formField

val route =
  formFields('color, 'age.as[Int]) { (color, age) =>
    complete(s"The color is '$color' and the age ten years ago was ${age - 10}")
  }

// tests:
Post("/", FormData("color" -> "blue", "age" -> "68")) ~> route ~> check {
  responseAs[String] shouldEqual "The color is 'blue' and the age ten years ago was 58"
}

Get("/") ~> Route.seal(route) ~> check {
  status shouldEqual StatusCodes.BadRequest
  responseAs[String] shouldEqual "Request is missing required form field 'color'"
}
val route =
  formField('color) { color =>
    complete(s"The color is '$color'")
  } ~
    formField('id.as[Int]) { id =>
      complete(s"The id is '$id'")
    }

// tests:
Post("/", FormData("color" -> "blue")) ~> route ~> check {
  responseAs[String] shouldEqual "The color is 'blue'"
}

Get("/") ~> Route.seal(route) ~> check {
  status shouldEqual StatusCodes.BadRequest
  responseAs[String] shouldEqual "Request is missing required form field 'color'"
}
val route =
  formFieldMap { fields =>
    def formFieldString(formField: (String, String)): String =
      s"""${formField._1} = '${formField._2}'"""
    complete(s"The form fields are ${fields.map(formFieldString).mkString(", ")}")
  }

// tests:
Post("/", FormData("color" -> "blue", "count" -> "42")) ~> route ~> check {
  responseAs[String] shouldEqual "The form fields are color = 'blue', count = '42'"
}
Post("/", FormData("x" -> "1", "x" -> "5")) ~> route ~> check {
  responseAs[String] shouldEqual "The form fields are x = '5'"
}
val route =
  formFieldMultiMap { fields =>
    complete("There are " +
      s"form fields ${fields.map(x => x._1 + " -> " + x._2.size).mkString(", ")}")
  }

// tests:
Post("/", FormData("color" -> "blue", "count" -> "42")) ~> route ~> check {
  responseAs[String] shouldEqual "There are form fields color -> 1, count -> 1"
}
Post("/", FormData("x" -> "23", "x" -> "4", "x" -> "89")) ~> route ~> check {
  responseAs[String] shouldEqual "There are form fields x -> 3"
}
val route =
  formFieldSeq { fields =>
    def formFieldString(formField: (String, String)): String =
      s"""${formField._1} = '${formField._2}'"""
    complete(s"The form fields are ${fields.map(formFieldString).mkString(", ")}")
  }

// tests:
Post("/", FormData("color" -> "blue", "count" -> "42")) ~> route ~> check {
  responseAs[String] shouldEqual "The form fields are color = 'blue', count = '42'"
}
Post("/", FormData("x" -> "23", "x" -> "4", "x" -> "89")) ~> route ~> check {
  responseAs[String] shouldEqual "The form fields are x = '23', x = '4', x = '89'"
}