honkoma/priv/repo/migrations/20200914105638_delete_notif...

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2020-09-14 11:08:12 +00:00
defmodule Pleroma.Repo.Migrations.DeleteNotificationWithoutActivity do
use Ecto.Migration
import Ecto.Query
alias Pleroma.Repo
def up do
from(
q in Pleroma.Notification,
left_join: c in assoc(q, :activity),
select: %{id: type(q.id, :integer)},
where: is_nil(c.id)
)
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|> Repo.chunk_stream(1_000, :batches)
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|> Stream.each(fn records ->
notification_ids = Enum.map(records, fn %{id: id} -> id end)
Repo.delete_all(
from(n in "notifications",
where: n.id in ^notification_ids
)
)
end)
|> Stream.run()
end
def down do
:ok
end
end