discourse/db/migrate/20120702211427_create_repli...

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# frozen_string_literal: true
class CreateReplies < ActiveRecord::Migration[4.2]
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def change
create_table :post_replies, id: false do |t|
t.references :post
t.integer :reply_id
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t.timestamps null: false
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end
add_index :post_replies, [:post_id, :reply_id], unique: true
execute "INSERT INTO post_replies (post_id, reply_id, created_at, updated_at)
SELECT p2.id, p.id, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
FROM posts AS p
INNER JOIN posts AS p2 on p2.post_number = p.reply_to_post_number AND p2.forum_thread_id = P.forum_thread_id
WHERE p.forum_thread_id IS NOT NULL"
end
end