How to map many-to-many in NHibernate correctly

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How to map many-to-many in NHibernate correctly(notherdev.blogspot.com)

submitted by notherdev(238) 5 months, 25 days ago

Many-to-many relationships exist only at object model level - at database level it is only a concept implemented using two many-to-one relations with intermediate table. We can implement it the same way in our NHibernate-based object model, but we don't want User and Group to have collections of some UserInGroup objects that have no real object-oriented meaning. We do want User to have many Groups and Group to have many Users - as simple as it can be. Fortunately, this is quite common scenario and NHibernate can support it very well with respect to database-level constraints and good practices, but only when mapped and used with care.

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