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mobilizon/priv/repo/migrations/20210427091034_repair_users_default_actors.exs

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defmodule Mobilizon.Storage.Repo.Migrations.RepairUsersDefaultActors do
use Ecto.Migration
def up do
rows = fetch_bad_rows()
Enum.each(rows, &process_row/1)
end
def down do
# Nothing to do
end
defp fetch_bad_rows() do
%Postgrex.Result{rows: rows} =
Ecto.Adapters.SQL.query!(
Mobilizon.Storage.Repo,
"SELECT u.id FROM users u JOIN actors a ON u.default_actor_id = a.id WHERE a.user_id IS NULL"
)
rows
end
defp process_row([user_id]) do
user_id
|> find_first_actor_id()
|> repair_user_default_actor(user_id)
end
defp find_first_actor_id(user_id) do
%Postgrex.Result{rows: [[id]]} =
Ecto.Adapters.SQL.query!(
Mobilizon.Storage.Repo,
"SELECT id FROM actors WHERE user_id = $1 AND type = 'Person' AND NOT suspended ORDER BY id LIMIT 1",
[user_id]
)
id
end
defp repair_user_default_actor(actor_id, user_id) do
Ecto.Adapters.SQL.query!(
Mobilizon.Storage.Repo,
"UPDATE users SET default_actor_id = $1 WHERE id = $2",
[actor_id, user_id]
)
end
end