NHibernate: How to-reconfigure mappings at runtime?

Question

Let's get this out of the way first: I know that SessionFactory is immutable - I'm trying to change the Configuration at runtime and regenerate ISessionFactory.

Specifically, I have a Customer mapped that will have some fields added to its dynamic-component node at runtime. I would like to do something like this

var newSessionFactory = previousConfiguration
  .RemoveClassMapping(typeof(Customer))
  .AddXmlString(newMappingForCustomer)
  .BuildSessionFactory();

However, I don't see any obvious way to remove a mapping, is there anything I can do short of regenerating the entire Configuration?

Answer 1

It's not possible. You'll have to regenerate the Configuration.

My initial suggestion would be that you choose a different strategy for your model.

However, if you are determined to go with this :-), you can:

• Create a "partial" Configuration (that does not include Customer)
• Serialize it to a MemoryStream
• Add the "base" Customer mapping, if needed
• Create the temporary SessionFactory
• Retrieve whatever information you need to map Customer
• Deserialize your saved Configuration
• Add the Customer mapping and create your final SessionFactory