On line 11 I am getting

type inference failed not enough information fun<T: Any!> error( exception: Throwable!): Single<T!>!

pls, replace first string and database[id] fo val elt = database[id] ?: return Single.error(Throwable(“Not found”))

thank you. Will keep that in mind. The main problem is it's not compiling in flatmap returning

return@flatMap Single.error(Throwable(""))

giving error

Is it fine with

Single.error<User>

and/or

Single.just(database[0]!!)

?

now working with

Single.error<User>

I don’t understand, why do i need use flatmap in this example

Hi see the new question