docs: def pw_converter(handler, flt):
      """Convert column name to filter."""
      import peewee as pw
  
      if isinstance(flt, Filter):
          return flt
  
      model = handler.model
      field = getattr(model, flt)
  
      if isinstance(field, pw.BooleanField):
          return PWBoolFilter(flt)
  
      if field.choices:
          choices = [(Filter.default, '---')] + list(field.choices)
          return PWChoiceFilter(flt, choices=choices)
  
      return PWFilter(flt)