enum ArticleViewSection: SectionModelType {
  case article(ArticleSectionReactor)

  var items: [ArticleViewSection] {
    switch self {
    case let .article(sectionReactor):
      return sectionReactor.currentState.sectionItems
    }
  }
}

import SectionReactor

final class ArticleSectionItem: SectionReactor {
  struct State: SectionReactorState {
    var sectionItems: [ArticleSectionItem]
  }
}

final class ArticleListViewReactor: Reactor {
  struct State {
    var articleSectionReactors: [ArticleSectionReactor]
    var sections: [ArticleViewSection] {
      return self.articleSectionReactors.map(ArticleViewSection.article)
    }
  }

  func transform(state: Observable<State>) -> Observable<State> {
    return state.merge(sections: [
      { $0.articleSectionReactors },
    ])
  }
}