问烧瓶-

EN

class Post(db.Model):
    __tablename__ = 'posts'
    id = db.Column(db.Integer, primary_key=True, nullable=False)
    time = db.Column(db.DateTime, index=True, nullable=False, default=datetime.utcnow)
    text = db.Column(db.Text, nullable=False)
    num_of_comments = db.Column(db.Integer, index=True, default=0)    
    comments = db.relationship('Comment', backref='post', lazy='dynamic')

class Comment(db.Model):
    __tablename__ = 'comments'
    id = db.Column(db.Integer, primary_key=True)
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    author_id = db.Column(db.Integer, db.ForeignKey('users.id'))
    post_id = db.Column(db.Integer, db.ForeignKey('posts.id'))
    text = db.Column(db.Text)

@main.route('/post/<int:id>', methods=['GET', 'POST'])
def post(id):
    post = Post.query.get_or_404(id)
    form = CommentForm()

    if form.validate_on_submit():
      comment_author = current_user._get_current_object()
      comment = Comment(text = form.text.data
                  post=post,
                  author=comment_author)
      db.session.add(comment)
      if post.num_of_comments == None:
        post.num_of_comments = 0
      post.num_of_comments += 1
      flash('Your comment has been submitted.')
      return redirect(url_for('.post', id=post.id))

    comments = post.comments.order_by(Comment.timestamp.desc())
    return render_template('post.html', posts=[post], form=form, comments=comments)