discourse/db/migrate/20120704201743_add_view_cou...

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class AddViewCountToPosts < ActiveRecord::Migration[4.2]
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def change
add_column :posts, :views, :integer, default: 0, null: false
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execute "UPDATE posts SET views =
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(SELECT COUNT(*) FROM post_timings WHERE forum_thread_id = posts.forum_thread_id AND post_number = posts.post_number)"
end
end