Failable actions about action HOT 2 CLOSED

Hey, great question! This is really tricky, since the issue isn't with the fallibility as much as it is with Swift's initializer requirements. The problem is that you're (probably?) referring to someBooleanExpression as a reference to self from within the closure, which is against Swift's rules.

An easy way around this is to make cancelAction an implicitly unwrapped optional:

var cancelAction: CocoaAction!

And it should be fine.

Let me know if that works, if I can clarify anything, or if I misunderstood the question. Good luck!

from action.

@philipengberg I think you can also use a lazy variable:

 class SomeClass {

    lazy var cancelAction: CocoaAction = CocoaAction {
      if self.someBooleanExpression {
          return failWith(CancelError.UnsavedChanges)
       }
       return just()
   }()

   ...
}

from action.