Pure Functional HTTP APIs in Scala/

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Some More Routes

Some More Routes

Learn how to implement the routes for creating a new product and returning all products.

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Creating a new product

Let’s create a new product.

path("products") {
  post {
    entity(as[Product]) { p =>
      complete {
        repo.saveProduct(p)
      }
    }
  }
}
Creating a product

As you can see, the function is basically the same as the one for updating a product, except we’re calling a different function from the repository.

Returning all products

Let’s now take a look at the “return all products” endpoint.

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path("products") {
  get {
    complete {
      val products = for {
        rows <- repo.loadProducts()
        ps <- Future {
          rows.toList.groupBy(_._1).map {
            case (_, cols) => Product.fromDatabase(cols)
          }
        }
      } yield ps
      products.map(_.toList.flatten)
    }
  }
}

This looks more complicated than the other endpoints. So, what exactly are we doing here? Well, first we load the raw product data from the repository (Line 55). After that, we convert it into the proper data model — or into a list of product entities, to be more exact. What is wrong with that approach?

  • Firstly, we are performing operations in memory. This is
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