acts_as_most_popular Wolfram Arnold RubyFocus

User Activity Tracking

Join between: Viewable entity (user profile, image, post, video ...) Activity tracking (viewings, comments, ratings ...)

Join between:

Viewable entity

(user profile, image, post, video ...)

Activity tracking

(viewings, comments, ratings ...)

Item.find(:all, :select => 'items.*, COUNT(*) AS viewing_count', :joins => :viewings, :limit => limit, :group => 'viewings.item_id', :order => 'viewing_count DESC')

Item.find(:all,

:select => 'items.*,

COUNT(*) AS viewing_count',

:joins => :viewings,

:limit => limit,

:group => 'viewings.item_id',

:order => 'viewing_count DESC')

acts_as_most_popular

acts_as_most_popular

acts_as_most_popular I want: Most popular list from cache Cache populared from database once List automatically kept sorted & indexed in cache I need: A caching framework Ideally something common, transparent & flexible

I want:

Most popular list from cache

Cache populared from database once

List automatically kept sorted & indexed in cache

I need:

A caching framework

Ideally something common, transparent & flexible

Cache Money

Cache Money Transparent find vs. get_cache Sequence AR Cache SQL find -> get -> select update -> set -> update create -> add -> insert destroy -> delete/expire -> delete Maintains indices automatically!

Transparent

find vs. get_cache

Sequence

AR Cache SQL

find -> get -> select

update -> set -> update

create -> add -> insert

destroy -> delete/expire -> delete

Maintains indices automatically!

Cache Money Instance methods on models: get set repository Automatic key handling User.set(“new_key”) -> Key: “User:1/new_key”

Instance methods on models:

get

set

repository

Automatic key handling

User.set(“new_key”)

-> Key: “User:1/new_key”

Solution

acts_as_most_popular Additional index, sorted by activity count primed on first access maintained via after_add, after_remove callbacks

Additional index, sorted by activity count

primed on first access

maintained via after_add, after_remove callbacks

Definition class Item < ActiveRecord::Base has_many :viewings acts_as_most_popular :activity_association => :viewings, :limit => 5, :db_finder_args => { :select => 'item_id, COUNT(*) AS activity_count', :group => 'item_id' } end

class Item < ActiveRecord::Base

has_many :viewings

acts_as_most_popular

:activity_association => :viewings,

:limit => 5,

:db_finder_args =>

{ :select => 'item_id,

COUNT(*) AS activity_count',

:group => 'item_id' }

end

Usage class StatsController < Application def most_popular @items = Item.most_popular end end

class StatsController < Application

def most_popular

@items = Item.most_popular

end

end

References Cache Money http://magicscalingsprinkles.wordpress.com/2008/12/11/introducing-cache-money/ http://github.com/nkallen/cache-money/tree/master Images http://www.flickr.com/photos/flirtykitty/142229288/ http://www.flickr.com/photos/jojakeman/2434236126/

Cache Money

http://magicscalingsprinkles.wordpress.com/2008/12/11/introducing-cache-money/

http://github.com/nkallen/cache-money/tree/master

Images

http://www.flickr.com/photos/flirtykitty/142229288/

http://www.flickr.com/photos/jojakeman/2434236126/

Thank You! Wolfram Arnold RubyFocus [email_address]

Thank You!

Wolfram Arnold

RubyFocus

[email_address]