mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-23 04:06:39 +00:00
70 lines
2 KiB
Markdown
70 lines
2 KiB
Markdown
# Migrations
|
|
|
|
## How do I write a migration file?
|
|
|
|
[See here](https://bun.uptrace.dev/guide/migrations.html#migration-names)
|
|
|
|
As a template, take one of the existing migration files and modify it, or use the below code snippet:
|
|
|
|
```go
|
|
// GoToSocial
|
|
// Copyright (C) GoToSocial Authors admin@gotosocial.org
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package migrations
|
|
|
|
import (
|
|
"context"
|
|
|
|
"github.com/uptrace/bun"
|
|
)
|
|
|
|
func init() {
|
|
up := func(ctx context.Context, db *bun.DB) error {
|
|
return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
|
|
// your logic here
|
|
return nil
|
|
})
|
|
}
|
|
|
|
down := func(ctx context.Context, db *bun.DB) error {
|
|
return db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
|
|
// your logic here
|
|
return nil
|
|
})
|
|
}
|
|
|
|
if err := Migrations.Register(up, down); err != nil {
|
|
panic(err)
|
|
}
|
|
}
|
|
```
|
|
|
|
## File format
|
|
|
|
Bun requires a very specific format: 14 digits, then letters or underscores.
|
|
|
|
You can use the following bash command on your branch to generate a suitable migration filename.
|
|
|
|
```bash
|
|
echo "$(date --utc +%Y%m%d%H%M%S | head -c 14)_$(git rev-parse --abbrev-ref HEAD).go"
|
|
```
|
|
|
|
## Rules of thumb
|
|
|
|
1. **DON'T DROP TABLES**!!!!!!!!
|
|
2. Don't make something `NOT NULL` if it's likely to already contain `null` fields.
|