This is just a quick introduction to the play framework using the Scala programming language.
Introduction
https://www.youtube.com/watch?v=t620S8-cwWg&list=PLBeQxJQNprbhb6kOJS477I_laHQTGgjg8&index=1
Create Project sbt new playframework/play-scala-seed.g8
Enter projdet name scala-example.
HomeController.scala app/controllers/HomeController.scala:
package controllersimport javax.inject._import play.api._import play.api.mvc._import play.api.libs.json._@Singleton class HomeController @Inject (val controllerComponents: ControllerComponents ) extends BaseController { def index Action { implicit request: Request [AnyContent ] => Ok (views.html.index()) } def ping Action { implicit request => Ok ("String works." ) } def anotherOne Action { _ => Ok (Json .obj("Yes" -> true )) } def nameParam String = "world" ) = Action { _ => Ok (Json .obj("hi" -> name)) } def posted Action (parse.json) { implicit request => Ok (Json .obj("received" -> Json .toJson(request.body))) } }
conf/routes:
# An example controller showing a sample home page GET / controllers.HomeController.index GET /ping controllers.HomeController.ping GET /json controllers.HomeController.anotherOne GET /hello/:name controllers.HomeController.nameParam(name:String) POST /post controllers.HomeController.posted # Map static resources from the /public folder to the /assets URL path GET /assets/*file controllers.Assets.versioned(path="/public", file: Asset)
Run :
Test Test with httpie
http 127.0.0.1:9000 http 127.0.0.1:9000/ping http 127.0.0.1:9000/json http 127.0.0.1:9000/hello/vovo http POST 127.0.0.1:9000/post phone="vovo" http POST 127.0.0.1:9000/post < test.json
Data Model Rebuild
https://www.youtube.com/watch?v=XD_X3BMsRhg&list=PLBeQxJQNprbhb6kOJS477I_laHQTGgjg8&index=4
scala-example> rm -rf app/views scala-example> mv app/controllers/HomeController.scala app/controllers/AppController.scala
app/controllers/AppController.scala
package controllersimport javax.inject._import play.api._import play.api.mvc._import play.api.libs.json._@Singleton class AppController @Inject (val controllerComponents: ControllerComponents ) extends BaseController { def index Action { implicit request: Request [AnyContent ] => Ok ("App works!" ) } }
route
GET / controllers.AppController.index
scala-example> http 127.0.0.1:9000
Result:
HTTP/1.1 200 OK Content-Length: 10 Content-Type: text/plain; charset=UTF-8 Date: Sat, 11 Jan 2020 07:36:47 GMT Referrer-Policy: origin-when-cross-origin, strict-origin-when-cross-origin X-Content-Type-Options: nosniff X-Frame-Options: DENY X-Permitted-Cross-Domain-Policies: master-only X-XSS-Protection: 1; mode=block App works!
MongoDB Search keyword mongo and reactivemongo:
libraryDependencies += "org.reactivemongo" %% "play2-reactivemongo" % "0.20.1-play27" play.sbt.routes.RoutesKeys.routesImport += "play.modules.reactivemongo.PathBindables._"
application.conf
play.modules.enabled += "play.modules.reactivemongo.ReactiveMongoModule" mongodb.uri = "mongodb://localhost:27017/scalarest"
Models mkdir app/models touch app/models/Post.scala
Service Layer
https://www.youtube.com/watch?v=_C5IlQgJbTo&list=PLBeQxJQNprbhb6kOJS477I_laHQTGgjg8&index=2
Create two files scala-example> mkdir app/models scala-example> touch app/models/Post.scala scala-example> mkdir app/repositories scala-example> touch app/repositories/PostRepository.scala
API Controller
https://www.youtube.com/watch?v=G6But_7ug9Q&list=PLBeQxJQNprbhb6kOJS477I_laHQTGgjg8&index=3