def get_row_str_fields(self, obj, row=None):
str_fields = super().get_row_str_fields(obj, row)
if str_fields is None:
str_fields = {}
# Add formatted display of virtual field.
is_plural = pluralize(row['exists_days'], arg='days')
str_fields['exists_days'] = '{} {}'.format(row['exists_days'], 'day' if is_plural == '' else is_plural)
return str_fields
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