使用逆关系两次？
我想知道我是否可以对 2 个不同的关系使用相同的逆关系两次？
下面是一个示例：
Trip
起点（一对一关系）MapPoint（逆ReferencedBy）
目的地（一对一关系）MapPoint（逆向ReferencedBy） ReferencedBy)
MapPoint
- ReferencedBy (对多关系) Trip (这里就有问题了，逆如何设置？)
I would like to know if I can use the same inverse relationship twice for 2 different relationships?
Here is an example :
Trip
Origin (to-one relationship) MapPoint (inverse ReferencedBy)
Destination (to-one relationship) MapPoint (inverse ReferencedBy)
MapPoint
- ReferencedBy (to-many relationship) Trip (here is the problem, how to set the inverse ?)
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不，你不能或不应该。我尝试过，但它会造成混乱。
所以 MapPoint 应该有 2 个关系。
按来源引用
ReferencedByDestination
乍一看可能看起来很奇怪。但想一想。这种做法并没有什么问题。
另一种方法是建立从 MapPoint 到起点和终点的一对多关系并放置一个枚举。
这种方法更优雅，但实际上要复杂得多。
另一种方法是有 2 个子实体：出发地和目的地。
这个更优雅，但您仍然需要
在 MapPoint 中使用。
No you can't or shouldn't. I tried and it causes mayhem.
So that MapPoint should have 2 relationship.
ReferencedByOrigin
ReferencedByDestination
It may look strange at first. But think about it. There is nothing wrong with this approach.
Another approach is to have a one to many relationship from MapPoint to Origin and Destination and put an enum.
This approach is more elegant but actually far more complicated.
Another approach is to have 2 subEntities of Origin and Destination.
This one is more elegant but still you will need
in the MapPoint.