Django-rest-framework: 从 3.9 升级到 3.10 时 include_docs_urls 崩溃

清单

• [ ] 我已验证该问题存在于 Django REST 框架的master分支中。
• [x] 我在打开和关闭的工单中搜索了类似的问题，但找不到重复项。
• [x] 这不是一个用法问题。 （那些应该被引导到讨论组。）
• [x] 这不能作为第三方库处理。 （我们更喜欢在可能的情况下以第三方库的形式提供新功能。）
• [x] 我已将问题简化为最简单的情况。
• [ ] 我已将失败的测试包含为拉取请求。 （如果您无法这样做，我们仍然可以接受该问题。）

重现步骤

使用 djangorestframework==3.10.0

在urls.py ：

from django.urls import path
from rest_framework.documentation import include_docs_urls

urlpatterns = [
    path("docs/", include_docs_urls(title="Platinum API docs")),
]

在浏览器中访问/docs/ 。

预期行为

请不要崩溃。

实际行为

2019-07-19 11:41:21,446 [django.request] [ERROR] Internal Server Error: /docs/
Traceback (most recent call last):
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/django/views/generic/base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/rest_framework/views.py", line 497, in dispatch
    response = self.handle_exception(exc)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/rest_framework/schemas/views.py", line 48, in handle_exception
    return super().handle_exception(exc)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/rest_framework/views.py", line 457, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/rest_framework/views.py", line 468, in raise_uncaught_exception
    raise exc
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/rest_framework/views.py", line 494, in dispatch
    response = handler(request, *args, **kwargs)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/rest_framework/schemas/views.py", line 37, in get
    schema = self.schema_generator.get_schema(request, self.public)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/rest_framework/schemas/coreapi.py", line 153, in get_schema
    links = self.get_links(None if public else request)
  File "/home/thnee/.pyenv/versions/lookatech-platinum/lib/python3.6/site-packages/rest_framework/schemas/coreapi.py", line 140, in get_links
    link = view.schema.get_link(path, method, base_url=self.url)
AttributeError: 'AutoSchema' object has no attribute 'get_link'
2019-07-19 11:41:21,449 [django.server] [ERROR] "GET /docs/ HTTP/1.1" 500 27