[web2py] Defining db.py for the first time problem (db references possible?)

[zsouthboy]

Problem: I don't see how to specify multiple tables with table
references to each other. I can't simply define the relationship,
because the DAL hasn't created a table yet to reference. But I can't
create the table(s) because they reference tables that also don't
exist yet. Catch 22. Besides manually creating the tables (which I
believe prevents me from using the wonderful DAL), what do I do?

Example:
db.define_table('image',
   Field('image', 'upload'),
   Field('date', 'datetime'),
   Field('title', 'string'),
   Field('description', 'string'),
   Field('postid', 'reference post'),
   Field('owner', 'reference person'),
   Field('views', 'integer'),
   Field('published', 'boolean'))

db.define_table('post',
   Field('title', 'string'),
   Field('data', 'text'),
   Field('date', 'datetime'),
   Field('owner', 'reference person'),
   Field('views', 'integer'),
   Field('published', 'boolean'))

db.define_table('file',
   Field('file', 'upload'),
   Field('date', 'datetime'),
   Field('owner', 'reference person'),
   Field('views', 'integer'),
   Field('published', 'boolean'))

db.define_table('comment',
   Field('name', 'string'),
   Field('person', 'reference person'),
   Field('date', 'datetime'),
   Field('data', 'text'),
   Field('postid', 'reference post'),
   Field('fileid', 'reference file'),
   Field('imageid', 'reference image'),
   Field('published', 'boolean'))

db.define_table('person',
   Field('username', 'string'),
   Field('password', 'password'),
   Field('description', 'text'),
   Field('email', 'string'),
   Field('creation_date', 'datetime'),
   Field('last_login', 'datetime'),
   Field('image', 'reference image'))

This fails because the first table defined references tables are are
defined afterwards. (which in turn reference other tables that aren't
defined yet)