+ for property in self.not_null_constraints():
+ # TODO: It is a bit awkward that the mapper configuration allow
+ # directly setting the numeric _id columns. We should get rid of it
+ # in the long run.
+ if hasattr(self, property + '_id') and \
+ getattr(self, property + '_id') is not None:
+ continue
+ if not hasattr(self, property) or getattr(self, property) is None:
+ raise DBUpdateError(self.validation_message % \
+ (property, str(self)))
+
+ @classmethod
+ @session_wrapper
+ def get(cls, primary_key, session = None):
+ '''
+ This is a support function that allows getting an object by its primary
+ key.
+
+ Architecture.get(3[, session])
+
+ instead of the more verbose
+
+ session.query(Architecture).get(3)
+ '''
+ return session.query(cls).get(primary_key)