Triggering Action

[asyl]

Is there any chance to trigger the Action without subscribing to State?

For Example:
I have Action saveKey(Key)

enum Action {
  case saveKey(Key)
}

and I want to trigger action case without returning any Mutation case.

func mutate(action: Action) -> Observable<Mutation> {
  switch action {
  case let .saveKey(key):
    userService.appendKey(key)
    return .empty()
  }
}

Should I return .empty() observable? But it doesn't work

[zdnk]

you need to subscribe to it so it is not disposed/deallocated right away.

[asyl]

@zdenektopic you mean it needs to subscribe to Action?

[devxoul]

@asyl,

1. I didn't understand 'triggering the Action without subscribing to State'. Could you please share me some detailed situation?

2. You should always return Observable from mutate(). Returning .empty() is also my preferred way but it would be better to use like:

   return Observable.create { [weak self] in
     self?.userService.appendKey(key)
     return Disposables.create()
   }

[asyl]

@devxoul Thank you.

Scenario

I used ReactorKit and realized that my actions really work when I subscribe to the State.
For example:
I have UI components bound to some action in my Reactor

self.button.rx.tap
  .flatMap { self.textField.rx.text }
  .map { Reactor.Action.appendElement($0) }
  .bind(to: reactor.action)
  .disposed(by: disposeBag)

where Action:

enum Action {
  case appendElement(String)
}

and in mutate(action: Action) function, I have only one Side Effect where I save my element into the disk. But it doesn't work. Even break points don't work unless I create Mutation and State for this case and I subscribe to the State in my View, like this:

reactor.state.map { $0.element }
  .subscribe { print($0) }
  .disposed(by: disposeBag)

After all of that, I can see how break points stop in mutate(action: Action) and function works.

Question

How can I bind my UI components toAction without creating any Mutation & State?

[devxoul]

Ah, I got it. You may want to create a state stream without binding it to the view. Try this:

class MyReactor {
  init(params: MyParameters) {
    self.initialState = State(foo: bar)
    _ = self.state // add this line to create a state immediately
  }
}