Django TypeError：render（）得到了意外的关键字参数'renderer'

问题描述：

我已经升级到Django 2.1，并且在加载管理界面时看到此错误：

I've upgraded to Django 2.1, and I'm seeing this error when I load the admin interface:

TypeError at /admin/foo/bar/1/change/

render() got an unexpected keyword argument 'renderer'

答

这几乎可以肯定是因为该向后不兼容的更改Django 2.1 ：

This is almost certainly because of this backwards-incompatible change in Django 2.1:

支持 Widget.render（）方法，而无需 renderer 参数已删除。

Support for Widget.render() methods without the renderer argument is removed.

您可能已将 django.forms.widgets.Widget 在您的代码中，或在您依赖项之一的代码中。代码可能看起来像这样：

You may have subclassed django.forms.widgets.Widget in your code, or in the code of one of your dependencies. The code may look like this:

from django.forms import widgets

class ExampleWidget(widgets.Widget):
    def render(self, name, value, attrs=None):
        # ...

您需要修复 render 的方法签名，使其看起来像这样：

You need to fix the method signature of render, so that it looks like this:

    def render(self, name, value, attrs=None, renderer=None):

看看源 widgets.Widget 的代码，如果要检查的话。

Have a look at the source code of widgets.Widget if you want to check.