afeld/mongoid-locker

module Mongoid
  module Locker
    # Normalizes queries between various Mongoid versions.
    module Wrapper
      # Update the document for the provided Class matching the provided query with the provided setter.
      #
      # @param [Class] The model class
      # @param [Hash] The Mongoid query
      # @param [Hash] The Mongoid setter
      # @return [Boolean] true if the document was successfully updated, false otherwise
      def self.update(klass, query, setter)
        rc = klass.with(write: { w: 1 }).collection.find(query).update_one(setter)
        rc.ok? && rc.documents.first['n'] == 1
      end

      # Determine whether the provided document is locked in the database or not.
      #
      # @param [Class] The model instance
      # @return [Time] The timestamp of when the document is locked until, nil if not locked.
      def self.locked_until(doc)
        existing_query = { _id: doc.id, locked_until: { '$exists' => true } }
        existing = doc.class.where(existing_query).limit(1).only(:locked_until).first
        existing ? existing.locked_until : nil
      end
    end
  end
end