class User(UserMixin, db.Model):
    # ...
    posts = db.relationship('Post', backref='author', lazy='dynamic')  # 多文章对一用户的关系

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

处理博客文章的首页路由

@main.route('/', methods=['GET', 'POST'])
def index():
    form = PostForm()
    if current_user.can(Permission.WRITE) and form.validate_on_submit():
        post = Post(body=form.body.data, author=current_user._get_current_object())
        db.session.add(post)
        return redirect(url_for('.index'))
    posts = Post.query.order_by(Post.timestamp.desc()).all()
    return render_template('index.html', form=form, posts=posts)

@main.route('/user/<username>')
def user(username):
    user = User.query.filter_by(username=username).first()
    if user is None: # 用户不存在
        abort(404)
    posts = user.posts.order_by(Post.timestamp.desc()).all()
    return render_template('user.html', user=user, posts=posts)