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ActiveRecord Associations(2) - RORLab Season 3-8

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June 04, 2013
Programming
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ActiveRecord Associations(2) - RORLab Season 3-8

about ActiveRecord Polymorphic, Self-join

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seapy

June 04, 2013

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Transcript

  1. Active Record Associations (2) Ror lab. season 3 - the

    8th round - Jung 4, 2013 ChangHoon Jeong(@seapy)

  2. Product id Employee id Picture Polymorphic Picture employee_id product_id x

  3. Product id Employee id Polymorphic What about this “Picture” model

    ? Picture employee_id product_id Picture product_id employee_id

  4. Polymorphic Picture Picture Employee Product id id Imageable Imageable id

    id imageable_id imageable_id :imageable_id :imageable_type :as => :imageable

  5. Polymorphic Model Class

  6. Polymorphic Migration

  7. Self Joins • ex. : following or follower

  8. 감사합니다.