How to reference an embedded document in Mongoid?

user_431912 0
Viewed 10464

Using Mongoid, let's say I have the following classes:

class Map
  include Mongoid::Document

  embeds_many :locations
end

class Location
  include Mongoid::Document

  field :x_coord, :type => Integer
  field :y_coord, :type => Integer

  embedded_in      :map, :inverse_of => :locations
end


class Player
  include Mongoid::Document

  references_one   :location
end

As you can see, I'm trying to model a simple game world environment where a map embeds locations, and a player references a single location as their current spot.

Using this approach, I'm getting the following error when I try to reference the "location" attribute of the Player class:

Mongoid::Errors::DocumentNotFound: Document not found for class Location with id(s) xxxxxxxxxxxxxxxxxxx.

My understanding is that this is because the Location document is embedded making it difficult to reference outside the scope of its embedding document (the Map). This makes sense, but how do I model a direct reference to an embedded document?

mongoid mongodb ruby
5 Answers

PLEASE go and VOTE for the "virtual collections" feature on MongoDB's issue tracker:

http://jira.mongodb.org/browse/SERVER-142

It's the 2nd most requested feature, but it still hasn't been scheduled for release. Maybe if enough people vote for it and move it to number one, the MongoDB team will finally implement it.

user_4578190
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