How do I seed a mongo database using docker-compose?

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I do this using another docker container whose only purpose is to seed mongo, then exit. I suspect this is the same idea as ebaxt‘s, but when I was looking for an answer to this, I just wanted to see a quick-and-dirty, yet straightforward, example. So here is mine:

docker-compose.yml

mongodb:
  image: mongo
  ports:
    - "27017:27017"

mongo-seed:
  build: ./mongo-seed
  depends_on:
    - mongodb

# my webserver which uses mongo (not shown in example)
webserver:
  build: ./webserver
  ports:
    - "80:80"
  depends_on:
    - mongodb

mongo-seed/Dockerfile

FROM mongo

COPY init.json /init.json
CMD mongoimport --host mongodb --db reach-engine --collection MyDummyCollection --type json --file /init.json --jsonArray

mongo-seed/init.json

[
  {
    "name": "Joe Smith",
    "email": "[email protected]",
    "age": 40,
    "admin": false
  },
  {
    "name": "Jen Ford",
    "email": "[email protected]",
    "age": 45,
    "admin": true
  }
]

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