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