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mobilizon/priv/repo/migrations/20210622133516_cleanup_posts.exs

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Elixir
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defmodule Mobilizon.Storage.Repo.Migrations.CleanupPosts do
use Ecto.Migration
def up do
# Make sure we don't have any duplicate posts
rows = fetch_bad_rows()
Enum.each(rows, &process_row/1)
end
def down do
# No way down
end
defp fetch_bad_rows() do
%Postgrex.Result{rows: rows} =
Ecto.Adapters.SQL.query!(
Mobilizon.Storage.Repo,
"SELECT * FROM (
SELECT id, url,
ROW_NUMBER() OVER(PARTITION BY url ORDER BY inserted_at asc) AS Row
FROM posts
) dups
WHERE dups.Row > 1;"
)
rows
end
defp process_row([id, url, _row]) do
first_id = find_first_post_id(url)
if id != first_id do
repair_post_medias(id, first_id)
repair_post_tags(id, first_id)
delete_row(id)
end
end
defp find_first_post_id(url) do
%Postgrex.Result{rows: [[id]]} =
Ecto.Adapters.SQL.query!(
Mobilizon.Storage.Repo,
"SELECT id FROM posts WHERE url = $1 order by inserted_at asc limit 1",
[url]
)
id
end
defp repair_post_medias(id, first_id) do
Ecto.Adapters.SQL.query!(
Mobilizon.Storage.Repo,
"UPDATE posts_medias SET post_id = $1 WHERE post_id = $2",
[first_id, id]
)
end
defp repair_post_tags(id, first_id) do
Ecto.Adapters.SQL.query!(
Mobilizon.Storage.Repo,
"UPDATE posts_tags SET post_id = $1 WHERE post_id = $2",
[first_id, id]
)
end
defp delete_row(id) do
Ecto.Adapters.SQL.query!(
Mobilizon.Storage.Repo,
"DELETE FROM posts WHERE id = $1",
[id]
)
end
end