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1.9 KiB
1.9 KiB
Migrations
How do I write a migration file?
As a template, take one of the existing migration files and modify it, or use the below code snippet:
/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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.
echo "$(date --utc +%Y%m%H%M%S%N | head -c 14)_$(git rev-parse --abbrev-ref HEAD).go"
Rules of thumb
- DON'T DROP TABLES!!!!!!!!
- Don't make something
NOT NULL
if it's likely to already containnull
fields.