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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Repo.Migrations.MigrateFollowingRelationships do
use Ecto.Migration
def change do
execute(import_following_from_users(), "")
execute(import_following_from_activities(), restore_following_column())
end
defp import_following_from_users do
"""
INSERT INTO following_relationships (follower_id, following_id, state, inserted_at, updated_at)
SELECT
relations.follower_id,
following.id,
'accept',
now(),
now()
FROM (
SELECT
users.id AS follower_id,
unnest(users.following) AS following_ap_id
FROM
users
WHERE
users.following != '{}'
AND users.local = false OR users.local = true AND users.email IS NOT NULL -- Exclude `internal/fetch` and `relay`
) AS relations
JOIN users AS "following" ON "following".follower_address = relations.following_ap_id
WHERE relations.follower_id != following.id
ON CONFLICT DO NOTHING
"""
end
defp import_following_from_activities do
"""
INSERT INTO
following_relationships (
follower_id,
following_id,
state,
inserted_at,
updated_at
)
SELECT
followers.id,
following.id,
activities.data ->> 'state',
(activities.data ->> 'published') :: timestamp,
now()
FROM
activities
JOIN users AS followers ON (activities.actor = followers.ap_id)
JOIN users AS following ON (activities.data ->> 'object' = following.ap_id)
WHERE
activities.data ->> 'type' = 'Follow'
AND activities.data ->> 'state' IN ('accept', 'pending', 'reject')
ORDER BY activities.updated_at DESC
ON CONFLICT DO NOTHING
"""
end
defp restore_following_column do
"""
UPDATE
users
SET
following = following_query.following_array,
updated_at = now()
FROM (
SELECT
follower.id AS follower_id,
CASE follower.local
WHEN TRUE THEN
array_prepend(follower.follower_address, array_agg(following.follower_address))
ELSE
array_agg(following.follower_address)
END AS following_array
FROM
following_relationships
JOIN users AS follower ON follower.id = following_relationships.follower_id
JOIN users AS following ON following.id = following_relationships.following_id
GROUP BY
follower.id) AS following_query
WHERE
following_query.follower_id = users.id
"""
end
end
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