关于ruby on rails：TypeError(无法将nil转换为Integer)：

TypeError (can't convert nil into Integer):

我在Rails 3中开发了一个插件，该插件用于管理模型的文档存储库。在任何模型中，您都可以附加任意数量的具有特定名称的文档。喜欢。

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class Person < ActiveRecord::Base
attach_documents_as :job_documents
attach_documents_as :personal_documents
end

效果很好。我知道它看起来很愚蠢，但是今天我开始了我的项目，发现它死了。无法弄清楚为什么会发生。尝试了很多，但没有运气。"新建"和"更新"表单显示得很好，但是无论何时我们创建或更新它，都会产生错误。

出现严重错误：

1	TypeError (can't convert nil into Integer):

我尝试调试它，但是在进入控制器的create或update方法之前，它会生成错误。

，完整的错误日志为：

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Error during failsafe response: ActionView::Template::Error
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in `method_missing'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_dispatch/http/parameters.rb:10:in `parameters'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb:3:in `__home_likewise_open____________nazar_hussain__rvm_gems_ruby_______p__gems_actionpack_______lib_action_dispatch_middleware_templates_rescues_diagnostics_erb__205668074_102092250__741834326'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_view/template.rb:135:in `block in render'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_support/notifications.rb:54:in `instrument'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_view/template.rb:127:in `render'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_view/render/rendering.rb:59:in `block in _render_template'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_support/notifications.rb:52:in `block in instrument'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_support/notifications.rb:52:in `instrument'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_view/render/rendering.rb:56:in `_render_template'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_view/render/rendering.rb:26:in `render'
nazar.hussain/osd/development/atlantis/vendor/plugins/active_scaffold/lib/extensions/action_view_rendering.rb:86:in `render_with_active_scaffold'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:88:in `rescue_action_locally'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:68:in `render_exception'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:59:in `rescue in call'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_dispatch/middleware/show_exceptions.rb:46:in `call'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/rack/logger.rb:13:in `call'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/runtime.rb:17:in `call'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/lock.rb:11:in `block in call'
<internal:prelude>:10:in `synchronize'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/lock.rb:11:in `call'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/actionpack-3.0.3/lib/action_dispatch/middleware/static.rb:30:in `call'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/application.rb:168:in `call'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/application.rb:77:in `method_missing'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/rack/log_tailer.rb:14:in `call'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/content_length.rb:13:in `call'
nazar.hussain/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/handler/webrick.rb:52:in `service'
nazar.hussain/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
nazar.hussain/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
nazar.hussain/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

希望有人会看到这个问题。我会很感激。

根据要求，我正在发布代码：

控制器是简单的支架：带有额外的一行。
@testing.build_documents在创建和编辑中

这是型号

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class Testing < ActiveRecord::Base

attach_documents_as :xdocs, :XdocsDocType

end

这是插件代码

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module AttachDocumentsAs
module Attacher

def attach_documents_as(*attachment_as)
@as = nil
@type_model = 'AttachDocumentsAs::Models::AttachedDocumentsDefaultType'

attachment_as = attachment_as.to_a.flatten.compact.map(&:to_sym)
@as = attachment_as.first

if attachment_as.size > 1
@type_model = attachment_as.second
end

class_inheritable_reader(@as)

class_inheritable_reader(:atd_as)
write_inheritable_attribute(:atd_as, @as)

class_inheritable_reader(:atd_as_type)
write_inheritable_attribute(:atd_as_type, @type_model)

if @type_model.to_s.camelize.constantize.is_a?(Class)
class_eval do
has_many @as, :as => :attachable, :class_name=>"AttachDocumentsAs::Models::AttachedDocument"
accepts_nested_attributes_for @as

include AttachDocumentsAs::Attacher::Core
end
end

rescue NameError
puts"Model with name #{"#{@as}DocType".camelize.constantize} does not exits"
end

end
end

module AttachDocumentsAs
module Attacher
module Core

def self.included(base)
base.send :include, AttachDocumentsAs::Attacher::Core::InstanceMethods
base.extend AttachDocumentsAs::Attacher::Core::ClassMethods
end

module InstanceMethods
def build_documents(count=1)
1.upto count do
self.send(self.send(:atd_as)).build
end
docs = self.send(self.send(:atd_as))
0.upto (count-1) do |i|
docs[i].typeable = self.send(:atd_as_type).to_s.camelize.constantize.new
end
end
end

module ClassMethods
end
end
end
end

最后是表格

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<%= simple_form_for(@testing, :html => {:multipart => true}) do |f| %>
<%= f.error_notification %>

<%= f.input :title %>

<%= f.simple_fields_for :xdocs do |x| %>
<% if x.object.new_record? %>

<%= x.input :attachment, :as=>:file %>
<%= x.input :title, :as=>:string %>
<%= x.input :description, :as=>:text %>
<%= x.input :type, :as=>:attachment_type %>

<% end %>
<% end %>

<%= f.button :submit %>

<% end %>