python - 如何解决 Django 中的 "TypeError at/post/new/"

Question

尝试在 Django 版本 2.2 中创建新表单时。我遇到了这个错误

TypeError at /post/new/ join() argument must be str or bytes, not 'tuple'.

我确实尝试过解决这个问题，但还是解决不了。

这些是已采取的步骤..

1. 我在应用程序级别(博客文件夹)为 post_new 添加了一个新的 URLConf

   # blog/urls.py
   from django.urls import path
   from . import views
   urlpatterns = [
       path('post/new/', views.BlogCreateView.as_view(), name='post_new'),
   ]
   

2. 然后，通过导入名为 CreateView 的泛型类来创建 View ，然后 对其进行子类化以创建一个名为 BlogCreateView 的新 View 。

   # blog/views.py
   from django.views.generic import ListView, DetailView
   from django.views.generic.edit import CreateView
   from . models import Post
   
   class BlogCreateView(CreateView):
       model = Post
       template_name = 'post_new.html'
       fields = '__all__'
   

最后一步是创建模板，我们将其命名为 post_new.html。

<!-- templates/post_new.html -->
{% extends 'base.html' %}
{% block content %}
    <h1>New post</h1>
    <form action="" method="post">{% csrf_token %}
        {{ form.as_p }}
        <input type="submit" value="Save" />
    </form>
{% endblock %}

编辑以添加完整的回溯

Environment:

Request Method: GET Request URL: http://127.0.0.1:8000/post/new/

Django Version: 2.2 Python Version: 3.7.3 Installed Applications: ['django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'blog'] Installed Middleware: ['django.middleware.security.SecurityMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware']

Traceback:

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\ntpath.py" in join 89. for p in map(os.fspath, paths):

During handling of the above exception (expected str, bytes or os.PathLike object, not tuple), another exception occurred:

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\exception.py" in inner 34. response = get_response(request)

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\base.py" in _get_response 145. response = self.process_exception_by_middleware(e, request)

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\base.py" in _get_response 143. response = response.render()

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\template\response.py" in render 106. self.content = self.rendered_content

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\template\response.py" in rendered_content 81. template = self.resolve_template(self.template_name)

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\template\response.py" in resolve_template 63. return select_template(template, using=self.using)

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\template\loader.py" in select_template 42. return engine.get_template(template_name)

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\template\backends\django.py" in get_template 34. return Template(self.engine.get_template(template_name), self)

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\template\engine.py" in get_template 143. template, origin = self.find_template(template_name)

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\template\engine.py" in find_template 125. template = loader.get_template(name, skip=skip)

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\template\loaders\base.py" in get_template 18. for origin in self.get_template_sources(template_name):

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\template\loaders\filesystem.py" in get_template_sources 36. name = safe_join(template_dir, template_name)

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\utils_os.py" in safe_join 32. final_path = abspath(join(base, *paths))

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\ntpath.py" in join 115. genericpath._check_arg_types('join', path, *paths)

File "C:\Users\user pc\AppData\Local\Programs\Python\Python37-32\lib\genericpath.py" in _check_arg_types 149. (funcname, s.class.name)) from None

Exception Type: TypeError at /post/new/ Exception Value: join() argument must be str or bytes, not 'tuple'

我使用 python3.7 和 django2.2

Answer 1

根据错误，您写了如下内容:

# blog/views.py
from django.views.generic import ListView, DetailView
from django.views.generic.edit import CreateView
from . models import Post

class BlogCreateView(CreateView):
    model = Post
    template_name = 'post_new.html'<b>,</b>  # a trailing comma
    fields = '__all__'

因此，template_name 不是字符串，而是包含字符串的单例元组。您应该删除尾部逗号。