discourse/db/migrate/20160118233631_backfill_inc...

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class BackfillIncomingEmails < ActiveRecord::Migration[4.2]
def up
execute <<-SQL
INSERT INTO incoming_emails (post_id, created_at, updated_at, user_id, topic_id, message_id, from_address, to_addresses, subject)
SELECT posts.id
, posts.created_at
, posts.created_at
, posts.user_id
, posts.topic_id
, array_to_string(regexp_matches(posts.raw_email, '^\s*Message-Id: .*<([^>]+)>', 'im'), '')
, users.email
, array_to_string(regexp_matches(array_to_string(regexp_matches(posts.raw_email, '^to:.+$', 'im'), ''), '[^<\s"''(]+@[^>\s"'')]+'), '')
, topics.title
FROM posts
JOIN topics ON posts.topic_id = topics.id
JOIN users ON posts.user_id = users.id
WHERE posts.user_id IS NOT NULL
AND posts.topic_id IS NOT NULL
AND posts.via_email = 't'
AND posts.raw_email ~* 'Message-Id'
ORDER BY posts.id;
SQL
end
def down
raise ActiveRecord::IrreversibleMigration
end
end