如何在基于 class 的视图中使用 url 变量
How to use url variables in class based views
我在使用 url 变量和基于 class 的视图时遇到问题，但主要是在 html 或模板中，因为我不知道如何表示它，我会给你看代码，这样你就可以理解了。
urls.py
app_name = 'app1'
urlpatterns = [
path('add_post/<str:sym>',AddPostView.as_view(), name='addpost'),
]
views.py
class AddPostView(CreateView):
model = Post
form_class = PostForm
template_name = 'app1/createpost.html'
def get_queryset(self):
ala = Post.objects.filter(stock__symbol=self.kwargs['sym'])
return ala
models.py
class StockNames(models.Model):
name = models.CharField(max_length=255)
symbol = models.CharField(max_length=255)
def __str__(self):
return self.symbol
class Post(models.Model):
title = models.CharField(max_length= 255)
header_image = models.ImageField(null = True, blank = True, upload_to = 'images/')
author = models.ForeignKey(User, on_delete=models.CASCADE)
body = RichTextField(blank = True, null = True)
#body = models.TextField()
post_date = models.DateField(auto_now_add=True)
category = models.CharField(max_length=255, default='coding')
snippet = models.CharField(max_length=255)
likes = models.ManyToManyField(User, related_name = 'blog_posts')
stock = models.ForeignKey(StockNames, null=True, on_delete = models.CASCADE)
def total_likes(self):
return self.likes.count()
def __str__(self):
return self.title + ' | ' + str(self.author)
def get_absolute_url(self):
return reverse('app1:article-detail', args=(self.id,))
模板（我在添加 Post(current) 时遇到问题）
{% extends "app1/base.html" %}
{% block body_block %}
{% if stock_sym %}
<h1> {{sym}} </h1>
<a href ="{% url 'app1:addpost' StockNames.symbol %}">Add Post<span class="sr-only">(current)</span></a>
{% if stocks %}
<ul>
{% for post in stocks %}
<li><a href="{% url 'app1:article-detail' post.pk %}">{{sym}}</a> -
{{post.author}} - <small>{{post.post_date}}</small> -
{% if user.is_authenticated %}
<small><a href="{% url 'app1:updatepost' post.pk %}">Edit</a></small><small>
<a href="{% url 'app1:deletepost' post.pk %}">- Delete</a>
</small></li>
{% endif %}
{{post.body|slice:":200"|safe}}
{% endfor %}
</ul>
{% else %}
<h1>No posts yet</h1>
{% endif %}
{% else %}
<h1>hey</h1>
{% endif %}
{% endblock %}
追踪
Traceback (most recent call last):
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
response = get_response(request)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\handlers\base.py", line 202, in _get_response
response = response.render()
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\response.py", line 105, in render
self.content = self.rendered_content
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\response.py", line 83, in rendered_content
return template.render(context, self._request)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\backends\django.py", line 61, in render
return self.template.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 170, in render
return self._render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 162, in _render
return self.nodelist.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\loader_tags.py", line 150, in render
return compiled_parent._render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 162, in _render
return self.nodelist.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\defaulttags.py", line 312, in render
return nodelist.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\defaulttags.s.py", line 446, in render
url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\urls\base.py", line 8 87, in reverse
return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\urls\resolvers.py", l line 685, in _reverse_with_prefix
raise NoReverseMatch(msg)
django.urls.exceptions.NoReverseMatch: Reverse for 'addpost' with no arguments not found. 1 pattttern(s) tried: ['app1/add_post/(?P<sym>[^/]+)$']
提前致谢！所以主要问题是把link放在模板的href里，我不知道怎么表达。
**编辑
尝试：
<a href ="{% url 'app1:addpost' sym=sym %}">Add Post<span class="sr-only">(current)</span></a>
Views.py - 尝试切换 get_context_data:
的方法
class AddPostView(CreateView):
model = Post
form_class = PostForm
template_name = 'app1/createpost.html'
def get_context_data(self, *args, **kwargs):
context = super().get_context_data(**kwargs)
context.update(
sym=get_object_or_404(StockNames, StockNames.symbol)
)
return context
这里是 link 相应的 Django 文档以获取更多信息：
https://docs.djangoproject.com/en/3.1/topics/class-based-views/generic-display/#adding-extra-context
我在使用 url 变量和基于 class 的视图时遇到问题，但主要是在 html 或模板中，因为我不知道如何表示它，我会给你看代码，这样你就可以理解了。
urls.py
app_name = 'app1'
urlpatterns = [
path('add_post/<str:sym>',AddPostView.as_view(), name='addpost'),
]
views.py
class AddPostView(CreateView):
model = Post
form_class = PostForm
template_name = 'app1/createpost.html'
def get_queryset(self):
ala = Post.objects.filter(stock__symbol=self.kwargs['sym'])
return ala
models.py
class StockNames(models.Model):
name = models.CharField(max_length=255)
symbol = models.CharField(max_length=255)
def __str__(self):
return self.symbol
class Post(models.Model):
title = models.CharField(max_length= 255)
header_image = models.ImageField(null = True, blank = True, upload_to = 'images/')
author = models.ForeignKey(User, on_delete=models.CASCADE)
body = RichTextField(blank = True, null = True)
#body = models.TextField()
post_date = models.DateField(auto_now_add=True)
category = models.CharField(max_length=255, default='coding')
snippet = models.CharField(max_length=255)
likes = models.ManyToManyField(User, related_name = 'blog_posts')
stock = models.ForeignKey(StockNames, null=True, on_delete = models.CASCADE)
def total_likes(self):
return self.likes.count()
def __str__(self):
return self.title + ' | ' + str(self.author)
def get_absolute_url(self):
return reverse('app1:article-detail', args=(self.id,))
模板（我在添加 Post(current) 时遇到问题）
{% extends "app1/base.html" %}
{% block body_block %}
{% if stock_sym %}
<h1> {{sym}} </h1>
<a href ="{% url 'app1:addpost' StockNames.symbol %}">Add Post<span class="sr-only">(current)</span></a>
{% if stocks %}
<ul>
{% for post in stocks %}
<li><a href="{% url 'app1:article-detail' post.pk %}">{{sym}}</a> -
{{post.author}} - <small>{{post.post_date}}</small> -
{% if user.is_authenticated %}
<small><a href="{% url 'app1:updatepost' post.pk %}">Edit</a></small><small>
<a href="{% url 'app1:deletepost' post.pk %}">- Delete</a>
</small></li>
{% endif %}
{{post.body|slice:":200"|safe}}
{% endfor %}
</ul>
{% else %}
<h1>No posts yet</h1>
{% endif %}
{% else %}
<h1>hey</h1>
{% endif %}
{% endblock %}
追踪
Traceback (most recent call last):
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
response = get_response(request)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\handlers\base.py", line 202, in _get_response
response = response.render()
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\response.py", line 105, in render
self.content = self.rendered_content
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\response.py", line 83, in rendered_content
return template.render(context, self._request)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\backends\django.py", line 61, in render
return self.template.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 170, in render
return self._render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 162, in _render
return self.nodelist.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\loader_tags.py", line 150, in render
return compiled_parent._render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 162, in _render
return self.nodelist.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\defaulttags.py", line 312, in render
return nodelist.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\template\defaulttags.s.py", line 446, in render
url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\urls\base.py", line 8 87, in reverse
return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\urls\resolvers.py", l line 685, in _reverse_with_prefix
raise NoReverseMatch(msg)
django.urls.exceptions.NoReverseMatch: Reverse for 'addpost' with no arguments not found. 1 pattttern(s) tried: ['app1/add_post/(?P<sym>[^/]+)$']
提前致谢！所以主要问题是把link放在模板的href里，我不知道怎么表达。
**编辑
尝试：
<a href ="{% url 'app1:addpost' sym=sym %}">Add Post<span class="sr-only">(current)</span></a>
Views.py - 尝试切换 get_context_data:
的方法class AddPostView(CreateView):
model = Post
form_class = PostForm
template_name = 'app1/createpost.html'
def get_context_data(self, *args, **kwargs):
context = super().get_context_data(**kwargs)
context.update(
sym=get_object_or_404(StockNames, StockNames.symbol)
)
return context
这里是 link 相应的 Django 文档以获取更多信息：
https://docs.djangoproject.com/en/3.1/topics/class-based-views/generic-display/#adding-extra-context