code: def preprocess(self):
          
          super(MambuLoan,self).preprocess()
  
          try:
              self['notes'] = strip_tags(self['notes'])
          except KeyError:
              pass
docs: Preprocessing.
  
          Each active custom field is given a 'name' key that holds the field
          name, and for each keyed name, the value of the custom field is
          assigned.
  
          Notes on the group get some html tags removed.