blog.py 文件源码

def post(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

        """
            On posting comment, new comment tuple is created and stored,
            with relationship data of user and post.
        """
        c = ""
        if(self.user):
            # On clicking like, post-like value increases.
            if(self.request.get('like') and
               self.request.get('like') == "update"):
                likes = db.GqlQuery("select * from Like where post_id = " +
                                    post_id + " and user_id = " +
                                    str(self.user.key().id()))

                if self.user.key().id() == post.user_id:
                    self.redirect("/blog/" + post_id +
                                  "?error=You cannot like your " +
                                  "post.!!")
                    return
                elif likes.count() == 0:
                    l = Like(parent=blog_key(), user_id=self.user.key().id(),
                             post_id=int(post_id))
                    l.put()

            # On commenting, it creates new comment tuple
            if(self.request.get('comment')):
                c = Comment(parent=blog_key(), user_id=self.user.key().id(),
                            post_id=int(post_id),
                            comment=self.request.get('comment'))
                c.put()
        else:
            self.redirect("/login?error=You need to login before " +
                          "performing edit, like or commenting.!!")
            return

        comments = db.GqlQuery("select * from Comment where post_id = " +
                               post_id + "order by created desc")

        likes = db.GqlQuery("select * from Like where post_id="+post_id)

        self.render("permalink.html", post=post,
                    comments=comments, noOfLikes=likes.count(),
                    new=c)