| Module | Sequel::Plugins::NestedAttributes | 
| In: | lib/sequel/plugins/nested_attributes.rb | 
The nested_attributes plugin allows you to update attributes for associated objects directly through the parent object, similar to ActiveRecord‘s Nested Attributes feature.
Nested attributes are created using the nested_attributes method:
  Artist.one_to_many :albums
  Artist.nested_attributes :albums
  a = Artist.new(:name=>'YJM',
   :albums_attributes=>[{:name=>'RF'}, {:name=>'MO'}])
  # No database activity yet
  a.save # Saves artist and both albums
  a.albums.map{|x| x.name} # ['RF', 'MO']