code: def forwards(self, orm):
          "Write your forwards methods here."
          fields = orm['avocado.DataField'].objects.filter(app_name='variants',
              model_name='evs', field_name__in=('all_maf', 'aa_maf', 'ea_maf'))
          for f in fields:
              f.field_name = f.field_name.replace('maf', 'af')
              f.save(f forwards(self, orm):
          "Write your forwards methods here."
          fields = orm['avocado.DataField'].objects.filter(app_name='variants',
              model_name='evs', field_name__in=('all_maf', 'aa_maf', 'ea_maf'))
          for f in fields:
              f.field_name = f.field_name.replace('maf', 'af')
              f.save()
docs: Write your forwards methods here.