code: def apply_filters(instance, html, field_name):
      
      try:
          html = apply_pre_filters(instance, html)
  
          # Perform post processing. This does not effect the original 'html'
          html_final = apply_post_filters(instance, html)
      except ValidationError as e:
          if hasattr(e, 'error_list'):
              # The filters can raise a "dump" ValidationError with a single error.
              # However, during post_clean it's expected that the fields are named.
              raise ValidationError({
                  field_name: e.error_list
              })
          raise
  
      return html, html_final
docs: Run all filters for a given HTML snippet.
      Returns the results of the pre-filter and post-filter as tuple.
  
      This function can be called from the :meth:`~django.db.models.Model.full_clean` method in the model.
      That function is called when the form values are assigned.
      For example:
  
      .. code-block:: python
  
          def full_clean(self, *args, **kwargs):
              super(TextItem, self).full_clean(*args, **kwargs)
              self.html, self.html_final = apply_filters(self, self.html, field_name='html')
  
      :type instance: fluent_contents.models.ContentItem
      :raise ValidationError: when one of the filters detects a problem.