Swift Combine: How to create a single publisher from a list of publishers?

Question

Using Apple\'s new Combine framework I want to make multiple requests from each element in a list. Then I want a single result from a reduction of all the the responses. Basical

Answer 1

Try something like this if order is important:

func createIngredients(ingredients: [Ingredient]) -> AnyPublisher<[CreateIngredientMutation.Data], Error> {
    // first attempt
    let results = ingredients
            .map(createIngredient)
    // results = [AnyPublisher]

    var resultPublisher = Empty

    for result in results {
        resultPublisher = resultPublisher.append(result)
    }

    return resultPublisher.collect()
}