如何使用Macwire注入特征

Question

我有Scala特質

trait UserRepository {
  def findByEmail(email: String): User
}

我想將其注入MacWire服務中

class AccountService(){
  val userRepo = wire[UserRepository]
}

然后在測試或課程中使用它

class AccountServiceSpec {
  val userRepo = new UserRepositoryImpl()
  val accountSvc = new AccountService() //<--not manually injecting repo in service constructor
}

但是我在服務類中遇到了編譯錯誤

找不到accounts.repository.UserRepository的公共構造函數或伴隨對象

Answer 1

您可以嘗試將userRepo轉換為類參數，該參數允許macwire自動提供其用於服務的值：

import com.softwaremill.macwire._

case class User(email: String)

trait UserRepository {
  def findByEmail(email: String): User
}

class AccountService(val userRepo: UserRepository)

class UserRepositoryImpl extends UserRepository{
  def findByEmail(email: String): User = new User(email)
}

class AccountServiceSpec {
  val userRepo = new UserRepositoryImpl()
  val accountSvc = wire[AccountService] //<--not manually injecting repo in service constructor
}