This would solve your error.
class MyModel:
def db_update(self, field_name, value):
self.db(self.db.t_empire.id==self.record.id
).update(**{field_name:value})
However since you have the record in self.record. You can just do.
def update(self, field_name, value):
self.record.update_record(**{field_name:value})
The reason you have to do this is to pass the value of the variable
fieldname as a keyword argument. I recommend you get to know at least a
little bit of Python otherwise you will lose a lot of time with trial and
error. It's worth the time investment to learn to use your tools right.
PS:. I do question the need your MyModel class is satisfying.
--
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