discourse/db/migrate/20130203204338_add_last_ver...

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class AddLastVersionAtToPosts < ActiveRecord::Migration[4.2]
2013-02-05 14:16:51 -05:00
def change
add_column :posts, :last_version_at, :timestamp
execute "UPDATE posts SET last_version_at = COALESCE((SELECT max(created_at)
FROM versions WHERE versions.versioned_id = posts.id
AND versions.versioned_type = 'Post'), posts.created_at)"
change_column :posts, :last_version_at, :timestamp, null: false
end
end