How to inject data class in android with dagger where data class parameter have no default value?

Question

My data class like:

    data class Animal(var id:Int = 2)  {
    }

My Provides method in module class like:

    @Provides
    @Singleton
    fun provide(): Animal {
        return Animal()
    }

I want to avoid default value in data class parameter.

Answer 1

as per documentation while using data class primary constructor, it's must to pass at-least one parameter. remove data from class, after removing data there is no need to pass at-least single parameter to Constructor . hope this may helps you.

    class Animal()  {
           var id:Int = 2
    } 


@Provides
    @Singleton
    fun provide(): Animal {
        return Animal()
    }

Answer 2

Just keep the fields nullable and assign them as null.

Class:

data class Animal @Inject constructor(
    var id: Int? = null
) { }

Module:

@Provides
fun providesAnima(): Animal = Animal()

Answer 3

To avoid default value in parameter of data class you have to make it optional. In kotlin to make optional you have to use ? with the parameter.

data class Animal(var id:Int?=null)  {
}