DateTime with MongoDB/Mongoid and Rails 3 Not Populating

Question

Here is the code in my Model

 include Mongoid::Document
 include Mongoid::Timestamps

 field :message, :type => String
 field :send_at, :type => DateTime
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Answer 1

Recent versions of Mongoid do handle multi-parameter attributes, you just have to include the module in your model:

include Mongoid::MultiParameterAttributes

Docs: http://mongoid.org/en/mongoid/docs/rails.html

Answer 2

Mongoid does not handle multiparameter attributes like Date yet, so you need to do the following:

# copied from: https://gist.github.com/315227
# add this to a new file in your lib directory
module MultiParameterAttributes
  def filter_time(attributes, name)
     attrs = attributes.collect do |key, value|
       if key =~ /^#{Regexp.escape(name.to_s)}\((\d+)(\w)\)$/
         [$1.to_i, value.send("to_#$2")]
       end
     end.compact.sort_by(&:first).map(&:last)
     Time.zone.local(*attrs) unless attrs.empty?
  end
end

# include the module above in your application_controller.rb
class ApplicationController < ActionController::Base
  include MultiParameterAttributes
end

# and in the controller action where you process the form params, use filter_time
class YourController < ApplicationController
  def your_action
    time = filter_time(params, :my_time_attribute_name)
  end
end

Some more info here: http://groups.google.com/group/mongoid/browse_thread/thread/f83cbdd641581912