如何解决如何在基于类的视图中使用url变量
我在使用url变量和基于类的视图时遇到了问题,但是主要在html或模板中,因为我不知道如何表示它,我将向您显示代码,以便您理解。
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(我在添加帖子(当前)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 %}
跟踪
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",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",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>[^/]+)$']
提前谢谢!因此,主要问题是将链接放在模板的href中,我不知道如何表达它。
解决方法
**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
此处是相应Django文档的链接,以获取更多信息:
https://docs.djangoproject.com/en/3.1/topics/class-based-views/generic-display/#adding-extra-context
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