2017-08-31 12:06:56 +08:00
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class DenormalizeExpressions < ActiveRecord::Migration[4.2]
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2013-02-06 03:16:51 +08:00
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def change
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# Denormalizing this makes our queries so, so, so much nicer
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add_column :posts, :expression1_count, :integer, null: false, default: 0
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add_column :posts, :expression2_count, :integer, null: false, default: 0
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add_column :posts, :expression3_count, :integer, null: false, default: 0
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add_column :posts, :expression4_count, :integer, null: false, default: 0
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add_column :posts, :expression5_count, :integer, null: false, default: 0
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add_column :forum_threads, :expression1_count, :integer, null: false, default: 0
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add_column :forum_threads, :expression2_count, :integer, null: false, default: 0
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add_column :forum_threads, :expression3_count, :integer, null: false, default: 0
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add_column :forum_threads, :expression4_count, :integer, null: false, default: 0
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add_column :forum_threads, :expression5_count, :integer, null: false, default: 0
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(1..5).each do |i|
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execute "update posts set expression#{i}_count = (select count(*) from expressions where parent_id = posts.id and expression_type_id = #{i})"
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execute "update forum_threads set expression#{i}_count = (select sum(expression#{i}_count) from posts where forum_thread_id = forum_threads.id)"
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end
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end
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end
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