python - 模板渲染 Django 1.6 期间的 Dijan 错误

Question

我正在尝试使用 django 1.6 进行项目。但在代码第 5 行下方传递错误。没有该行，一切正常。我是新程序员。期待一些专家的帮助。

1   {% extends "base.html" %}
2   
3   {% block content %}
4       {% for post in posts_list %}
5         <h2><a href="{% url post slug=post.slug %}">{{ post.title }}</a></h2>
6         <p>{{ post.body|truncatewords:20 }}</p>
7         <p>
8           {{ post.created_at }} |
9           {% with total=post.comments|length %}
10              {{ total }} comment{{ total|pluralize }}
11          {% endwith %}
12        </p>
13      {% endfor %}
14  {% endblock %}

网址.py

from django.conf.urls import patterns, include, url
from django.views.generic import ListView, DetailView
from .models import Post

urlpatterns = patterns('',
    url(r'^$', ListView.as_view(
        queryset=Post.objects.all(),
        context_object_name="posts_list"),
        name="home"
    ),
    url(r'^post/(?P<slug>[a-zA-Z0-9-]+)/$', DetailView.as_view(
        queryset=Post.objects.all(),
        context_object_name="post"),
        name="post"
    ),
)

模型.py

from django.db import models

# Create your models here.

from django.core.urlresolvers import reverse

from djangotoolbox.fields import ListField, EmbeddedModelField


class Post(models.Model):
    created_at = models.DateTimeField(auto_now_add=True, db_index=True)
    title = models.CharField(max_length=255)
    slug = models.SlugField()
    body = models.TextField()
    comments = ListField(EmbeddedModelField('Comment'), editable=False)

    def get_absolute_url(self):
        return reverse('post', kwargs={"slug": self.slug})

    def __unicode__(self):
        return self.title

    class Meta:
        ordering = ["-created_at"]


class Comment(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    body = models.TextField(verbose_name="Comment")
    author = models.CharField(verbose_name="Name", max_length=255)

如果您需要，我会提供更多详细信息。

===============完整回溯============================ ===========

Environment:


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

Django Version: 1.6.11
Python Version: 2.7.6
Installed Applications:
('django_mongodb_engine',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'marcador')
Installed Middleware:
('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')


Template error:
In template /home/umayanga/Desktop/mongoProject/test2/marcador/templates/marcador/post_list.html, error at line 5
   coercing to Unicode: need string or buffer, Post found
   1 : {% extends "base.html" %}


   2 : 


   3 : {% block content %}


   4 :     {% for post in posts_list %}


   5 :       <h2><a href=" {% url post slug=post.slug %} ">{{ post.title }}</a></h2>


   6 :       <p>{{ post.body|truncatewords:20 }}</p>


   7 :       <p>


   8 :         {{ post.created_at }} |


   9 :         {% with total=post.comments|length %}


   10 :             {{ total }} comment{{ total|pluralize }}


   11 :         {% endwith %}


   12 :       </p>


   13 :     {% endfor %}


   14 : {% endblock %}

Traceback:
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  137.                 response = response.render()
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/response.py" in render
  105.             self.content = self.rendered_content
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/response.py" in rendered_content
  82.         content = template.render(context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/base.py" in render
  140.             return self._render(context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/base.py" in _render
  134.         return self.nodelist.render(context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/base.py" in render
  840.                 bit = self.render_node(node, context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  78.             return node.render(context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  123.         return compiled_parent._render(context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/base.py" in _render
  134.         return self.nodelist.render(context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/base.py" in render
  840.                 bit = self.render_node(node, context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  78.             return node.render(context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  62.             result = block.nodelist.render(context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/base.py" in render
  840.                 bit = self.render_node(node, context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/debug.py" in render_node
  78.             return node.render(context)
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  196.                         nodelist.append(node.render(context))
File "/home/umayanga/Desktop/mongoProject/myprojec/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  439.                     url = reverse(project_name + '.' + view_name,

Exception Type: TypeError at /
Exception Value: coercing to Unicode: need string or buffer, Post found

Answer 1

显然，您没有在 post 周围加上引号 在{% url post slug=post.slug %} .

当你做 {% url post slug=post.slug %} post 的值通过的是Post来自 for 的对象在模板中循环，而不是名称为 post 的 url .这可以通过错误 coercing to Unicode: need string or buffer, Post found 找到。其中提到一个 Post找到对象。

要解决您的问题，您需要在 post 周围使用引号在你的url标记，以便它使用反向名称为 'post' 的 url .

{% url 'post' slug=post.slug %}