替换 django `render_options`

Question

所以我正在实施这个答案：Country/State/City dropdown menus inside the Django admin inline，但是 def render 段代码需要重做....我已经设法重做，但我正在努力寻找一个Widget class.

的 self.render_options 方法（在 1.11 中已弃用）的替换（或正确代码）

我正在使用 Django 2.1。我应该改变什么？这是我的代码：

class StateChoiceWidget(widgets.Select):
    def render(self, name, value, attrs=None, renderer=None):
        self.choices = [(u"", u"---------")]
        if value is None:
            value = ''
            model_obj = self.form_instance.instance
            if model_obj and model_obj.country:
                for m in model_obj.country.state_set.all():
                    self.choices.append((m.id, smart_text(m)))
        else: 
            obj = State.objects.get(id=value)
            for m in State.objects.filter(country=obj.country):
                self.choices.append((m.id, smart_text(m)))

        final_attrs = self.build_attrs(attrs)
        output = ['<select%s>' % flatatt(final_attrs)]
        for option in self.choices:
            output.append('<option value="%s">%s</option>' % (option[0], option[1]))
        output.append('</select>')
        return mark_safe(''.join(output))

楼主更新了示例代码，所以现在问题中的代码不显示了：见上次修订https://whosebug.com/revisions/52174508/1

Answer 1

所以我找到了答案。将 post 放在这里以防有人遇到同样的问题。

class StateChoiceWidget(widgets.Select):
    def render(self, name, value, attrs=None, renderer=None):
        self.choices = [(u"", u"---------")]
        if value is None or value == '':
            value = ''
            model_obj = self.form_instance.instance
            if model_obj and model_obj.country:
                for m in model_obj.country.state_set.all():
                    self.choices.append((m.id, smart_text(m)))
        else: 
            obj = State.objects.get(id=value)
            for m in State.objects.filter(country=obj.country):
                self.choices.append((m.id, smart_text(m)))

        final_attrs = self.build_attrs(attrs) 

        s = widgets.Select(choices=self.choices)
        select_html = s.render(name=name,value=value,attrs=attrs)

        return mark_safe(''.join(select_html))

替换 django `render_options`

Replacement for django `render_options`

django

django-widget