Django 根据标签过滤博客

Question

我正在尝试根据标签过滤我的博客。我已经设法弄清楚如何显示所有标签，但现在我希望用户能够单击标签并显示基于该标签的博客文章筛选列表。

我收到一个错误:

ValueError invalid literal for int() with base 10: 'testtag'

网址.py

urlpatterns = [
    # Examples: /blogs
    url(r'^tags$', 'blog.views.tags', name='tags'),
    url(r'^tags/(?P<blog_tagslug>[\w-]+)$', 'blog.views.tagslist', name='tagslist'), 

View .py

def tags(request):
    blog_obj = Tag.objects.all()
    paginator = Paginator(blog_obj, 5)

    page = request.GET.get('page')

    try:
        blog_list = paginator.page(page)
    except PageNotAnInteger:
        # If page is not an integer, deliver first page.
        blog_list = paginator.page(1)
    except EmptyPage:
        # If page is out of range (e.g. 9999), deliver last page of results.
        blog_list = paginator.page(paginator.num_pages)

    template_hash = {'blog_list':blog_list}
    return render(request,'blog/tags.html', template_hash)

def tagslist(request, blog_tagslug):
    #blog = Blog.objects.get(pk=blog_id)
    #blog = Tag.objects.all().filter(tagslug=blog_tagslug)
    blog = Blog.objects.all().filter(tags=blog_tagslug)

    paginator = Paginator(blog, 2)

    page = request.GET.get('page')

    try:
        blog_list = paginator.page(page)
    except PageNotAnInteger:
        # If page is not an integer, deliver first page.
        blog_list = paginator.page(1)
    except EmptyPage:
        # If page is out of range (e.g. 9999), deliver last page of results.
        blog_list = paginator.page(paginator.num_pages)

    template_hash = {'blog_list':blog_list}
    return render(request,'blog/index.html', template_hash)

tags.html(工作正常)

<h1>All Tags</h1>
{% if blog_list %}
    <ul>
    {% for blog in blog_list %}
        {{ blog.image.thumbnail.url }}

        <li><a href="{% url "tagslist" blog.tagslug %}">{{ blog.tagslug }}</a></li>
        {{ blog.tags.all|join:", " }} <br>
    {% endfor %}
    </ul>
{% else %}
    <p>No blogs are available.</p>
{% endif %}

<div class="pagination">
    <span class="step-links">
        {% if blog_list.has_previous %}
            <a href="?page={{ blog_list.previous_page_number }}">previous</a>
        {% endif %}

        <span class="current">
            Page {{ blog_list.number }} of {{ blog_list.paginator.num_pages }}.
        </span>

        {% if blog_list.has_next %}
            <a href="?page={{ blog_list.next_page_number }}">next</a>
        {% endif %}
    </span>
</div>   

tagslist.html(不工作会出错)

<h1>Blog Index</h1>
{% if blog_list %}
    <ul>
    {% for blog in blog_list %}
        {{ blog.image.thumbnail.url }}

        <li><a href="{% url "show" blog.id blog.slug %}">{{ blog.blog_title }}</a></li>
        {{ blog.tags.all|join:", " }} <br>
    {% endfor %}
    </ul>
{% else %}
    <p>No blogs are available.</p>
{% endif %}

<div class="pagination">
    <span class="step-links">
        {% if blog_list.has_previous %}
            <a href="?page={{ blog_list.previous_page_number }}">previous</a>
        {% endif %}

        <span class="current">
            Page {{ blog_list.number }} of {{ blog_list.paginator.num_pages }}.
        </span>

        {% if blog_list.has_next %}
            <a href="?page={{ blog_list.next_page_number }}">next</a>
        {% endif %}
    </span>
</div>

模型.py

from django.db import models
from django.contrib.auth.models import User
from django.core.urlresolvers import reverse
from django.conf import settings

# Create your models here.

class Image(models.Model):
     name = models.CharField(max_length = 255)
     image = models.ImageField(upload_to="%Y/%m/%d",max_length=500,blank=True,null=True)
     thumbnail = models.ImageField(upload_to="%Y/%m/%d",max_length=500,blank=True,null=True)

     def __str__(self):
        return self.name


class Tag(models.Model):
    tagslug = models.SlugField(max_length=200, unique=True)

    def __str__(self):
        return self.tagslug

class Author(models.Model):
    authorname = models.CharField(max_length=200, null=True)

    def __str__(self):
        return self.authorname


class Blog(models.Model):
    blog_title = models.CharField(max_length = 200)
    author = models.ForeignKey(Author)
    image = models.ForeignKey(Image)    
    blog_content = models.TextField()
    slug = models.SlugField(max_length=200, unique=True)
    publish = models.BooleanField(default=True)
    created = models.DateTimeField(auto_now_add=True)
    modified = models.DateTimeField(auto_now=True)
    tags = models.ManyToManyField(Tag)
    user_id = models.ForeignKey(User)

    def __str__(self):
        return self.blog_title

class Comment(models.Model):
    comment_content = models.TextField()
    created = models.DateTimeField(auto_now_add=True)
    modified = models.DateTimeField(auto_now=True)  
    blog_id = models.ForeignKey(Blog)
    user_id = models.ForeignKey(User)

    def __str__(self):
        return '{0}, {1}'.format(self.comment_content, self.created)

Answer 1

问题在于 tags 需要一个 Tag 对象列表，而您传递的是一个字符串。您应该按照标签的 slug 过滤博客，如下所示:

blog = Blog.objects.all().filter(tags__tagslug=blog_tagslug)