# mongodb_duplicates

## Install

- Prerequisites:
  - Go SDK 1.22+
  - The URL and credentials to a working MongoDB server
- Optional: `make lint` to verify code
- `make`
- `make install`

## Use

A CLI command to find duplicate values in a MongoDB collection.

1. In your working directory, create a `.env` file based on the example provided
   in [example.env](https://code.osinet.fr/fgm/mongodb_duplicates/raw/main/example.env)
2. Install the `envrun` command to load environment variables from that file:
  - `go install github.com/fgm/envrun@latest`
3. Adjuster your `.env`. For the first check, configure it for an empty collection
  in an empty database:
   - MONGODB_URL: default = `mongodb://localhost:27017`
   - MONGODB_DB: default = `test`
   - MONGODB_COLLECTION: default = `test`
   - MONGODB_FIELD: the duplicate field. Default = `email`
3. Run the command in read-only mode
   - `$ envrun go run ./docs/osinet/cmd/duplicates`
   - it should not display anything since the collection is empty
4. Re-run the command with seed generation. The seed data will remain in the collection.
   - `$ envrun go run ./docs/osinet/cmd/duplicates -command seed`
   - `user1@example.com: 3`
   - `user2@example.com: 2`
   - Resultat show show 3 duplicates of user1 and 2 of user2.
5. Now adjust configuration for the actual collection you want to check.
6. Run the command in read-only mode
  - `$ envrun go run ./docs/osinet/cmd/duplicates`
  - It will give you the values of the field for which duplicates exist,
    and the document count for that value

## License

Licensed under the Apache 2.0 license.