mongo4cats

MongoDB Java client wrapper compatible with Cats-Effect ans Fs2. Available for Scala 2.12, 2.13 and 3.1.

Documentation is available on the mongo4cats microsite.

Dependencies

Add this to your build.sbt (depends on cats-effect and FS2):

libraryDependencies += "io.github.kirill5k" %% "mongo4cats-core" % "<version>"
libraryDependencies += "io.github.kirill5k" %% "mongo4cats-circe" % "<version>"// circe support
libraryDependencies += "io.github.kirill5k" %% "mongo4cats-embedded" % "<version>" // embedded-mongodb

Quick start

import cats.effect.{IO, IOApp}
import mongo4cats.client.MongoClient
import mongo4cats.collection.operations.Filter
import mongo4cats.bson.Document

object Quickstart extends IOApp.Simple {

  override val run: IO[Unit] =
    MongoClient.fromConnectionString[IO]("mongodb://localhost:27017").use { client =>
      for {
        db   <- client.getDatabase("testdb")
        coll <- db.getCollection("docs")
        _    <- coll.insertMany((0 to 100).map(i => Document("name" -> s"doc-$i", "index" -> i)))
        docs <- coll.find
          .filter(Filter.gte("index", 10) && Filter.regex("name", "doc-[1-9]0"))
          .sortByDesc("name")
          .limit(5)
          .all
        _ <- IO.println(docs)
      } yield ()
    }
}

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