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ruby-1.8.7-p330 :010 > u = User.last

 => #<User id: 1, provider: nil, uid: nil, name: "Bradley Joyce", created_at: "2011-02-02 03:35:42", updated_at: "2011-02-02 03:35:42">

 

ruby-1.8.7-p330 :011 > u.grades

 => []

 

ruby-1.8.7-p330 :012 > u.grades.create(:letter => 'A')

 => #<Grade id: 20, score: 4.0, created_at: "2011-02-08 04:13:11", updated_at: "2011-02-08 04:13:11", user_id: 1>

 

ruby-1.8.7-p330 :013 > u.grades.create(:letter => 'B')

 => #<Grade id: nil, score: nil, created_at: nil, updated_at: nil, user_id: 1>

 

ruby-1.8.7-p330 :014 > u.grades

 => [#<Grade id: 20, score: 4.0, created_at: "2011-02-08 04:13:11", updated_at: "2011-02-08 04:13:11", user_id: 1>, #<Grade id: nil, score: nil, created_at: nil, updated_at: nil, user_id: 1>]