Greetings,

Thank you for producing Mongoid! I love it!

I am attempting to save a series of objects (with mongoized,demonogize, evolve) into an Array. I get an error "undefined method `bson_dump'" which is at the bottom of the document. I have reproduced the issue using the Point example from the custom fields demo.

Thank you!

-daniel

test.rb

    require 'mongoid'

    Mongoid.load!("mongoid.yml", :test)

    # this is the point example taken from the documentation
    class Point
      attr_reader :x, :y

      def initialize(x, y)
        @x, @y= x, y
      end

      # Converts an object of this instance into a database friendly value.
      def mongoize
        [ x, y ]
      end

      class << self

        # Get the object as it was stored in the database, and instantiate
        # this custom class from it.
        def demongoize(object)
          Point.new(object[0], object[1])
        end

        # Takes any possible object and converts it to how it would be
        # stored in the database.
        def mongoize(object)
          case object
          when Point then object.mongoize
          when Hash then Point.new(object[:x], object[:y]).mongoize
          else object
          end
        end

        # Converts the object that was supplied to a criteria and converts it
        # into a database friendly form.
        def evolve(object)
          case object
          when Point then object.mongoize
          else object
          end
        end
      end
    end

    # saving a class as a single field works fine
    class Single
      include Mongoid::Document
      field :location, :type => Point
    end

    s = Single.new 
    s.location = Point.new(1, 2)
    s.save

    # when saving the an array of objects, there is the error given
    class Plural
      include Mongoid::Document
      field :locations, :type => Array, :default => []
    end  

    p = Plural.new
    p.locations << Point.new(1, 2)
    p.locations << Point.new(3, 4)
    p.save

mongoid.yml

    test: 
      sessions: 
        default: 
          hosts: 
            - localhost:27017
          database: point_array
      options: 
        allow_dynamic_fields: false
        identity_map_enabled: true
        include_root_in_json: true
        include_type_for_serialization: true
        scope_overwrite_exception: true
        raise_not_found_error: false
        skip_version_check: false
        use_activesupport_time_zone: false
        use_utc: true

error

/var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/bson/extensions/array.rb:14:in {{bson_dump': undefined method }}bson_dump' for #<Point:0x000000027c22a0 @x=1, @y=2> (NoMethodError)
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/bson/extensions/hash.rb:15:in `block in bson_dump'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/bson/extensions/hash.rb:14:in `each'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/bson/extensions/hash.rb:14:in `bson_dump'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/bson/document.rb:36:in `serialize'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/protocol/message.rb:129:in `block in serialize_documents'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/protocol/message.rb:128:in `each'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/protocol/message.rb:128:in `serialize_documents'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/protocol/message.rb:287:in `serialize'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/connection.rb:153:in `block in write'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/connection.rb:151:in `each'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/connection.rb:151:in `write'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/node.rb:578:in `block (2 levels) in flush'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/node.rb:138:in `ensure_connected'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/node.rb:577:in `block in flush'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/node.rb:592:in `logging'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/node.rb:576:in `flush'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/node.rb:565:in `process'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/node.rb:253:in `insert'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/session/context.rb:63:in `block in insert'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/session/context.rb:109:in `block in with_node'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/cluster.rb:209:in `block in with_primary'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/node.rb:183:in `ensure_primary'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/cluster.rb:208:in `with_primary'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/session/context.rb:108:in `with_node'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/session/context.rb:56:in `insert'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/collection.rb:106:in `block in insert'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/session.rb:324:in `with'
from /var/lib/gems/1.9.1/gems/moped-1.4.5/lib/moped/collection.rb:105:in `insert'
from /var/lib/gems/1.9.1/gems/mongoid-3.1.3/lib/mongoid/persistence/operations/insert.rb:27:in `block in persist'
from /var/lib/gems/1.9.1/gems/mongoid-3.1.3/lib/mongoid/persistence/insertion.rb:25:in `block (2 levels) in prepare'
from /var/lib/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:403:in `_run*4468728994625756828*create*237314211246586726*callbacks'
from /var/lib/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:405:in `__run_callback'
from /var/lib/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:385:in `_run_create_callbacks'
from /var/lib/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:81:in `run_callbacks'
from /var/lib/gems/1.9.1/gems/mongoid-3.1.3/lib/mongoid/callbacks.rb:130:in `run_callbacks'
from /var/lib/gems/1.9.1/gems/mongoid-3.1.3/lib/mongoid/persistence/insertion.rb:24:in `block in prepare'
from /var/lib/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:403:in `_run*4468728994625756828*save*237314211246586726*callbacks'
from /var/lib/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:405:in `__run_callback'
from /var/lib/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:385:in `_run_save_callbacks'
from /var/lib/gems/1.9.1/gems/activesupport-3.2.11/lib/active_support/callbacks.rb:81:in `run_callbacks'
from /var/lib/gems/1.9.1/gems/mongoid-3.1.3/lib/mongoid/callbacks.rb:130:in `run_callbacks'
from /var/lib/gems/1.9.1/gems/mongoid-3.1.3/lib/mongoid/persistence/insertion.rb:23:in `prepare'
from /var/lib/gems/1.9.1/gems/mongoid-3.1.3/lib/mongoid/persistence/operations/insert.rb:26:in `persist'
from /var/lib/gems/1.9.1/gems/mongoid-3.1.3/lib/mongoid/persistence.rb:51:in `insert'
from /var/lib/gems/1.9.1/gems/mongoid-3.1.3/lib/mongoid/persistence.rb:80:in `save'
from test.rb:66:in `<main>'