code: def as_widget(self, widget=None, attrs=None, only_initial=False):
          
          attrs = attrs or {}
          attrs.update(self.form.get_widget_attrs(self))
          if hasattr(self.field, 'widget_css_classes'):
              css_classes = self.field.widget_css_classes
          else:
              css_classes = getattr(self.form, 'widget_css_classes', None)
          if css_classes:
              attrs.update({'class': css_classes})
          widget_classes = self.form.fields[self.name].widget.attrs.get('class', None)
          if widget_classes:
              if attrs.get('class', None):
                  attrs['class'] += ' ' + widget_classes
              else:
                  attrs.update({'class': widget_classes})
          return super(NgBoundField, self).as_widget(widget, attrs, only_initial)
docs: Renders the field.