Mongo_mapper_multi_modifiers is a project mainly written in Ruby, it's free.
A MongoMapper plugin that allows multiple modifications to a document in a single update.
h1. MongoMapper Multi-Modifiers
This is a plugin for MongoMapper that allows updates to multiple fields in a single document within a single update call.
h2. Example
Foo.modify(:title => "My Favorite Colors") do
push(:colors => ["red", "blue"])
increment(:num_colors => 2)
end
h2. TODO