It's really not, when you have an ORM, eg with Rails (point #3). Automatic conversion between singular and plural can be a real problem, so just eliminate the

It's really not, when you have an ORM, eg with Rails (point #3). Automatic conversion between singular and plural can be a real problem, so just eliminate the problem and stick with singular throughout, so your object names match table names. Unless your object names are plural too, though that seems unintuitive. And then you'd still have problem #4.