所以我在 python 中有以下代码 GAE 代码，它有点长，但基本上它允许用户发布到博客，然后将每个博客帖子保存到用户被重定向到的永久链接，并且用户可以永远重新链接到。永久链接 url 就是 blog/（博客文章 ID）。所以永久链接是通过重定向方法在 NewPost 处理程序中创建的（如果我错了，请纠正我），然后这些永久链接的列表存储在哪里？它可以以某种方式访问吗？因为我无法从视觉上看到它，所以这部分让我有点绊倒。
我从 Udacity.com 学到了所有这些代码，但他们并没有真正解释这一点，我可以让它工作，但不明白它是如何工作的。
import os
import re
from string import letters
import webapp2
import jinja2
from google.appengine.ext import db
template_dir = os.path.join(os.path.dirname(__file__), 'templates')
jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir),
autoescape = True)
def render_str(template, **params):
t = jinja_env.get_template(template)
return t.render(params)
class BlogHandler(webapp2.RequestHandler):
def write(self, *a, **kw):
self.response.out.write(*a, **kw)
def render_str(self, template, **params):
return render_str(template, **params)
def render(self, template, **kw):
self.write(self.render_str(template, **kw))
def render_post(response, post):
response.out.write('<b>' + post.subject + '</b><br>')
response.out.write(post.content)
#front page
class MainPage(BlogHandler):
def get(self):
self.write('Hello, Udacity!')
def blog_key(name = 'default'):
return db.Key.from_path('blogs', name)
#creates the database
class Post(db.Model):
subject = db.StringProperty(required = True)
content = db.TextProperty(required = True)
created = db.DateTimeProperty(auto_now_add = True)
last_modified = db.DateTimeProperty(auto_now = True)
def render(self):
self._render_text = self.content.replace('\n', '<br>')
return render_str("post.html", p = self)
#front of blog with list of last 10 posts
class BlogFront(BlogHandler):
def get(self):
posts = db.GqlQuery("select * from Post order by created desc limit 10")
self.render('front.html', posts = posts)
#displays the permalink page
class PostPage(BlogHandler):
def get(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
if not post:
self.error(404)
return
self.render("permalink.html", post = post)
#create a new post
class NewPost(BlogHandler):
def get(self):
self.render("newpost.html")
def post(self):
subject = self.request.get('subject')
content = self.request.get('content')
if subject and content:
p = Post(parent = blog_key(), subject = subject, content = content)
p.put()
self.redirect('/blog/%s' % str(p.key().id()))
else:
error = "subject and content, please!"
self.render("newpost.html", subject=subject, content=content, error=error)
app = webapp2.WSGIApplication([('/', MainPage),
('/unit2/welcome', Welcome),
('/blog/?', BlogFront),
('/blog/([0-9]+)', PostPage),
('/blog/newpost', NewPost),
],
debug=True)
更新：
是否可以通过以下方式更改代码以使其对搜索引擎更加友好：
class NewPost(BlogHandler):
def get(self):
self.render("newpost.html")
def post(self):
subject = self.request.get('subject')
content = self.request.get('content')
if subject and content:
p = Post(parent = blog_key(), subject = subject, content = content)
p.put()
#the change is in the following line:
self.redirect('/blog/%s/%s' % (str(p.key().id(), str(p.subject)))
else:
error = "subject and content, please!"
self.render("newpost.html", subject=subject, content=content, error=error)
最后更新：
我使用以下代码解决了使其对搜索引擎更友好的问题：
def post(self):
subject = self.request.get('subject')
content = self.request.get('content')
if subject and content:
p = Post(parent = blog_key(), subject = subject, content = content)
p.put()
subject = p.subject
subject = subject.replace(' ', '25fdsa67ggggsd5')
subject = ''.join(e for e in subject if e.isalnum())
subject = subject.replace('25fdsa67ggggsd5', '-')
subject = subject.lower()
self.redirect('/blog/%s/%s' % (str(p.key().id(), str(subject)))
else:
error = "subject and content, please!"
self.render("newpost.html", subject=subject, content=content, error=error)