go-gorm/gorm · error

not support

Error message

not support

What it means

GetIndexes on the base gorm.Migrator is a stub that returns errors.New("not support"). Each dialect driver (MySQL, Postgres, SQLite, SQLServer) is expected to override it; getting this error means the migrator in use did not provide an implementation, so index introspection is unavailable.

Source

Thrown at migrator/migrator.go:1032

	}

	for _, name := range orderedModelNames {
		results = append(results, valuesMap[name].Statement.Dest)
	}
	return
}

// CurrentTable returns current statement's table expression
func (m Migrator) CurrentTable(stmt *gorm.Statement) interface{} {
	if stmt.TableExpr != nil {
		return *stmt.TableExpr
	}
	return clause.Table{Name: stmt.Table}
}

// GetIndexes return Indexes []gorm.Index and execErr error
func (m Migrator) GetIndexes(dst interface{}) ([]gorm.Index, error) {
	return nil, errors.New("not support")
}

// GetTypeAliases return database type aliases
func (m Migrator) GetTypeAliases(databaseTypeName string) []string {
	return nil
}

// TableType return tableType gorm.TableType and execErr error
func (m Migrator) TableType(dst interface{}) (gorm.TableType, error) {
	return nil, errors.New("not support")
}

View on GitHub (pinned to 1d6ce99528)

Solutions

1. Upgrade the dialect driver to a version that implements GetIndexes.
2. Query the dialect's catalog directly (information_schema.statistics / pg_indexes / sqlite_master) with db.Raw.
3. If you maintain the driver, implement GetIndexes on your Migrator.
4. Feature-detect at startup so the tool degrades gracefully instead of failing per call.

Example fix

// before
idxs, err := db.Migrator().GetIndexes(&User{}) // err = "not support"

// after (dialect catalog query)
var rows []struct{ IndexName string }
db.Raw("SELECT indexname AS index_name FROM pg_indexes WHERE tablename = ?", "users").Scan(&rows)

func supportsGetIndexes(m gorm.Migrator) bool {
    _, err := m.GetIndexes(&probeModel{})
    return err == nil || !strings.Contains(err.Error(), "not support")
}

idxs, err := db.Migrator().GetIndexes(&User{})
if err != nil && strings.Contains(err.Error(), "not support") {
    idxs, err = indexesFromCatalog(db, "users") // fallback raw SQL
}
if err != nil { return err }

When it happens

Trigger: Calling db.Migrator().GetIndexes(&User{}) on a driver whose Migrator type does not override GetIndexes (niche/unmaintained drivers, or an old driver version predating the API), or calling it directly on the embedded base Migrator.

Common situations: Using a community driver (clickhouse, odps, luaxia/sqlite forks) that never implemented GetIndexes; upgrading GORM core to a version that added the API faster than the driver did; writing schema-diff tooling that assumes every dialect supports index introspection.

Related errors

• failed to get schema
• failed to unmarshal gob value: %#v
• violates check constraint
• unsupported relationship
• record not found

AI-assisted analysis of go-gorm/gorm@1d6ce99528 (2026-08-15). Data as JSON: /api/errors/a83a1bbe33f45e8a. Report an issue: GitHub.