1. RAILS 3.1 FTW!
Krzysztof Jablonski
Grzegorz Witek

2. SHORT AGENDA
New default gems
New file structure
Reversible Migrations
ActiveRecord Identity Map
Prepared statements
Automatic flushing
Serialization

3. NEW DEFAULT GEMS
Sass
CoffeScript
Uglifier
jQuery
Turn

4. TURN

5. NEW FILE STRUCTURE

6. REVERSIBLE MIGRATIONS
Before After
Result

7. ACTIVERECORD
IDENTITY MAP
Before

8. ACTIVERECORD
IDENTITY MAP
After

9. PREPARED
STATEMENTS
Before:
parse query
prepare execution plan
execute plan
return results
“select * from workers where id=10”

10. PREPARED
STATEMENTS
After:
execute plan
return results
What about 2 previous steps? They’re cached!
first time: “select * from workers where id=?”
then: received token + “id=10”
Problem with MySQL

11. AUTOMATIC FLUSHING
Before

12. AUTOMATIC FLUSHING
Before
After

13. SERIALIZE
ATTRIBUTES
Before:
serialize :preferences
After:
serialize :preferences OR
serialize :preferences SerializerClass.new

14. SERIALIZE
ATTRIBUTES
class SerializerClass
def load(values)
...
end
def dump(text)
...
end
end

15. ANY QUESTIONS?
Thanks for your attention!
For more information about Rails 3.1 please check this site:
Also, we encourage you to see this year’s RailsConf videos:
http://www.youtube.com/user/OreillyMedia