gistfile1.rb

# Warm the db by doing a find before the find_and_modify
find_record(
  'devices', 
  { :did => data[:did], :organization_id => BSON::ObjectId(data[:organization_id]) }, 
  { :fields => { :_id => 1 } }
)

device = find_and_modify_record(
  'devices',
  { :did => data[:did], :organization_id => BSON::ObjectId(data[:organization_id]) },
  { '$set' => { :did => data[:did], :organization_id => BSON::ObjectId(data[:organization_id]) } },
  { :fields => { :_id => 1 }, :upsert => true }
)