mongoose-time-machine

Stores and Manages all the differences and versions, any Mongo collection goes through it's lifecycle.

• Based on the popular project mongoose-diff-history

Installation

npm

npm install mongoose-time-machine

Operation

Each update will create a history record with jsonDiff of the change. This helps in tracking all the changes happened to an object from the beginning.

Following will be the structure of the diff history being saved:

diff Collection schema:

_id : mongo id of the diff object
collectionId : Mongo Id of the collection being modified
diff: diff object
user: User who modified
reason: Why the collection is modified
createdAt: When the collection is modified
_v: version

Usage

Use as you would any Mongoose plugin:

const mongoose = require('mongoose'),
      timeMachine = require('mongoose-time-machine'),
      schema = new mongoose.Schema({ ... });
      schema.plugin(timeMachine.plugin, { name: 'SchemaHistory' });

The plugin also has an omit option which accepts either a string or array. This will omit the given keys from history. Follows dot syntax for deeply nested values.

const mongoose = require('mongoose');
const timeMachine = require('mongoose-time-machine');

const schema = new mongoose.Schema({
    someField: String,
    ignoredField: String,
    some: {
        deepField: String
    }
});

schema.plugin(timeMachine.plugin, {
    name: 'MyModelHistory',
    omit: ['ignoredField', 'some.deepField']
});
const mongooseModel = mongoose.model('MyModel', schema);

You can pass in a mongoose adapter to use for your history models as well. This allows for models to be connected to different clusters/collections.

const myAdapter = await mongoose.createConnection(
    `${uri}/${databaseName}?retryWrites=true`,
    {}
);

schema.plugin(timeMachine.plugin, {
    name: 'MyModelHistory',
    adapter: myAdapter
});
const mongooseModel = myAdapter.model('MyModel', schema);

// MyModelHistory model now lives at the same uri/databaseName as the mongooseModel created

Helper Methods

You can get all the histories created for an object using following method:

const expandableFields = ['abc', 'def'];

mongooseModel.getHistories(
    ObjectId,
    expandableFields,
    function (err, histories) {}
);

// or, as a promise
mongooseModel
    .getHistories(ObjectId, expandableFields)
    .then(histories => {})
    .catch(console.error);

If you just want the raw histories return with json diff patches:

mongooseModel.getDiffs(ObjectId, function (err, histories) {});

// or, as a promise
mongooseModel
    .getDiffs(ObjectId)
    .then(histories => {})
    .catch(console.error);

// with optional query parameters:
mongooseModel
    .getDiffs(ObjectId, { select: 'diff user' })
    .then(histories => {})
    .catch(console.error);

You can get an older version of the object using following method:

mongooseModel.getVersion(ObjectId, version, function (err, oldObject) {});

// or, as a promise
mongooseModel
    .getVersion(ObjectId, version)
    .then(oldObject => {})
    .catch(console.error);

You can also use Mongoose query options with getVersion like so:

mongooseModel.getVersion(
    ObjectId,
    version,
    { lean: true },
    function (err, oldObject) {}
);

// or, as a promise
mongooseModel
    .getVersion(ObjectId, version, { lean: true })
    .then(oldObject => {})
    .catch(console.error);

Access History Model

You can access the model's history-model by calling: mongooseModel.history on your attached model

From there you can call custom mongoose queries on the history model:

mongooseModel.history
    .find({ diff: { name: 'foo' } })
    .limit(10)
    .then(oldObject => {})
    .catch(console.error);

Example

The example found here is an express service (documentation here), demonstrating this plugin via an simple employee schema, checkout example directory in this repo.

Contributing

This project is now using Conventional Commit syntax for commit messages, to allow for easier updates in change logs & release notes. Please follow these conventions in your commits.

Test Locally

• Install Docker Desktop
• Run npm run dc:db-up to start local mongoDB on port 27017
• In the console type:
  • mongo
  • then copy paste

    rs.initiate(
      {
        _id : 'rs0',
        members: [
          { _id : 0, host : "mongo1:27017" },
          { _id : 1, host : "mongo2:27017" },
          { _id : 2, host : "mongo3:27017" }
        ]
      }
    )

• You can view the database by connecting to mongodb://localhost:27017,localhost:27018,localhost:27019/tekpub_test?replicaSet=rs0 through mongo compass
• Run test suite with npm run test

Available Commands

• dc:db-up start local db
• dc:db-down stop local db
• dc:db-destroy delete local db
• test run test suite