Legacy module

The legacy module provides 2 ways for dealing with tables with no pk or with composite pk

see 'tests.py module.

OIDModel

Just use legacy.models.OIDModel instead of models.Model

• Tested on a sqlite trac database: success
• Oracle: should work
• Postgres < 8.0: should work
• Postgres 8+: should works with OID-enabled configuration
• MySQL: should not work :-( (no OID support)

CmpPKModel

• Use legacy.models.CmpPKModel instead of models.Model
• put edit in the admin list_display attribute, like this:

    list_display=('edit',  'other_field', ...)

FIXME: save works with force_insert=True option, update doesn't works, delete is deleting too many items