Active record makeover

•

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Marty Haught

15 minute talk given at Red Dirt Ruby Conf in Oklahoma City - May 6th

Tecnología

Active Record Makeover
Marty Haught
@mghaught
http://martyhaught.com

...but I can’t

• Existing system
• Project already committed

or doesn’t make sense

• Not the best ﬁt for project
• No signiﬁcant gain
• rdbms solves the problem

So where’s the love?

• Where’s the new hotness
• Envious of the nosql gems
• Want a better way to model data

Rails 3’s ActiveRecord

Unpimp your auto

Engine’s been rebuilt

• ActiveRelation
• arel gem - relational algebra
• Consistency under the hood

Easier to model with

• Simpler api
• Fully chainable
• Lazy loaded

Behaves like the model
new
create delete
create! delete_all
ﬁnd update
destroy update_all
destroy_all exists?

Lazy loaded
• won’t interact with the db until accessed
• such as each, map, etc.
• force load - all, ﬁrst, last

Extend the possibilities

• ActiveRecord::QueryMethods opens a door
• invokes to_sql on where_values unless a String
• pass in your own objects that create sql

MetaSearch & MetaWhere
Ernie Miller

http://github.com/ernie/meta_where
http://github.com/ernie/meta_search

Got some hotness

• new engine
• concise and readable
• simpler to model
• ﬂexible
• extendable

Thank you
Marty Haught
@mghaught
mghaught@gmail.com
http://martyhaught.com

Image Credits
wagon - http://www.ﬂickr.com/photos/halfy/3410561333
vw car - http://www.youtube.com/watch?v=qgEvy60bZYI
white race car - http://www.ﬂickr.com/photos/33031095@N03/4538638400/
yellow sports car - http://www.ﬂickr.com/photos/retinafunk/57699167/
red sports car - http://www.ﬂickr.com/photos/freefoto/3844246045/
gray sports car - http://www.ﬂickr.com/photos/doramosnoopy/2479741916/
blue sports car - http://www.ﬂickr.com/photos/chorwedel/4398697300/
racing cars - http://www.ﬂickr.com/photos/oizumi/2582189751/

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Active record makeover

1. Active Record Makeover Marty Haught @mghaught http://martyhaught.com

2. Boulder Ruby Longmont, Colorado

3. ActiveRecord feels like

4. Growing tired of this

5. Wished I was driving...

6. ...but I can’t • Existing system • Project already committed

7. or doesn’t make sense • Not the best ﬁt for project • No signiﬁcant gain • rdbms solves the problem

8. So where’s the love? • Where’s the new hotness • Envious of the nosql gems • Want a better way to model data

9. Rails 3’s ActiveRecord Unpimp your auto

10. Engine’s been rebuilt • ActiveRelation • arel gem - relational algebra • Consistency under the hood

11. Easier to model with • Simpler api • Fully chainable • Lazy loaded

12. ﬁnd all Rails 2x Rails 3

13. ﬁrst, last, count Rails 2x Rails 3

14. Finder methods

15. Chainable Rails 2x Rails 3

16. What about scopes? Rails 2x Rails 3

17. Reusing scopes

18. Merging scopes

19. Using scoped

20. Mix and match

21. Behaves like the model new create delete create! delete_all ﬁnd update destroy update_all destroy_all exists?

22. Building with where values

23. Lazy loaded • won’t interact with the db until accessed • such as each, map, etc. • force load - all, ﬁrst, last

24. Plays nice with caching

25. Modeling with class

26. to_sql

27. where_values

28. Extend the possibilities • ActiveRecord::QueryMethods opens a door • invokes to_sql on where_values unless a String • pass in your own objects that create sql

29. MetaSearch & MetaWhere Ernie Miller http://github.com/ernie/meta_where http://github.com/ernie/meta_search

30. Got some hotness • new engine • concise and readable • simpler to model • ﬂexible • extendable

31. Go have fun, get dirty

32. Thank you Marty Haught @mghaught mghaught@gmail.com http://martyhaught.com Image Credits wagon - http://www.flickr.com/photos/halfy/3410561333 vw car - http://www.youtube.com/watch?v=qgEvy60bZYI white race car - http://www.flickr.com/photos/33031095@N03/4538638400/ yellow sports car - http://www.flickr.com/photos/retinafunk/57699167/ red sports car - http://www.flickr.com/photos/freefoto/3844246045/ gray sports car - http://www.flickr.com/photos/doramosnoopy/2479741916/ blue sports car - http://www.flickr.com/photos/chorwedel/4398697300/ racing cars - http://www.flickr.com/photos/oizumi/2582189751/

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