mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 10:02:47 +00:00
167 lines
4.3 KiB
Go
167 lines
4.3 KiB
Go
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// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package migrations
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import (
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"context"
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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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"github.com/uptrace/bun"
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)
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func init() {
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up := func(ctx context.Context, db *bun.DB) error {
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// To update fave constraints, we need to migrate faves into a new table.
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// See section 7 here: https://www.sqlite.org/lang_altertable.html
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return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
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// Remove any duplicate faves that were created before constraints.
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// We need to ensure that we don't just delete all faves that are
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// duplicates--we should keep the original, non-duplicate fave.
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// So, produced query will look something like this:
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//
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// DELETE FROM "status_faves"
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// WHERE id IN (
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// WITH cte AS (
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// SELECT
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// "id",
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// ROW_NUMBER() OVER(
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// PARTITION BY "account_id", "status_id"
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// ORDER BY "account_id", "status_id"
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// ) AS "row_number"
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// FROM status_faves
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// )
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// SELECT "id" FROM cte
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// WHERE "row_number" > 1
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// )
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//
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// The above query only deletes status_faves with ids that are
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// in the subquery. The subquery selects the IDs of all duplicate
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// status faves past the first one, where 'duplicate' means 'has
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// the same account id and status id'.
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overQ := tx.NewRaw(
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"PARTITION BY ?, ? ORDER BY ?, ?",
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bun.Ident("account_id"),
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bun.Ident("status_id"),
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bun.Ident("account_id"),
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bun.Ident("status_id"),
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)
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rowNumberQ := tx.NewRaw(
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"SELECT ?, ROW_NUMBER() OVER(?) AS ? FROM status_faves",
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bun.Ident("id"),
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overQ,
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bun.Ident("row_number"),
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)
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inQ := tx.NewRaw(
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"WITH cte AS (?) SELECT ? FROM cte WHERE ? > 1",
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rowNumberQ,
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bun.Ident("id"),
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bun.Ident("row_number"),
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)
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if _, err := tx.
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NewDelete().
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Table("status_faves").
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Where("id IN (?)", inQ).
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Exec(ctx); err != nil {
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return err
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}
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// Create the new faves table.
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if _, err := tx.
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NewCreateTable().
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ModelTableExpr("new_status_faves").
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Model(>smodel.StatusFave{}).
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Exec(ctx); err != nil {
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return err
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}
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// Specify columns explicitly to
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// avoid any Postgres shenanigans.
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columns := []string{
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"id",
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"created_at",
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"updated_at",
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"account_id",
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"target_account_id",
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"status_id",
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"uri",
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}
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// Copy remaining faves to the new table.
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if _, err := tx.
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NewInsert().
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Table("new_status_faves").
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Table("status_faves").
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Column(columns...).
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Exec(ctx); err != nil {
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return err
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}
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// Drop the old table.
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if _, err := tx.
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NewDropTable().
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Table("status_faves").
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Exec(ctx); err != nil {
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return err
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}
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// Rename new table to old table.
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if _, err := tx.
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ExecContext(
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ctx,
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"ALTER TABLE ? RENAME TO ?",
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bun.Ident("new_status_faves"),
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bun.Ident("status_faves"),
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); err != nil {
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return err
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}
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// Add indexes to the new table.
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for index, columns := range map[string][]string{
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"status_faves_id_idx": {"id"},
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"status_faves_account_id_idx": {"account_id"},
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"status_faves_status_id_idx": {"status_id"},
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} {
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if _, err := tx.
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NewCreateIndex().
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Table("status_faves").
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Index(index).
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Column(columns...).
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Exec(ctx); err != nil {
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return err
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}
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}
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return nil
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})
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}
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down := func(ctx context.Context, db *bun.DB) error {
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return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
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return nil
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})
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}
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if err := Migrations.Register(up, down); err != nil {
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panic(err)
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}
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}
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