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