I hereby claim:
- I am mpakes on github.
- I am mpakes (https://keybase.io/mpakes) on keybase.
- I have a public key whose fingerprint is A4D5 4452 8979 CEA0 1CA9 A939 AAB9 0D9A C8E7 4C82
To claim this, I am signing this object:
I hereby claim:
To claim this, I am signing this object:
# Credit to Mike Perham for this gem of an idea | |
# http://www.mikeperham.com/2007/12/17/creating-a-counter_cache-column/ | |
class RailsMigration < ActiveRecord::Migration | |
def self.up | |
add_column :media, :followers_count, :integer, :default => 0, :null => false | |
# Populate the media follower counter cache in one fell swoop. | |
sql = "update media, (select operable_id, count(*) as the_count from follow_operations "\ | |
"group by operable_id) as follows set media.followers_count = follows.the_count "\ | |
"where media.id = follows.operable_id;" |