t

ruby-1.9.2-rc1 > f = Father.new
 => #<Father id: nil, name: nil, created_at: nil, updated_at: nil> 
ruby-1.9.2-rc1 > f.name = "Dave"
 => "Dave" 
ruby-1.9.2-rc1 > s = Son.new :name => "Nate"
 => #<Son id: nil, name: "Nate", father_id: nil, created_at: nil, updated_at: nil> 
ruby-1.9.2-rc1 > f.son
f.son_ids   f.sons      f.sons=     f.son_ids=  
ruby-1.9.2-rc1 > f.sons << s
 => [#<Son id: nil, name: "Nate", father_id: nil, created_at: nil, updated_at: nil>] 
ruby-1.9.2-rc1 > f.save!
 => true 
ruby-1.9.2-rc1 > Son.all
 => [#<Son id: 1, name: "Nate", father_id: 1, created_at: "2010-07-09 02:36:21", updated_at: "2010-07-09 02:36:21">] 
ruby-1.9.2-rc1 > stepfather = f.clone
 => #<Father id: nil, name: "Dave", created_at: "2010-07-09 02:36:21", updated_at: "2010-07-09 02:36:21"> 
ruby-1.9.2-rc1 > stepfather.sons << s
 => [#<Son id: 1, name: "Nate", father_id: 1, created_at: "2010-07-09 02:36:21", updated_at: "2010-07-09 02:36:21">, #<Son id: 1, name: "Nate", father_id: 1, created_at: "2010-07-09 02:36:21", updated_at: "2010-07-09 02:36:21">] 
ruby-1.9.2-rc1 > stepfather.save!
 => true 
ruby-1.9.2-rc1 > Son.all
 => [#<Son id: 1, name: "Nate", father_id: 1, created_at: "2010-07-09 02:36:21", updated_at: "2010-07-09 02:36:21">] 
ruby-1.9.2-rc1 > stepfather.id
 => 2 
ruby-1.9.2-rc1 >