Dagger 2 什么注射什么不注射

Question

I've been reading for a few hours but I can't find an answer. What things should I inject and what things not?

I have my LoginViewModel with a few injected dependencies but I'm not sure if I have to inject for example my User data class (among other data classes) or just instantiate it.

LoginViewModel.kt

class LoginViewModel @Inject constructor(
    private val loginRepositoryImpl: LoginRepositoryImpl,
    private val baseApplication: BaseApplication,
    private val networkUtils: NetworkUtils,
    private val sharedPreferences: SharedPreferences) : ViewModel() {

    fun processLogin(username: String, password: String) {
        val user = User(username, password)
        ...
    }
    ...
}

User.kt

data class User (
    @SerializedName("usuario")
    var user: String,
    @SerializedName("clave")
    var password: String = "",
    @SerializedName("nombre")
    var name: String = ""
)

Answer 1

Depends why you are using Dagger. Say you want to test the following code. loginRepositoryImpl could be accessing an authentication service over network so you'd want to provide an alternate implementation. User is just a data class, there is no value in providing a mock implementation.

    fun processLogin(username: String, password: String): Boolean {
        val user = User(username, password)
        val isValidLogin = loginRepositoryImpl.login(user)
        return isValidLogin
        ...
    }

Answer 2

well mate no you don't need to inject your user data and why are you injecting your base application doesn't sound right