如何从 DatabaseConfigProvider 将演化应用于测试数据库

How to apply evolutions to test database from DatabaseConfigProvider

我想考dao (play 2.6.21, play-slick 3.0.3):

@Singleton
class MyDao @Inject()(@NamedDatabase("default") protected val dbConfigProvider: DatabaseConfigProvider)
                             (implicit val sc: ExecutionContext)
  extends HasDatabaseConfigProvider[JdbcProfile] {
  ...

}

我将测试数据库的数据库配置放在测试资源中:

slick.dbs.default {
  profile = "slick.jdbc.PostgresProfile$"
  endpoint = "localhost:12345"
  schema = "my_test_schemma"

  db {
    driver = "org.postgresql.Driver"
    url = "jdbc:postgresql://"${slick.dbs.default.endpoint}"/"${slick.dbs.default.schema}""
  }
}

在测试中,我想应用进化:

class MyDaoSpec extends FlatSpec with GuiceFakeApplicationFactory {

  implicit lazy val app: Application = fakeApplication()

  "dao" should "something" in {

    val conf = app.injector.instanceOf[DatabaseConfigProvider]
    val db = app.injector.instanceOf[Database]
    Evolutions.applyEvolutions(db)

    val dao = app.injector.instanceOf[MyDao]
    //tests...

  }

}

但它给我错误:

Guice configuration errors for instanceOf[Database]:

1) No implementation for play.api.db.Database was bound. while locating play.api.db.Database

那么我如何访问数据库并对其应用进化?

我发现,我需要使用 EvolutionComponents,但不明白如何使用它

我的错误是,我添加了以下依赖项:

libraryDependencies ++= Seq(evolutions, jdbc)

但正确的是:

"com.typesafe.play" %% "play-slick-evolutions" % "3.0.3",

测试没有特别的步骤,就在配置里:

play.evolutions.enabled = true
play.evolutions.autoApply = true