How to according to the different datasource in one tableview show different cell,and one have a collectionView. and one collectionView have different collectionViewCell

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Short description of the issue:

Expected outcome:

bind success

What actually happens:

crash

Self contained code example that reproduces the issue:

  Now, my tableViewCell have a func to 
return 'RxCollectionViewSectionedReloadDataSource (
configureCell: { (ds, cv, indexPath, element) in

}'

And at UIViewController's 
func dataSource() -> RxTableViewSectionedReloadDataSource<MultipleSectionModel> {
        return RxTableViewSectionedReloadDataSource<MultipleSectionModel>(
            configureCell: { (dataSource, table, indexPath, _) in
                switch dataSource[indexPath] {
                case let .merchant(merchant):
                   ...
                case let .topic(topic):
                    let cell = table.dequeueReusableCell(withIdentifier: TopicInfoCell.idStr()) as! TopicInfoCell
                    cell.name.text = "   " + topic.name + "   "
                    IVManager.dd_FastSetImageWithUrlStr(imageView: cell.mainImg, URLStr: topic.image)
                    cell.num.text = topic.total
                    cell.content.text = topic.introduction

                    var itemAry : [SectionItem] = []
                    for fabricModel in topic.cloths{

                        itemAry.append(.fabric(fabricModel: fabricModel))
                    }

                    Observable.just([MultipleSectionModel.FabricSection(title: "String", items: itemAry)])
                        .bind(to: cell.collectionView.rx.items(dataSource: cell.dataSource()))
                        .disposed(by: self.disposeBag)

                    return cell
                case let .fabric(fabricModel):
                   ...
                default:
                    return UITableViewCell()

                }
        }
        )
    }

// If we can't get a self contained code example that reproduces the issue, there is a big chance we won't be able
// to help you because there is not much we can do.
//
// `Self contained code example` means:
//
// * that we should be able to just run the provided code without changing it.
// * that it will reproduce the issue upon running

RxSwift/RxCocoa/RxBlocking/RxTest version/commit

4.0.0

Platform/Environment

[ * ] iOS
[ ] macOS
[ ] tvOS
[ ] watchOS
[ ] playgrounds

How easy is to reproduce? (chances of successful reproduce after running the self contained code)

[ ] easy, 100% repro
[ * ] sometimes, 10%-100%
[ ] hard, 2% - 10%
[ ] extremely hard, %0 - 2%

Xcode version:

9.1

:warning: Fields below are optional for general issues or in case those questions aren't related to your issue, but filling them out will increase the chances of getting your issue resolved. :warning:

Installation method:

[ * ] CocoaPods
[ ] Carthage
[ ] Git submodules

I have multiple versions of Xcode installed: (so we can know if this is a potential cause of your issue)

[ ] yes (which ones)
[ * ] no

Level of RxSwift knowledge: (this is so we can understand your level of knowledge and formulate the response in an appropriate manner)

[ ] just starting
[ * ] I have a small code base
[ ] I have a significant code base

ReactiveX / RxSwift

How to according to the different datasource in one tableview show different cell,and one have a collectionView. and one collectionView have different collectionViewCell #1520