gistfile1.rb

class Document
  include Mongoid::Document
  field :query_subject, :type => String
  field :content, :type => String
  
  class << self
    
    def find_current (query_subject)
      self.where(:query_subject => query_subject).order_by(:created_at.desc).first
    end
    
  end
  
end


# Why would this throws the following exception?

jruby-1.6.0 :025 > Document.find_current('alkjdf')           
Mongoid::Errors::InvalidCollection: Access to the collection for Document is not allowed since it is an embedded document, please access a collection from the root document.
	from /Users/mark/.rvm/gems/jruby-1.6.0@we_build_pages/gems/mongoid-2.0.0.rc.7/lib/mongoid/collections.rb:21:in `collection'
	from /Users/mark/.rvm/gems/jruby-1.6.0@we_build_pages/gems/mongoid-2.0.0.rc.7/lib/mongoid/contexts/mongo.rb:255:in `one'
	from org/jruby/RubyKernel.java:2038:in `send'
	from /Users/mark/.rvm/gems/jruby-1.6.0@we_build_pages/gems/mongoid-2.0.0.rc.7/lib/mongoid/criteria.rb:36:in `first'
	from /Users/mark/projects/we_build_pages/app/models/document.rb:9:in `find_current'
	from (irb):25:in `evaluate'
	from org/jruby/RubyKernel.java:1087:in `eval'
	from /Users/mark/.rvm/rubies/jruby-1.6.0/lib/ruby/1.8/irb.rb:158:in `eval_input'
	from /Users/mark/.rvm/rubies/jruby-1.6.0/lib/ruby/1.8/irb.rb:271:in `signal_status'
	from /Users/mark/.rvm/rubies/jruby-1.6.0/lib/ruby/1.8/irb.rb:155:in `eval_input'
	from org/jruby/RubyKernel.java:1417:in `loop'
	from org/jruby/RubyKernel.java:1190:in `catch'
	from /Users/mark/.rvm/rubies/jruby-1.6.0/lib/ruby/1.8/irb.rb:154:in `eval_input'
	from /Users/mark/.rvm/rubies/jruby-1.6.0/lib/ruby/1.8/irb.rb:71:in `start'
	from org/jruby/RubyKernel.java:1190:in `catch'
	from /Users/mark/.rvm/rubies/jruby-1.6.0/lib/ruby/1.8/irb.rb:70:in `start'
	from /Users/mark/.rvm/gems/jruby-1.6.0@we_build_pages/gems/railties-3.0.3/lib/rails/commands/console.rb:44:in `start'
	from /Users/mark/.rvm/gems/jruby-1.6.0@we_build_pages/gems/railties-3.0.3/lib/rails/commands/console.rb:8:in `start'
	from /Users/mark/.rvm/gems/jruby-1.6.0@we_build_pages/gems/railties-3.0.3/lib/rails/commands.rb:23:in `(root)'
	from org/jruby/RubyKernel.java:1037:in `require'
	from script/rails:6:in `(root)'jruby-1.6.0 :026 > 

jruby-1.6.0 :035 > Document.new.embedded_many?
 => nil 
jruby-1.6.0 :036 > Document.new.embedded_one? 
 => nil 
jruby-1.6.0 :037 > Document.new.embedded?     
 => true 
jruby-1.6.0 :038 >