let fieldsUpdates = fields
            .compactMap { $0 as? TextFieldViewModel }
            .map { field in

                field.didFinishEditingSubject
                    .asObservable()
                    .withLatestFrom(Observable.combineLatest(field.text.asObservable(), field.isValid.asObservable()))
                    .filter { $1 }
                    .do(onNext: {
                        address.value.update(field.fieldType, with: $0.0)
                        if let copyTo = field.copyTo {
                            address.value.update(copyTo, with: $0.0)
                        }
                    })
                    .mapToVoid()
                    .asDriverOnErrorJustComplete()
            }

        sideEffects = Driver.merge(fieldsUpdates)