How to keep the original sort in distinct.

[Larry Zhao]

Dear guys,

I have the following model:

class Message

  include Mongoid::Document

  include Mongoid::Timestamps

  field :conversation_id, :type => String

end

So if I do:

Message.all.order_by(:created_at, :desc).distinct(:conversation_id)

I am hoping that the array which contains ``conversation_id``s could preserve the order from the result of ``Message.all.order_by(:created_at, :desc)`` But as I tested, it seems that the result of distinct will is in an order like (:id, :asc). Is there a recommended way to do that? 

Cheers,

--- 

Larry Zhao

[Durran Jordan]

Unfortunately no at the moment. The distinct command does not take any order options. There is an open issue: https://jira.mongodb.org/browse/SERVER-2130

2012/6/13 Larry Zhao <thehidd...@gmail.com>