Query on Mongoid Hash Field
Person.where('things.tv' => 'Samsung').firstThis is where Mongoid and MongoDB really shine. Mongoid's Criteria methods (Person.where, Person.any_of, Person.excludes, etc.) will give you much more flexibility than the ActiveRecord-style finders (passing a :conditions hash to Person.find, Person.first, etc.)
Mongoid's site has some great documentation on how to use Criteria: