discourse/db/migrate/20130322183614_add_percent_...

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class AddPercentRankToPosts < ActiveRecord::Migration
def change
add_column :posts, :percent_rank, :float, default: 1.0
execute "UPDATE posts SET percent_rank = x.percent_rank
FROM (SELECT id, percent_rank()
OVER (PARTITION BY topic_id ORDER BY SCORE DESC)
FROM posts) AS x
WHERE x.id = posts.id"
end
end