# Product embeds many Variations.
# this is a totally empty rails 3 ruby 1.9.2 project specifically for testing mongoid

# setup a product
> p = Product.create
 => #<Product _id: 4e2c05a32abea95226000001, _type: nil, tag_ids: []> 
>  p.variations.create
 => #<Variation _id: 4e2c05a52abea95226000002, _type: nil, name: nil> 

# get the product
> p = Product.last
 => #<Product _id: 4e2c05a32abea95226000001, _type: nil, tag_ids: []> 
> a = p.attributes
 => {"_id"=>BSON::ObjectId('4e2c05a32abea95226000001'), "tag_ids"=>[], "variations"=>[{"_id"=>BSON::ObjectId('4e2c05a52abea95226000002')}]} 
> p = Product.last
 => #<Product _id: 4e2c05a32abea95226000001, _type: nil, tag_ids: []> 

# update it with its own attributes
> p.update_attributes(a)
 => true 

# the embedded document has been duplicated and even has the same ID.
> Product.last.variations
 => [#<Variation _id: 4e2c05a52abea95226000002, _type: nil, name: nil>, #<Variation _id: 4e2c05a52abea95226000002, _type: nil, name: nil>]