利用Django编写简单的Blog(八)

接上节:http://www.cnblogs.com/hellopython/archive/2013/05/22/3093606.html

实习分类目录功能

修改models.py为

from django.db import models
from django.contrib.auth.models import User

# Create your models here. 
class Category(models.Model):
    title = models.CharField(max_length=200)
    slug = models.SlugField(max_length=40, unique=True)
    description = models.TextField()

    class Meta:
        verbose_name_plural = "Categories"

    def __unicode__(self):
        return self.title

    def get_absolute_url(self):
        return "/categories/%s/" % self.slug

class Post(models.Model):
    title = models.CharField(max_length=200)
    pub_date = models.DateTimeField()
    text = models.TextField()
    slug = models.SlugField(max_length=40, unique=True)
    author = models.ForeignKey(User)
    categories = models.ManyToManyField(Category, blank=True, null=True, through='CategoryToPost')

    def __unicode__(self):
        return self.title

    def get_absolute_url(self):
        return "/%s/%s/%s/" % (self.pub_date.year, self.pub_date.month, self.slug)

class CategoryToPost(models.Model):
    post = models.ForeignKey(Post)
    category = models.ForeignKey(Category)

接着,编辑admin.py

import models
from django.contrib import admin
from django.contrib.auth.models import User

class CategoryAdmin(admin.ModelAdmin):
    prepopulated_fields = {"slug": ("title",)}

class CategoryToPostInline(admin.TabularInline):
    model = models.CategoryToPost
    extra = 1
    
class PostAdmin(admin.ModelAdmin):
    prepopulated_field = {"slug":("title",)}
    exclude = ('author',)
    inlines = [CategoryToPostInline]

    def save_model(self,request,obj,form,change):
        obj.author = request.user
        obj.save()

admin.site.register(models.Post,PostAdmin)
admin.site.register(models.Category, CategoryAdmin)

 接着编辑views.py

# Create your views here.
from django.shortcuts import render_to_response
from django.core.paginator import Paginator, EmptyPage
from blogengine.models import Post, Category

def getPosts(request, selected_page=1):
    # Get all blog posts
    posts = Post.objects.all().order_by('-pub_date')

    # Add pagination
    pages = Paginator(posts, 5)

    # Get the specified page
    try:
        returned_page = pages.page(selected_page)
    except EmptyPage:
        returned_page = pages.page(pages.num_pages)

    # Display all the posts
    return render_to_response('posts.html', { 'posts':returned_page.object_list, 'page':returned_page})

def getPost(request, postSlug):
    # Get specified post
    post = Post.objects.filter(slug=postSlug)

    # Display specified post
    return render_to_response('single.html', { 'posts':post})

def getCategory(request, categorySlug, selected_page=1):
    # Get specified category
    posts = Post.objects.all().order_by('-pub_date')
    category_posts = []
    for post in posts:
        if post.categories.filter(slug=categorySlug):
            category_posts.append(post)

    # Add pagination
    pages = Paginator(category_posts, 5)

    # Get the category
    category = Category.objects.filter(slug=categorySlug)[0]

    # Get the specified page
    try:
        returned_page = pages.page(selected_page)
    except EmptyPage:
        returned_page = pages.page(pages.num_pages)

    # Display all the posts
    return render_to_response('category.html', { 'posts': returned_page.object_list, 'page': returned_page, 'category': category})

 

 

 在template目录下新建个文件 category.html, 写入如下代码

{% include 'header.html' %}
        <h1>Posts for {{ category.title }}</h1>
        {% if posts %}
        {% for post in posts %}
        <h1><a href="{{ post.get_absolute_url }}">{{ post.title }}</a></h1>
        {{ post.text }}
        {% endfor %}
        <br />
        {% if page.has_previous %}
        <a href="/{{ page.previous_page_number }}/">Previous Page</a>
        {% endif %}
        {% if page.has_next %}
        <a href="/{{ page.next_page_number }}/">Next Page</a>
        {% endif %}
        {% else %}
        <p>No posts matched</p>
        {% endif %}
{% include 'footer.html' %}

 再编辑urls.py

from django.conf.urls import patterns, include, url

# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
    # Examples:
    # url(r'^$', 'DjangoBlog.views.home', name='home'),
    # url(r'^DjangoBlog/', include('DjangoBlog.foo.urls')),

    # Uncomment the admin/doc line below to enable admin documentation:
    # url(r'^admin/doc/', include('django.contrib.admindocs.urls')),

    # Uncomment the next line to enable the admin:
url(r'^admin/', include(admin.site.urls)),
url(r'^$', 'blogengine.views.getPosts'),
url(r'^(?P<selected_page>\d+)/?$', 'blogengine.views.getPosts'),
# Blog posts
url(r'^\d{4}/\d{1,2}/([-a-zA-Z0-9]+)/?$', 'blogengine.views.getPost'),
# Flat pages
url(r'', include('django.contrib.flatpages.urls')),
)

 重新导入数据库 python manage.py syncdb

打开setings.py,并在INSTALLED_APPS下增加

'django.contrib.comments',

 重新导入数据库 python manage.py syncdb

打开urls.py,增加

# Comments
url(r'^comments/', include('django.contrib.comments.urls')),

接着编辑 posts.html

{% include 'header.html' %}
        {% for post in posts %}
        <h1><a href="{{ post.get_absolute_url }}">{{ post.title }}</a></h1>
        {{ post.text }}
        {% endfor %}
        <br />
        {% if page.has_previous %}
        <a href="/{{ page.previous_page_number }}/">Previous Page</a>
        {% endif %}
        {% if page.has_next %}
        <a href="/{{ page.next_page_number }}/">Next Page</a>
        {% endif %}
{% include 'footer.html' %}

然后:category.html

{% include 'header.html' %}
        {% load comments %}
        <h1>Posts for {{ category.title }}</h1>
        {% if posts %}
        {% for post in posts %}
        <h1><a href="{{ post.get_absolute_url }}">{{ post.title }}</a></h1>
        {{ post.text }}
        {% get_comment_count for post as comment_count %}
        <h3>Comments: {{ comment_count }}</h3>
        {% endfor %}
        <br />
        {% if page.has_previous %}
        <a href="/{{ page.previous_page_number }}/">Previous Page</a>
        {% endif %}
        {% if page.has_next %}
        <a href="/{{ page.next_page_number }}/">Next Page</a>
        {% endif %}
        {% else %}
        <p>No posts matched</p>
        {% endif %}
{% include 'footer.html' %}

single.html

{% include 'header.html' %}
        {% load comments %}
        {% for post in posts %}
        <h1><a href="{{ post.get_absolute_url }}">{{ post.title }}</a></h1>
        <h3>{{ post.pub_date }}</h3>
        {{ post.text }}
        <h3>By {{ post.author.first_name }} {{ post.author.last_name }}</h3>
        <h3>Categories: {% for category in post.categories.all %} {{ category.title }} {% endfor %}</h3>
        {% get_comment_count for post as comment_count %}
        <h3>Comments: {{ comment_count }}</h3>
        <ol>
        {% get_comment_list for post as comments %}
        {% for comment in comments %}
        <li>{{ comment }}</li>
        {% endfor %}
        </ol>
        {% render_comment_form for post %}
        {% endfor %}
        <br />
        {% if page.has_previous %}
        <a href="/{{ page.previous_page_number }}/">Previous Page</a>
        {% endif %}
        {% if page.has_next %}
        <a href="/{{ page.next_page_number }}/">Next Page</a>
        {% endif %}
{% include 'footer.html' %}

 views.py增加

fromdjango.templateimportRequestContext

然后修改 views.py getPost最后一句为

returnrender_to_response('single.html',{'posts':post},context_instance=RequestContext(request))

 

接下来就是增加RSS功能了

settings.py 

'django.contrib.syndication',

urls.py

from blogengine.views import PostsFeed


'django.contrib.syndication',

views.py

from django.contrib.syndication.views import Feed

class PostsFeed(Feed):
    title = "My Django Blog posts"
    link = "feeds/posts/"
    description = "Posts from My Django Blog"

    def items(self):
        return Post.objects.order_by('-pub_date')[:5]

    def item_title(self, item):
        return item.title

    def item_description(self, item):
        return item.text