@reactioncommerce/db-version-check

An NPM package that provides migrations for use with the @reactioncommerce/migrator CLI tool should use this package to check whether data is at the correct version before running any database commands.

Usage

This package exports only one function: doesDatabaseVersionMatch.

import doesDatabaseVersionMatch from "@reactioncommerce/db-version-check";

const ok = await doesDatabaseVersionMatch({
  // `db` is a Db instance from the `mongodb` NPM package,
  // such as what is returned when you do `client.db()`
  db,
  // These must match one of the namespaces and versions
  // your package exports in the `migrations` named export
  expectedVersion: 2,
  namespace: "my-package-name",
  // Defines what to do if no current version is found for this track in
  // the database. By default, the check will fail. That is, we will assume
  // that some data must need to be migrated. If you have a way of checking
  // whether it's an empty database or confirming that no migrations are
  // needed, you can do that and pass `true` here. Then the check will
  // succeed and the current version for the track will be set to
  // `expectedVersion`. Alternatively, pass a function that returns
  // a Promise that returns `true` or `false`. This way you can avoid
  // database lookups unless a decision is necessary.
  async setToExpectedIfMissing() {
    const anyAccount = await db.collection("Accounts").findOne();
    // If there are no accounts, it's probably a brand new database
    // so we can assume all our data will be at the latest version
    // and mark it as such in the database.
    return !anyAccount;
  }
});

if (!ok) {
  throw new Error('Database needs migrating. The "my-package-name" namespace must be at version 2.');
}

Commit Messages

To ensure that all contributors follow the correct message convention, each time you commit your message will be validated with the commitlint package, enabled by the husky Git hooks manager.

Publication to NPM

The @reactioncommerce/db-version-check package is automatically published by CI when commits are merged or pushed to the trunk branch.

Developer Certificate of Origin

We use the Developer Certificate of Origin (DCO) in lieu of a Contributor License Agreement for all contributions to Reaction Commerce open source projects. We request that contributors agree to the terms of the DCO and indicate that agreement by signing-off all commits made to Reaction Commerce projects by adding a line with your name and email address to every Git commit message contributed:

Signed-off-by: Jane Doe <[email protected]>

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License

Copyright 2020 Reaction Commerce

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and limitations under the License.