NHibernate filter-def for filter named was never used to filter classes nor collections

Posted on One min read

While I was upgrading a project to the latest version of nhibernate I encounter this error

filter-def for filter named UserContext was never used to filter classes nor collections

The code worked perfectly with the older version of nhibernate, but with the new version it does not work. Thanks to my friend Guardian we have found the problem. The problem is due to a filter used only into a formula, the validator of nhibernate configuration, does not find the filter used in any mapping, does not scan formula, and thinks that the filter is never used.

The solution is really simple, in the class that uses the filter, simply add a filter definition that is always verified such as.

1

<filter name="UserContext" condition="Id > 0" />

And everything works ok.

alk.