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- class Album < ActiveRecord::Base
- has_many :songs
- belongs_to :artist
- has_many :transactions
- end
- class Artist < ActiveRecord::Base
- has_many :albums
- has_many :transactions
- end
- class Song < ActiveRecord::Base
- belongs_to :album
- has_many :transactions
- end
- class User < ActiveRecord::Base
- has_many :transactions
- end
- class Transaction < ActiveRecord::Base
- belongs_to :user
- belongs_to :album
- belongs_to :song
- belongs_to :artist
- end
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