How can I use a protocol with an associated type as input type for dependency injection?

@sbogutzky

Jun '21

I have this protocol:

protocol RepositoryProtocol {
    associatedtype Item
    func add(item: Item)
    func getAll() -> [Item]
}

and want to use it here:

class MatchDaysViewViewModel {
    private var matchDayRepository: RepositoryProtocol

    init(matchDayRepository: RepositoryProtocol) {
        self.matchDayRepository = matchDayRepository
    }

    func add(matchDay: MatchDay) {
        matchDayRepository.add(item: matchDay)
    }

    func list() -> [MatchDay] {
        return matchDayRepository.getAll()
    }
}

I got this error:

Protocol 'MatchDayRepositoryProtocol' can only be used as a generic constraint because it has Self or associated type requirements

Thanks in advance Simon

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