Disabling ActiveRecord "type" column subclassing

Hi! I have a legacy table that has a column named "type" and need to
remove this automatic subclassing by ActiveRecord. The api pages are
vague about this, and I tried

self.inheritance_column = "xtype"

which seemed to get me half-way. In the validate_on_create method, the
value of self.type was my model Class name.

How would you disable this feature?

If you want to check 'type' do self['type']..