code: def as_widget(self, widget=None, attrs=None, only_initial=False):
          
          if not widget:
              widget = self.field.widget
  
          if DJANGO_VERSION > (1, 10):
              # so that we can refer to the field when building the rendering context
              widget._field = self.field
              # Make sure that NgWidgetMixin is not already part of the widget's bases so it doesn't get added twice.
              if not isinstance(widget, NgWidgetMixin):
                  widget.__class__ = type(widget.__class__.__name__, (NgWidgetMixin, widget.__class__), {})
          return super(NgBoundField, self).as_widget(widget, attrs, only_initial)
docs: Renders the field.