not null fields with single table inheritance

[mocha]

Does any one have a neat solution to handling required fields over a single table inheritance strategy?  if I make the column nullable false, then i get the column set to NOT NULL.  if I use @NotNull then the model doesn't seem to get validated.  Anyway to get the model validated, but avoid a not null DB column?

[mocha]

solved my own problem... @NotNull validator was doing exactly what I wanted, just that my test cases were expecting a different exception.