如何为多态类定义Repository接口

防爆.

abstract class Source { public String name }

class InternalSource extends Source { public int internalId }
class ExternalSource extends Source { public String contact }

现在我知道我无法定义类似的存储库接口

interface SourceRepo extends Repository<? extends Source, String>{....}

要么

interface SourceRepo extends Repository<Source, String> { ....}

定义简单的普通接口并且有一个implmentation类是唯一的方法吗？

解决方法:

让spring通过’_class’属性将mongo文档与java类映射关联起来会很好.

Mongo文档会像这样

{_id : "xxx", name : "abc", internalId : 123, _class = "...InternalSource" }
{_id : "xxx", name : "abc", contact: "John doe", _class = "...ExternalSource"}