nova/Scala-Play-Slick-Demo
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Added more join examples

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nova 2020-06-03 21:45:50 +05:30
parent a960f43cb6
commit 325f03a2c7
1 changed files with 21 additions and 5 deletions
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26
modules/slick/src/main/scala/com/example/user/slick/dbios/SlickLibraryDbio.scala
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@ -95,11 +95,27 @@ class SlickLibraryDbio extends Tables {
author <- Authors filter (_.id === authorId) author <- Authors filter (_.id === authorId)
} yield (author, book) } yield (author, book)
// lazy val authorOfBook3 = (bookId: Long) => lazy val authorOfBook3 = (bookId: Long) =>
// for { for {
// authorId <- bookById(bookId).map(_.map(_.authorId)) (author, book) <- Authors join
// (authors) <- Authors filter (_.id === authorId) Books on (_.id === _.authorId) filter {
// } yield (authors) case (authors, books) => books.id === bookId
} map {
case (authors, books) =>
(authors.id, authors.name).mapTo[Author] -> (
books.title,
books.authorId,
books.createdAt
).mapTo[BookDTO]
}
} yield (author, book)
lazy val authorOfBook4 = (bookId: Long) =>
for {
book <- Books
author <- book.authorsFk
} yield (author, book)
} }
case class BookWithoutId(title: String, authorId: Long) case class BookWithoutId(title: String, authorId: Long)
// def test() = { // def test() = {