If I want a planet record to point to another planet record?
If I use the following...
db.define_table('planet',
Field('radius', 'integer'),
Field('previous_planet', db.planet, requires=IS_NULL_OR
(IS_IN_DB(db,db.planet.id,'%(id)s'))))
I get KeyError: 'planet' which makes sense as planet doesn't exist at
the point I 'try' and refer to it.
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