Mongoid: No Heritage

mongoid_no_heritage.rb

module Mongoid

  # Public: Allows to use inheritance to reuse logic, without using Single-
  # Collection Inheritance, storing the model and superclass in different
  # collections.
  module NoHeritage
    extend ActiveSupport::Concern

    included do
      # Internal: Preserve the default storage options instead of storing in the
      # same collection than the superclass.
      delegate :storage_options, to: :class
    end

    module ClassMethods
      # Internal: Prevent adding _type in query selectors, and adding an index
      # for _type.
      def hereditary?
        false
      end

      # Internal: Prevent Mongoid from defining a _type getter and setter.
      def field(name, options = {})
        super unless name.to_sym == :_type
      end

      # Internal: Preserve the default storage options instead of storing in the
      # same collection than the superclass.
      def inherited(subclass)
        super

        def subclass.storage_options
          @storage_options ||= storage_options_defaults
        end
      end
    end
  end
end

"hacky at best, more likely a problem waiting for the next Mongoid update to blow up"

And helluv good idea! Let's gem this!

EDIT: Also, to add on your pro list: Avoids using :_type on every search!

Hi ElMassimo,

What is the license on this code? Can we use it freely for commercial use without attribution?

Thank you!

Warmest regards,

Ben