jsilva · August 29, 2015 14:09
diff --git a/BoatRepository.scala b/BoatRepository.scala
 // The "classic" Repository interface
 trait BoatRepository {
    def find(uid: String): Future[Boat]
 }
diff --git a/Database.scala b/Database.scala
 // an abstract declaration of DB instance for the repository
 trait Database {
    protected def db: DB
 }
diff --git a/MongoDbBoatDao.scala b/MongoDbBoatDao.scala
 // For example use a MongoDb instance dao for insert Boat
 trait MongoDbBoatDao extends BoatRepository with Database { 
    def find(uid: String) = db.find(uid)  // here code the Dao implementation
 }

 // Here we construct the Scala object Dao using trait mixin
 object MongoDbBoatDao extends MongoDbBoatDao with ProdDatabase
diff --git a/MongoDbBoatDaoTest.scala b/MongoDbBoatDaoTest.scala
 // with this example test we can show how overload ProdDatabase instance
 class MongoDbBoatDaoTest extends FunSuite {
    val connection: DB = {
        // create a DB instance test
    }

 	// override db with test db instance to perform testing
    trait TestDbInjection extends Database { val db = connection }
    object UnderTestDao extends MongoDbBoatDao with TestDbInjection

    test("should insert boat") {
        UnderTestDao.insert(...)
        // test something ...
    }
 }
diff --git a/ProdDatabase.scala b/ProdDatabase.scala
 // This trait produce a concrete implementation of DB instance to inject into Dao
 trait ProdDatabase extends Database {
    protected val db = FactoryDb.init()  // a example way of retrieve a DB instance
 }
	// The "classic" Repository interface
	trait BoatRepository {
	def find(uid: String): Future[Boat]
	}
	// an abstract declaration of DB instance for the repository
	trait Database {
	protected def db: DB
	}
	// For example use a MongoDb instance dao for insert Boat
	trait MongoDbBoatDao extends BoatRepository with Database {
	def find(uid: String) = db.find(uid) // here code the Dao implementation
	}

	// Here we construct the Scala object Dao using trait mixin
	object MongoDbBoatDao extends MongoDbBoatDao with ProdDatabase
	// with this example test we can show how overload ProdDatabase instance
	class MongoDbBoatDaoTest extends FunSuite {
	val connection: DB = {
	// create a DB instance test
	}

	// override db with test db instance to perform testing
	trait TestDbInjection extends Database { val db = connection }
	object UnderTestDao extends MongoDbBoatDao with TestDbInjection

	test("should insert boat") {
	UnderTestDao.insert(...)
	// test something ...
	}
	}
	// This trait produce a concrete implementation of DB instance to inject into Dao
	trait ProdDatabase extends Database {
	protected val db = FactoryDb.init() // a example way of retrieve a DB instance
	}