implemented table join

app/controllers/HomeController.scala

@@ -11,23 +11,23 @@ import com.example.services.LibraryService
 import play.api.libs.json.Json
 
 @Singleton
-class HomeController @Inject() (userDAO: UserDAO, carDAO: CarDAO, libraryService: LibraryService, cc: ControllerComponents)
-                               (implicit ec: ExecutionContext)
-  extends AbstractController(cc) {
+class HomeController @Inject() (
+    userDAO: UserDAO,
+    carDAO: CarDAO,
+    libraryService: LibraryService,
+    cc: ControllerComponents
+)(implicit ec: ExecutionContext)
+    extends AbstractController(cc) {
 
   def index = Action.async { implicit request =>
-    userDAO.all.map { users =>
-      Ok(views.html.index(users))
-    }
+    userDAO.all.map { users => Ok(views.html.index(users)) }
   }
 
   def cars = Action.async { implicit request =>
-    carDAO.all.map { cars =>
-      Ok(views.html.cars(cars))
-    }
+    carDAO.all.map { cars => Ok(views.html.cars(cars)) }
   }
 
-  def book = Action.async{
+  def book = Action.async {
     // libraryService.findBookById(1).map(e => Ok(Json.toJson(e)))
     // libraryService.insertBookAndAuthor(Book("new book"), Author(2, "Some retard"))
 
@@ -36,4 +36,10 @@ class HomeController @Inject() (userDAO: UserDAO, carDAO: CarDAO, libraryService
     } yield (Ok(Json.toJson(maybeBook)))
   }
 
+  def authors(bookId: Long) = Action.async { implicit request =>
+    libraryService.getAuthorsForBook(bookId).map( t => {
+      Ok(Json.toJson(t))
+    })
+  }
+
 }

conf/routes

@@ -6,6 +6,7 @@
 GET     /                           controllers.HomeController.index
 GET     /cars                       controllers.HomeController.cars
 GET     /book                       controllers.HomeController.book
+GET     /authors/:bookId            controllers.HomeController.authors(bookId: Long)
 
 # Map static resources from the /public folder to the /assets URL path
 GET     /assets/*file               controllers.Assets.versioned(path="/public", file: Asset)

logs/application.log

@@ -1,31 +1,28 @@
-2020-05-14 01:04:22,774 [INFO] from play.api.http.EnabledFilters in play-dev-mode-akka.actor.default-dispatcher-7 - Enabled Filters (see <https://www.playframework.com/documentation/latest/Filters>):
+2020-05-16 21:21:04,771 [INFO] from play.api.http.EnabledFilters in play-dev-mode-akka.actor.default-dispatcher-5 - Enabled Filters (see <https://www.playframework.com/documentation/latest/Filters>):
 
     play.filters.csrf.CSRFFilter
     play.filters.headers.SecurityHeadersFilter
     play.filters.hosts.AllowedHostsFilter
 
-2020-05-14 01:04:22,780 [INFO] from play.api.Play in play-dev-mode-akka.actor.default-dispatcher-7 - Application started (Dev) (no global state)
-2020-05-14 01:04:41,915 [INFO] from play.api.http.EnabledFilters in play-dev-mode-akka.actor.default-dispatcher-7 - Enabled Filters (see <https://www.playframework.com/documentation/latest/Filters>):
+2020-05-16 21:21:04,777 [INFO] from play.api.Play in play-dev-mode-akka.actor.default-dispatcher-5 - Application started (Dev) (no global state)
+2020-05-16 21:21:05,234 [DEBUG] from slick.jdbc.JdbcBackend.statement in myapp.database-1 - Preparing statement: select x2."ID", x2."NAME", x3.x4, x3.x5, x3.x6, x3.x7 from (select "ID" as x4, "AUTHOR_ID" as x6, "TITLE" as x5, "CREATED_AT" as x7 from "BOOKS" where "ID" = 2 limit 1) x3, "AUTHORS" x2 where x2."ID" = x3.x6
+2020-05-16 21:21:09,910 [DEBUG] from slick.jdbc.JdbcBackend.statement in myapp.database-2 - Preparing statement: select x2."ID", x2."NAME", x3.x4, x3.x5, x3.x6, x3.x7 from (select "ID" as x4, "AUTHOR_ID" as x6, "TITLE" as x5, "CREATED_AT" as x7 from "BOOKS" where "ID" = 1 limit 1) x3, "AUTHORS" x2 where x2."ID" = x3.x6
+2020-05-16 21:26:25,801 [INFO] from play.api.http.EnabledFilters in play-dev-mode-akka.actor.default-dispatcher-7 - Enabled Filters (see <https://www.playframework.com/documentation/latest/Filters>):
 
     play.filters.csrf.CSRFFilter
     play.filters.headers.SecurityHeadersFilter
     play.filters.hosts.AllowedHostsFilter
 
-2020-05-14 01:04:41,917 [INFO] from play.api.Play in play-dev-mode-akka.actor.default-dispatcher-7 - Application started (Dev) (no global state)
-2020-05-14 01:04:46,364 [INFO] from play.api.http.EnabledFilters in play-dev-mode-akka.actor.default-dispatcher-7 - Enabled Filters (see <https://www.playframework.com/documentation/latest/Filters>):
+2020-05-16 21:26:25,804 [INFO] from play.api.Play in play-dev-mode-akka.actor.default-dispatcher-7 - Application started (Dev) (no global state)
+2020-05-16 21:26:25,894 [DEBUG] from slick.jdbc.JdbcBackend.statement in myapp.database-1 - Preparing statement: select x2."ID", x2."NAME", x3."ID", x3."TITLE", x3."AUTHOR_ID", x3."CREATED_AT" from "AUTHORS" x2, "BOOKS" x3 where (x3."ID" = 1) and (x2."ID" = x3."AUTHOR_ID")
+2020-05-16 21:29:57,361 [INFO] from play.api.internal.libs.concurrent.CoordinatedShutdownSupport in pool-14-thread-4 - Starting synchronous coordinated shutdown with ServerStoppedReason reason and 35000 milliseconds timeout
+2020-05-16 21:29:57,362 [INFO] from play.core.server.AkkaHttpServer in pool-14-thread-4 - Stopping Akka HTTP server...
+2020-05-16 21:29:57,363 [INFO] from play.core.server.AkkaHttpServer in play-dev-mode-akka.actor.internal-dispatcher-3 - Terminating server binding for /0:0:0:0:0:0:0:0:8080
+2020-05-16 21:29:59,781 [INFO] from play.api.http.EnabledFilters in play-dev-mode-akka.actor.internal-dispatcher-17 - Enabled Filters (see <https://www.playframework.com/documentation/latest/Filters>):
 
     play.filters.csrf.CSRFFilter
     play.filters.headers.SecurityHeadersFilter
     play.filters.hosts.AllowedHostsFilter
 
-2020-05-14 01:04:46,366 [INFO] from play.api.Play in play-dev-mode-akka.actor.default-dispatcher-7 - Application started (Dev) (no global state)
-2020-05-14 10:15:22,298 [INFO] from play.core.server.AkkaHttpServer in play-dev-mode-shutdown-hook-1 - Stopping Akka HTTP server...
-2020-05-14 10:15:22,300 [INFO] from play.core.server.AkkaHttpServer in play-dev-mode-akka.actor.internal-dispatcher-5 - Terminating server binding for /0:0:0:0:0:0:0:0:8080
-2020-05-14 10:15:32,165 [INFO] from play.api.http.EnabledFilters in play-dev-mode-akka.actor.internal-dispatcher-15 - Enabled Filters (see <https://www.playframework.com/documentation/latest/Filters>):
-
-    play.filters.csrf.CSRFFilter
-    play.filters.headers.SecurityHeadersFilter
-    play.filters.hosts.AllowedHostsFilter
-
-2020-05-14 10:15:32,176 [INFO] from play.api.Play in play-dev-mode-akka.actor.internal-dispatcher-15 - Application started (Dev) (no global state)
-2020-05-14 10:15:32,221 [INFO] from play.core.server.AkkaHttpServer in play-dev-mode-akka.actor.internal-dispatcher-18 - Running provided shutdown stop hooks
+2020-05-16 21:29:59,783 [INFO] from play.api.Play in play-dev-mode-akka.actor.internal-dispatcher-17 - Application started (Dev) (no global state)
+2020-05-16 21:29:59,810 [INFO] from play.core.server.AkkaHttpServer in play-dev-mode-akka.actor.internal-dispatcher-19 - Running provided shutdown stop hooks

modules/api/src/main/scala/com/example/models/Library.scala

@@ -3,12 +3,23 @@ package com.example.models
 import play.api.libs.json.Json
 import java.time.Instant
 
-final case class Book(id: Long, title: String, authorId: Long, createdAt: Instant)
+final case class Book(
+    id: Long,
+    title: String,
+    authorId: Long,
+    createdAt: Instant
+)
 final case class NewBook(title: String, authorId: Long)
 final case class BookDTO(title: String, authorId: Long, createdAt: Instant)
 final case class Author(id: Long, name: String)
 final case class NewAuthor(name: String)
 
 object Book {
-    implicit val bookJsonWrite = Json.format[Book]
-}
+  def tupled = (Book.apply _).tupled
+  implicit val bookJsonFormat = Json.format[Book]
+}
+
+object Author {
+  def tupled = (Author.apply _).tupled
+  implicit val authorsJsonFormat = Json.format[Author]
+}

modules/api/src/main/scala/com/example/services/LibraryService.scala

@@ -23,4 +23,6 @@ trait LibraryService {
 
     // Insert a book and an author composing two DBIOs in a transaction
     def insertBookAndAuthor(book: NewBook, author: NewAuthor): Future[(Long, Long)] 
+
+    def getAuthorsForBook(id: Long): Future[Seq[(Author, Book)]]
 }

modules/slick/src/main/scala/com/example/user/slick/dbios/SlickLibraryDbio.scala

@@ -36,6 +36,10 @@ class SlickLibraryDbio extends Tables {
   def insertAuthor2(author: NewAuthor): DBIO[Long] =
     Query.writeAuthors2 += author
 
+  def getAuthorsForBook(bookId: Long): DBIO[Seq[(AuthorsRow, BooksRow)]] = {
+    Query.authorOfBook(bookId).result
+  }
+
   def authorToRow(author: Author) = author.transformInto[AuthorsRow]
   def bookToRow(book: Book) = book.transformInto[BooksRow]
   def authorsRowToAuthor(author: AuthorsRow) = author.transformInto[Author]
@@ -76,16 +80,20 @@ class SlickLibraryDbio extends Tables {
 
     lazy val authorOfBook = (bookId: Long) =>
       for {
-        (authors, books) <- Authors join Books on (_.id === _.authorId) filter {
+        (author, book) <- Authors join
+          Books on (_.id === _.authorId) filter {
           case (authors, books) => books.id === bookId
         }
-      } yield (authors, books)
+      } yield (author, book)
 
     lazy val authorOfBook2 = (bookId: Long) =>
       for {
-        authorId <- Books.filter(_.id === bookId).take(1).map(_.authorId)
-        authors <- Authors filter (_.id === authorId)
-      } yield (authors.name)
+        (authorId, book) <- Books
+          .filter(_.id === bookId)
+          .take(1)
+          .map(b => (b.authorId, b))
+        author <- Authors filter (_.id === authorId)
+      } yield (author, book)
 
     // lazy val authorOfBook3 = (bookId: Long) =>
     //   for {

modules/slick/src/main/scala/com/example/user/slick/services/SlickLibraryService.scala

@@ -16,6 +16,17 @@ class SlickLibraryService @Inject() (
     libraryDbio: SlickLibraryDbio
 )(implicit ec: ExecutionContext)
     extends LibraryService {
+
+    override def getAuthorsForBook(id: Long): Future[Seq[(Author, Book)]] = {
+      db.run{
+        libraryDbio.getAuthorsForBook(id).map(_.map {
+          case (x, y) => {
+            ( libraryDbio.authorsRowToAuthor(x), libraryDbio.booksRowToBooks(y))
+          }
+        })
+      }
+    }
+
   import libraryDbio.profile.api._
 
   // Simple function that returns a book