test, :expects => [Company]
end

Model definition:

class Company < ActiveRecord::Base
set_table_name “tCompany”
belongs_to :enterprise
end

Kent S. wrote:

Chris,

Can you post a code that triggers this exception? It seems that for some
reason your model class is not registered with soup4r mapping.