Rails - Oct 2013 - ActiveRecord, Squeel: Getting objects without parent associations

I have:

class ThingsCollection < ActiveRecord::Base
  has_and_belongs_to_many :things, uniq: true
end

class Thing < ActiveRecord::Base
  has_and_belongs_to_many :things_collections, uniq: true
end

I want to get Things which don''t have any ThingsCollections
(thing.things_colllection_ids.empty? == true). How can I do this via
ActiveRecord & Squeel? (Without SQL query if possible)

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