discourse/db/migrate/20120708210305_add_last_pos...

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# frozen_string_literal: true
class AddLastPostedAtToUsers < ActiveRecord::Migration[4.2]
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def change
add_column :users, :last_posted_at, :datetime, null: true
add_index :users, :last_posted_at
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execute "UPDATE users
SET last_posted_at = (SELECT MAX(posts.created_at)
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FROM posts
WHERE posts.user_id = users.id)"
end
end