scala - 如何使用 Guice DI 和 Slick 运行 ScalaTest？

Question

不知道怎么配置GuiceApplicationBuilder这样，我就能够加载需要 DatabaseConfigProvider 的 Controller 被注入(inject)。

我想指定一个替代的 postgres 数据库进行测试，或者一个内存数据库(如果可能的话)。

代码

class   User
extends MySpecs
with    OneAppPerTest
{
    override def newAppForTest( testData: TestData ) = new GuiceApplicationBuilder()
        // Somehow bind a database here, I guess?
        .build()

    "A test" should "test" in
    {
        val result = Application.instanceCache[api.controller.User]
            .apply( app )
            .list()( FakeRequest() )

        ...
    }
}

堆栈跟踪

[info] - should return an entity *** FAILED ***
[info]   com.google.inject.ConfigurationException: Guice configuration errors:
[info] 
[info] 1) No implementation for play.api.db.slick.DatabaseConfigProvider was bound.
[info]   while locating play.api.db.slick.DatabaseConfigProvider
[info]     for parameter 1 at api.controller.User.<init>(User.scala:22)
[info]   while locating api.controller.User
[info] 
[info] 1 error
[info]   at com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:1042)
[info]   at com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:1001)
[info]   at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1051)
[info]   at play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:321)
[info]   at play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:316)
[info]   at play.api.Application$$anonfun$instanceCache$1.apply(Application.scala:234)
[info]   at play.api.Application$$anonfun$instanceCache$1.apply(Application.scala:234)
[info]   at play.utils.InlineCache.fresh(InlineCache.scala:69)
[info]   at play.utils.InlineCache.apply(InlineCache.scala:55)
[info]   ...

Answer 1

您需要将配置添加到您的 GuiceApplicationBuilder() ，那么一切都应该由 Play Framework 自动处理。这样的事情应该会有所帮助:

val app = new GuiceApplicationBuilder()
        .configure(
            Configuration.from(
                Map(
                    "slick.dbs.YOURDBNAME.driver" -> "slick.driver.H2Driver$",
                    "slick.dbs.YOURDBNAME.db.driver" -> "org.h2.Driver",
                    "slick.dbs.YOURDBNAME.db.url" -> "jdbc:h2:mem:",

                    "slick.dbs.default.driver" -> "slick.driver.MySQLDriver$",
                    "slick.dbs.default.db.driver" -> "com.mysql.jdbc.Driver"
                )
            )
        )
        .in(Mode.Test)
        .build()