rest - How do I get NHibernate to save an entity if I assign it an ID, but generate one otherwise? -

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according rest philosophy, put request should update resource @ url if exists, , create if doesn't exist. in other words, if use following url:

put http://server/item/5

if item exists id of 5, updated. if item doesn't exist id of 5, new item created id of 5.

however, i'm using nhibernate persistence, , mapped ids identity. means no matter value assign id, nhibernate replace own when save new item.

how nhibernate save item id assign it, without changing id mapping assigned?

if use identity, db won't allow enter value.

that said, if db has special syntax allow inserting explicit values in identity fields, can implement own generator, guarantee error prone, hard debug, , not useful. it's possible.

study in https://nhibernate.svn.sourceforge.net/svnroot/nhibernate/trunk/nhibernate/src/nhibernate/id , start creating frankenstein :-)


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