Docker Compose facilitates spinning up a container for the MongoDB database without installing MongoDB locally.

Prerequisites

• Docker Compose installed

Configuration

The following configuration spins up the MongoDB container with the UI tool (Mongo Express).

The connection string for the MongoDB database is mongodb://localhost:27018.

Mongo Express is available at the http://localhost:8082 link. Use the below Basic auth credentials to log in to Mongo Express.

# docker-compose.yml
version: '3.8'
services:
  mongo:
    image: 'mongo:7.0.5'
    ports:
      - 27018:27017
    volumes:
      - my-data:/var/lib/mongodb/data
  mongo-express:
    image: 'mongo-express:1.0.2'
    ports:
      - 8082:8081
    environment:
      ME_CONFIG_BASICAUTH_USERNAME: username
      ME_CONFIG_BASICAUTH_PASSWORD: password
volumes:
  my-data:

Run the following command to spin up the containers.

docker-compose up

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Using cursor-based iteration can be useful when there is a need to iterate (in memory) over all of the documents from a collection and every document is a big object. Every document can be projected to return only specific fields.

const cursor = Model.find()
  .select('/* several fields */')
  .cursor();
for (
  let document = await cursor.next();
  document != null;
  document = await cursor.next()
) {
  // ...
}

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