discourse/db/migrate/20120629150253_denormalize_...

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2013-02-05 14:16:51 -05:00
class DenormalizeExpressions < ActiveRecord::Migration
def change
# Denormalizing this makes our queries so, so, so much nicer
add_column :posts, :expression1_count, :integer, null: false, default: 0
add_column :posts, :expression2_count, :integer, null: false, default: 0
add_column :posts, :expression3_count, :integer, null: false, default: 0
add_column :posts, :expression4_count, :integer, null: false, default: 0
add_column :posts, :expression5_count, :integer, null: false, default: 0
add_column :forum_threads, :expression1_count, :integer, null: false, default: 0
add_column :forum_threads, :expression2_count, :integer, null: false, default: 0
add_column :forum_threads, :expression3_count, :integer, null: false, default: 0
add_column :forum_threads, :expression4_count, :integer, null: false, default: 0
add_column :forum_threads, :expression5_count, :integer, null: false, default: 0
(1..5).each do |i|
execute "update posts set expression#{i}_count = (select count(*) from expressions where parent_id = posts.id and expression_type_id = #{i})"
execute "update forum_threads set expression#{i}_count = (select sum(expression#{i}_count) from posts where forum_thread_id = forum_threads.id)"
end
end
end