Mongoid Association Matchers

# Mongoid association matchers for RSpec 2.x and 1.x
#
# Save this file to your spec/support directory
#
# Usage:
#
# describe User do
#   it { should reference_one :profile }
# end
#
# describe Profile do
#   it { should be_referenced_in :user }
# end

module Matchers
  module Mongoid
    module Associations
      def reference_one(attr)
        AssociationMatcher.new(attr, ::Mongoid::Associations::ReferencesOne)
      end
      
      def reference_many(attr)
        AssociationMatcher.new(attr, ::Mongoid::Associations::ReferencesMany)
      end
      
      def be_referenced_in(attr)
        AssociationMatcher.new(attr, ::Mongoid::Associations::ReferencedIn)
      end

      def embed_one(attr)
        AssociationMatcher.new(attr, ::Mongoid::Associations::EmbedsOne)
      end
      
      def embed_many(attr)
        AssociationMatcher.new(attr, ::Mongoid::Associations::EmbedMany)
      end
      
      def be_embedded_in(attr)
        AssociationMatcher.new(attr, ::Mongoid::Associations::EmbeddedIn)
      end
      
      class AssociationMatcher
        attr_accessor :attr, :association_type
        
        def initialize(attr, association_type)
          self.attr             = attr.to_s
          self.association_type = association_type
        end
        
        def matches?(subject)
          @subject = subject
          a        = @subject.associations.select { |k,v| v.association == association_type }
          a.detect { |k| k.first == attr } != nil
        end
        
        def description
          "has #{humanized_association} association :#{attr}"
        end
        
        def failure_message_for_should
          "\n#{humanized_association} association failure\nExpected: '#{attr}'"
        end
        
        private
        
        def humanized_association
          association_type.to_s.split('::').last
        end
        
      end
    end

  end
end

if defined?(RSpec) # RSpec 2.x
  RSpec.configure do |config|
    config.include(Matchers::Mongoid::Associations)
  end
elsif defined?(Spec) # RSpec 1.x
  Spec::Runner.configure do |config|
    config.include(Matchers::Mongoid::Associations)
  end
end

Might want to check out http://github.com/evansagge/mongoid-rspec.git