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feat(repo): enhance MoveToArchive functionality to handle duplicates and improve error handling

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This commit is contained in:
Nik Afiq 2025-12-11 21:43:50 +09:00
parent c4ac2ed128
commit a0db346ab7
1 changed files with 64 additions and 42 deletions
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94
backend/internal/repo/episode_repo.go
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@ -3,6 +3,7 @@ package repo
import (
"context"
"errors"
"time"
"watch-party-backend/internal/core/episode"
@ -140,69 +141,90 @@ func (r *pgxEpisodeRepo) MoveToArchive(ctx context.Context, ids []int64) (episod
return res, nil
}
requested := make(map[int64]struct{}, len(ids))
for _, id := range ids {
requested[id] = struct{}{}
}
tx, err := r.pool.Begin(ctx)
if err != nil {
return res, err
}
defer func() { _ = tx.Rollback(ctx) }()
// 1) Insert into archive from current (skip duplicates by id)
insRows, err := tx.Query(ctx, `
INSERT INTO current_archive (
id, ep_num, ep_title, season_name, start_time, playback_length, current_ep, date_created
)
// Grab the rows we need to archive.
rows, err := tx.Query(ctx, `
SELECT id, ep_num, ep_title, season_name, start_time, playback_length, current_ep, date_created
FROM current
WHERE id = ANY($1::bigint[])
ON CONFLICT (id) DO NOTHING
RETURNING id
`, ids)
if err != nil {
return res, err
}
for insRows.Next() {
var id int64
if err := insRows.Scan(&id); err != nil {
return res, err
}
res.MovedIDs = append(res.MovedIDs, id)
}
if err := insRows.Err(); err != nil {
defer rows.Close()
for rows.Next() {
var (
id int64
epNum int
epTitle string
seasonName string
startTime string
playback string
currentEp bool
dateCreated time.Time
archivedID int64
inserted bool
)
if err := rows.Scan(&id, &epNum, &epTitle, &seasonName, &startTime, &playback, &currentEp, &dateCreated); err != nil {
return res, err
}
// 2) Delete from current only those actually inserted to archive
if len(res.MovedIDs) > 0 {
delRows, err := tx.Query(ctx, `
DELETE FROM current
WHERE id = ANY($1::bigint[])
// First try to insert with the same id; on conflict, insert with a new id.
err = tx.QueryRow(ctx, `
INSERT INTO current_archive (
id, ep_num, ep_title, season_name, start_time, playback_length, current_ep, date_created
)
VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
ON CONFLICT (id) DO NOTHING
RETURNING id
`, res.MovedIDs)
if err != nil {
`, id, epNum, epTitle, seasonName, startTime, playback, currentEp, dateCreated).Scan(&archivedID)
if err != nil && !errors.Is(err, pgx.ErrNoRows) {
return res, err
}
for delRows.Next() {
var id int64
if err := delRows.Scan(&id); err != nil {
return res, err
if err == nil {
inserted = true
}
res.DeletedIDs = append(res.DeletedIDs, id)
}
if err := delRows.Err(); err != nil {
if !inserted {
if err := tx.QueryRow(ctx, `
INSERT INTO current_archive (
id, ep_num, ep_title, season_name, start_time, playback_length, current_ep, date_created
)
VALUES (nextval(pg_get_serial_sequence('current','id')), $1, $2, $3, $4, $5, $6, $7)
RETURNING id
`, epNum, epTitle, seasonName, startTime, playback, currentEp, dateCreated).Scan(&archivedID); err != nil {
return res, err
}
}
// 3) Compute skipped = requested - moved
sel := make(map[int64]struct{}, len(res.MovedIDs))
for _, id := range res.MovedIDs {
sel[id] = struct{}{}
// Delete from current using the original id.
if _, err := tx.Exec(ctx, `DELETE FROM current WHERE id = $1`, id); err != nil {
return res, err
}
for _, id := range ids {
if _, ok := sel[id]; !ok {
res.MovedIDs = append(res.MovedIDs, id)
res.DeletedIDs = append(res.DeletedIDs, id)
delete(requested, id)
}
if err := rows.Err(); err != nil {
return res, err
}
// Any ids not found are treated as skipped.
for id := range requested {
res.SkippedIDs = append(res.SkippedIDs, id)
}
}
if err := tx.Commit(ctx); err != nil {
return res, err