fastpastebin/vendor/github.com/pressly/goose/reset.go

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package goose
import (
"database/sql"
"sort"
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"github.com/pkg/errors"
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)
// Reset rolls back all migrations
func Reset(db *sql.DB, dir string) error {
migrations, err := CollectMigrations(dir, minVersion, maxVersion)
if err != nil {
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return errors.Wrap(err, "failed to collect migrations")
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}
statuses, err := dbMigrationsStatus(db)
if err != nil {
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return errors.Wrap(err, "failed to get status of migrations")
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}
sort.Sort(sort.Reverse(migrations))
for _, migration := range migrations {
if !statuses[migration.Version] {
continue
}
if err = migration.Down(db); err != nil {
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return errors.Wrap(err, "failed to db-down")
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}
}
return nil
}
func dbMigrationsStatus(db *sql.DB) (map[int64]bool, error) {
rows, err := GetDialect().dbVersionQuery(db)
if err != nil {
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return map[int64]bool{}, nil
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}
defer rows.Close()
// The most recent record for each migration specifies
// whether it has been applied or rolled back.
result := make(map[int64]bool)
for rows.Next() {
var row MigrationRecord
if err = rows.Scan(&row.VersionID, &row.IsApplied); err != nil {
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return nil, errors.Wrap(err, "failed to scan row")
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}
if _, ok := result[row.VersionID]; ok {
continue
}
result[row.VersionID] = row.IsApplied
}
return result, nil
}