See e.g. https://groups.google.com/d/topic/liftweb/1WizPeI8C4o/discussion -- if you load a OneToMany from the database and call delete_!, the MappedOneToMany's children won't be deleted (even if you mixed in Cascade) because objects are lazily initialized. Initialize MappedOneToMany and MappedManyToMany when running reflection to discover MappedFields.
(In [[r:f51d88425dba92c37b1b6463b408bf633fb5843c]]) Fix #1018
(In [[r:2816e53c3158dddbd0f8ef93f6c825a147f78a25]]) Fix #1018
Imported from Assembla: http://www.assembla.com/spaces/liftweb/tickets/1018