The slides from my lightning talk on basic reporting using CouchDB. Given at SDRuby.

1. Basic Reporting with
CouchDB
How to query with MapReduce rather than SQL

2. CouchRest
• An ORM for CouchDB
• CRUD works just like you think it would:
create, get, save, destroy, etc
• Schema-less. Objects extend from Hash.

3. The Event Object
class Event < ::CouchRest::ExtendedDocument
use_database
::Database.depot_report_server.default_database
# Accessors
property :event
property :email
property :datetime, :cast_as => "Time"
property :referer
property :duration
end

4. Create an Event!
event = Event.new( :event => "purchase",
:email => session.user.email,
:datetime => Time.now,
:referer => request.referer,
:duration => Time.now - start_time
)
event[:price] = 30
event.create

5. Find by email
class Event < ::CouchRest::ExtendedDocument
...
view_by :email,
:map => "function(doc) {
emit(doc['email'], 1);
}",
:reduce => "_sum"
end
Event.by_email(:key => "john@example.com")
Event.by_email(:raw => true, :group => true, :reduce =>
true)

6. Map

7. Reduce

8. Query a Date Range
class Event < ::CouchRest::ExtendedDocument
...
view_by :event_and_date,
:map => "function(doc) {
if(doc['datetime'] && doc['event']) {
var date = new Date(doc['datetime']);
var year = date.getFullYear();
var month = date.getMonth();
var day = date.getDate();
emit([doc['event'], year, month, day], 1);
}
}",
:reduce => "_sum"
end

9. Reduce to get Totals

10. Adjust Granularity with
group_level

11. Mash it up!