widgets.py 文件源码

def render_options(self, *args):
        """
        Variation to DAL default, which adds selected_choices to choices
        """
        selected_choices_arg = 1 if VERSION < (1, 10) else 0

        # Filter out None values, not needed for autocomplete
        selected_choices = [c for c in args[selected_choices_arg] if c]

        if self.url:
            all_choices = copy.copy(self.choices)
            self.choices += [ (c, c) for c in selected_choices ]
            self.filter_choices_to_render(selected_choices)

        html = super(WidgetMixin, self).render_options(*args)

        if self.url:
            self.choices = all_choices

        return html