I am attempting to setup a multiplicity aggregation but not sure how I would accomplish this in the mappings.

Consider the following entities



ContentItemBehavior encapsulates common behavior of tagging, such as adding a tag, removing a tag and housing the collection of tags for the IContentItem.

The problem I am having is how to map the IList<Tag> collection within the Document and Image entities. Would I map the collection as the following:



Also, the collection would be Bidirectional so on that note, in the Tag mapping file can I refer to the entity by the interface, or do I have to use the concrete type on the other end of the collection? like so:



I'm not sure if I can use interfaces to reference entities like that. If not, how would I accomplish this? I am trying to favor aggregation over inheritance. I suppose I would have to map ContentItemBehavior?

Thank you!

Sean

Have you tried mapping your ContentItemBehavior as a component? Don't know if it would work without some additions:

i changed a little how the tags/content items are accessed. It made more sense within the domain, and for nhibernate.

Now whenever tags are used, all access will be performed through the Tag which will maintain the association. ContentItem will only have a reference to IList<Tag>.

Although this still creates a problem because on the Tag end, there is no way for me to tell what the ContentItem type is. ContentItem can be a Document, Link, Image etc..

I suppose I would have to use a discriminator and a many-to-many on both ends?