Rails 6: ActiveRecord

Transcript

1. NIKOLAY SVERCHKOV @ssnickolay
   ACTIVE RECORD 6+
   

   View Slide

2. #saintprubyconf @ssnickolay
   

   View Slide

3. @ssnickolay
   RAILS 6.0
   MULTIPLE
   DATABASE
   SUPPORT
   

   View Slide

4. @ssnickolay
   gem ‘octopus’
   

   View Slide

5. @ssnickolay
   gem ‘octopus’
   FOCUSED ON
   

   View Slide

6. @ssnickolay
   RAILS 6.0: MULTI DB
   MULTI DB =
   DB SHARDING =
   +
   + +
   VERTICAL OR HORIZONTAL
   PARTITIONING / REPLICATION
   

   View Slide

7. @ssnickolay
   RAILS 6.0: MULTI DB
   RAILS DID NOT HAVE
   ADEQUATE* MULTI DB
   SUPPORT
   *https://github.com/ankane/multiverse
   

   View Slide

8. @ssnickolay
   RAILS 6.0: MULTI DB
   MULTI DB !!=
   DATABASE SHARDING
   

   View Slide

9. @ssnickolay
   AT LEAST 12 HUGE PRS
   FROM @EILEENCODES
   RAILS 6.0: MULTI DB
   

   View Slide

10. WHEN YOU
    RELEASE
    THE NEW
    FEATURE
    

    View Slide

11. @ssnickolay
    RAILS 6.0: MULTI DB
    MULTI DB !!=
    DATABASE SHARDING
    ?
    

    View Slide

12. @ssnickolay
    RAILS 6.0: MULTI DB
    MULTI DB !!=
    DATABASE SHARDING
    

    View Slide

13. @ssnickolay
    RAILS 6.0: BULK INSERTS
    # Insert multiple records, performing an upsert
    # when records have duplicate ISBNs
    Book.upsert_all([
    { title: 'Rework', author: 'David', isbn: '1' },
    { title: 'Eloquent Ruby', author: 'Russ', isbn: '1' }
    ],
    unique_by: { columns: %w[ isbn ] })
    *gem ‘activerecord-import`
    

    View Slide

14. @ssnickolay
    RAILS 6.0: update
    Rails 4.0.2
    update_attributes(column: value)
    update(column: value)
    Rails 6+
    update(column: value)
    Deprecate `update_attributes`
    

    View Slide

15. @ssnickolay
    RAILS 6.0: update
    Rails 4.0.2
    update_attributes(column: value)
    update(column: value)
    Rails 6+
    update(column: value)
    Deprecate `update_attributes`
    

    View Slide

16. @ssnickolay
    RAILS 6.0: create_or_find_by
    find_or_create_by
    vs
    create_or_find_by
    

    View Slide

17. @ssnickolay
    find_or_create_by
    def find_or_create_by!(attributes, &block)
    find_by(attributes) !||
    create!(attributes, &block)
    end
    

    View Slide

18. @ssnickolay
    find_or_create_by
    def find_or_create_by!(attributes, &block)
    find_by(attributes) !|| <Вот-Тут->
    create!(attributes, &block)
    end
    

    View Slide

19. @ssnickolay
    RAILS 6.0: create_or_find_by
    def create_or_find_by(attributes, &block)
    transaction(requires_new: true) {
    create(attributes, &block)
    }
    rescue ActiveRecord!::RecordNotUnique
    find_by!(attributes)
    end
    

    View Slide

20. @ssnickolay
    RAILS 6.0: create_or_find_by
    def create_or_find_by(attributes, &block)
    transaction(requires_new: true) {
    create(attributes, &block)
    }
    rescue ActiveRecord!::RecordNotUnique
    <Вот-Тут->
    find_by!(attributes)
    end
    

    View Slide

21. @ssnickolay
    RAILS 6.0: Other
    • Make t.timestamps with precision by default
    • Add support for UNLOGGED Postgresql tables
    • Add support for annotating queries generated by
    ActiveRecord::Relation with SQL comments
    • Make it possible to override the implicit order column
    • …
    

    View Slide