code: def get_unique_fields(cls):
          
          unique_fields = []
  
          for fname, field in cls.__dict__.items():
              if isinstance(field, models.fields.Field):
                  if getattr(field,'unique',False):
                      try:
                          field.unique = False
                      except AttributeError:
                          # newer Django defines unique as a property
                          # that uses _unique to store data.  We're
                          # jumping over the fence by setting _unique,
                          # so this sucks, but this happens early enough
                          # to be safe.
                          field._unique = False
                      unique_fields.append(fname)
          return unique_fields
docs: Return a list of fields with "unique" attribute, which needs to
          be augmented by the language.