Question

我有Scala特质

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

我想将此注入MacWire服务

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

然后在测试或课程中使用它

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

但我在服务类

中遇到编译错误

无法找到公共构造函数或配对对象 accounts.repository.UserRepository

Answer 1

您可以尝试将userRepo转换为类参数，以允许macwire自动为服务提供其值：

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
}

如何用macwire注入特征

1 个答案: