本学期我学习了使用Flask框架搭建一个web service，并在其中加上一些简单的css，js，html等。Python是一种高级动态，完全面向对象的语言，方便快捷。关于web的建设，前端页面我们做了导肮页面、登录注册页面、发布问答页面，在后端建设过程中我们引入了flask库中的Flask, render_template，用于创建一个Flask对象以及页面的跳转，引入flask_sqlalchemy库进行数据库的关联映射等，在后端设计过程我们学了对数据的增删改查等操作，利用对数据库的查询添加功能实现了页面的登陆、注册以及发布功能，这些功能的实现根据前端页面的name属性名，后台请求接收同名name的值，再将接收的值做一系列增删查改操作。在对这些name属性命名时要注意前后端对应且同一页面不能出现相同名，否则会出现数据传递出错，在做发布详情中我们在页面跳转请求时带上需要用到的‘id’，利用该‘id’去后台查询数据，在做用户详情时我们用三个页面跳转同一个请求，不同的是在请求中用if语句判断，判断各自实现的功能并跳转不同页面。在这些过程中，其实遇到过很多的问题，css总是无法调整成自己想要的样子，就查阅参考了很多网页，模仿他们的div构造。并且在实行增删改查功能时也会出现name属性名不一致而导致功能无法实现的问题。
1.使用工具：pycharm64.exe 、Python 3.6 、MySQL
Python
Python是一种面向对象的解释型计算机程序设计语言，Python是纯粹的自由软件， 源代码和解释器CPython遵循 GPL(GNU General Public License)协议。Python语法简洁清晰，特色之一是强制用空白符(white space)作为语句缩进。Python具有丰富和强大的库。它常被昵称为胶水语言，能够把用其他语言制作的各种模块（尤其是C/C++）很轻松地联结在一起。常见的一种应用情形是，使用Python快速生成程序的原型（有时甚至是程序的最终界面），然后对其中有特别要求的部分，用更合适的语言改写，比如3D游戏中的图形渲染模块，性能要求特别高，就可以用C/C++重写，而后封装为Python可以调用的扩展类库。需要注意的是在您使用扩展类库时可能需要考虑平台问题，某些可能不提供跨平台的实现。
Flask
Flask是一个面向简单需求小型应用的“微框架（microframework）”，Flask选择组件的额外工作给那些使用案例不适用标准ORM的开发者提供了更多的灵活性，同样也给使用不同工作流和模版化系统的开发者们带来了灵活性。
虽然Flask历史相对更短，但它能够学习之前出现的框架并且把注意力放在了微小项目上。它大多数情况被使用在一些只有一两个功能的小型项目上。例如 httpbin，一个简单的（但很强大的）调试和测试HTTP库的项目。Flask没有bootstrapping工具的原因：没有它们的需求。从Flask主页上的Hello World特性看，没有构建Python web应用经验的开发者可以立即开始hacking。对于各部分需要更多分离的项目，Flask有blueprints。例如，你可以将所有用户相关的函数放在users.py中，然后在site.py中添加引用它们来结构化你的Flask应用。我们不会深入这个功能，因为它超出了我们展示demo应用的需求。Flask对于那些开发小项目、需要快速制作一个简单的Python支撑的网站的开发者很有用。它提供小型的统一工具，或者在已有的API上构建的简单网络接口。可以快速开发需要简单web接口并不怎么配置的后端项目使用Flask将会在前端获益，如jitviewer提供了一个web接口来检测PyPy just-in-time的编译日志。MySQL
关于数据库，上学期我们学习了sql server，它和MySQL有一点不一样，MySQL不支持事务处理，没有视图，没有存储过程和触发器，没有数据库端的用户自定义函数，不能完全使用标准的SQL语法。 MySQL是一个关系型数据库管理系统，MySQL 是最流行的关系型数据库管理系统之一，在 WEB 应用方面，MySQL是最好的 RDBMS (Relational Database Management System，关系数据库管理系统) 应用软件。MySQL是一种关系数据库管理系统，关系数据库将数据保存在不同的表中，而不是将所有数据放在一个大仓库内，这样就增加了速度并提高了灵活性。MySQL所使用的 SQL 语言是用于访问数据库的最常用标准化语言。MySQL 软件采用了双授权政策，分为社区版和商业版，由于其体积小、速度快、总体拥有成本低，尤其是开放源码这一特点，一般中小型网站的开发都选择 MySQL 作为网站数据库。
2.功能实现过程
{% extends "bootstrap_base.html" %}{ % block head %} { % block metas %} BLOG { % endblock%} { % block styles %} { % endblock %}{ % endblock %} { % block navbar %} Blog
首页：
index.html：
def deletenoneuser(): noneuser = User.query.filter_by(username=None).all() for user in noneuser: db.session.delete(user) db.session.commit()@main.before_app_requestdef before_request(): #定义全局变量 g.search_form = SearchForm() g.hot_post=Post().hotpost() g.current_time=datetime.utcnow() g.categorys=Category.query.all() @main.after_app_requestdef after_request(response): for query in get_debug_queries(): if query.duration >= current_app.config['FLASKY_SLOW_DB_QUERY_TIME']: current_app.logger.warning( 'Slow query: %s\nParameters: %s\nDuration: %fs\nContext: %s\n' % (query.statement, query.parameters, query.duration, query.context)) return response@main.route('/shutdown')def server_shutdown(): if not current_app.testing: abort(404) shutdown = request.environ.get('werkzeug.server.shutdown') if not shutdown: abort(500) shutdown() return 'Shutting down...'@main.route('/search', methods = ['POST'])def search(): if not g.search_form.validate_on_submit(): return redirect(url_for('.index')) return redirect(url_for('.search_results', query = g.search_form.search.data))@main.route('/search_results/ ')def search_results(query): posts = Post.query.filter(Post.head.like('%'+query+'%')).all() # query=Post.query.filter(Post.head.like("%文%")).all() return render_template('search_results.html',query = query, posts = posts, )@main.route('/', methods=['GET', 'POST'])def index(): deletenoneuser() user = User() message = Message() category = Category() page = request.args.get('page', 1, type=int) show_followed = False if current_user.is_authenticated: show_followed = bool(request.cookies.get('show_followed', '')) if show_followed: query = current_user.followed_posts else: query = Post.query pagination = query.order_by(Post.timestamp.desc()).paginate( page, per_page=current_app.config['FLASKY_POSTS_PER_PAGE'], error_out=False) posts = pagination.items[:] #分页显示 return render_template('index.html', posts=posts,user=user,message=message,category=category, show_followed=show_followed, pagination=pagination,hot_post=Post().hotpost())@main.route('/writepost', methods=['GET', 'POST'])@login_requireddef writepost(): form = PostForm() if current_user.can(Permission.WRITE_ARTICLES) and \ form.validate_on_submit(): post = Post(body=form.body.data,head=form.head.data,category=Category.query.get(form.category.data), author=current_user._get_current_object()) #内容、标题、作者、类别 db.session.add(post) db.session.commit() #flash("博客已发布") return redirect(url_for('.index')) return render_template('writepost.html', form=form, )@main.route('/user/ ')def user(username): user = User.query.filter_by(username=username).first_or_404() page = request.args.get('page', 1, type=int) pagination = user.posts.order_by(Post.timestamp.desc()).paginate( page, per_page=current_app.config['FLASKY_POSTS_PER_PAGE'], error_out=False) posts = pagination.items return render_template('user.html', user=user, posts=posts, pagination=pagination, )#分类路由@main.route('/category/ ')def category(id): category = Category.query.get_or_404(id) page = request.args.get('page', 1, type=int) pagination = category.posts.order_by(Post.timestamp.desc()).paginate( page, per_page=current_app.config['FLASKY_POSTS_PER_PAGE'], error_out=False) posts = pagination.items return render_template('category.html',category=category,posts=posts,pagination=pagination, )@main.route('/edit-profile', methods=['GET', 'POST'])@login_requireddef edit_profile(): form = EditProfileForm() if form.validate_on_submit(): current_user.name = form.name.data current_user.location = form.location.data current_user.about_me = form.about_me.data db.session.add(current_user) flash('Your profile has been updated.') return redirect(url_for('.user', username=current_user.username)) form.name.data = current_user.name form.location.data = current_user.location form.about_me.data = current_user.about_me return render_template('edit_profile.html', form=form, )@main.route('/edit-profile/ ', methods=['GET', 'POST'])@login_required@admin_requireddef edit_profile_admin(id): user = User.query.get_or_404(id) form = EditProfileAdminForm(user=user) if form.validate_on_submit(): user.email = form.email.data user.username = form.username.data user.confirmed = form.confirmed.data user.role = Role.query.get(form.role.data) user.name = form.name.data user.location = form.location.data user.about_me = form.about_me.data db.session.add(user) flash('The profile has been updated.') return redirect(url_for('.user', username=user.username)) form.email.data = user.email form.username.data = user.username form.confirmed.data = user.confirmed form.role.data = user.role_id form.name.data = user.name form.location.data = user.location form.about_me.data = user.about_me return render_template('edit_profile.html', form=form, user=user, )@main.route('/post/ ', methods=['GET', 'POST'])def post(id): hot_post=Post().hotpost() post = Post.query.get_or_404(id) form = CommentForm() post.visits+=1 print ("visits+1") if form.validate_on_submit(): comment = Comment(body=form.body.data,post=post,sendto=post.author, author=current_user._get_current_object()) db.session.add(comment) flash(u'你的评论已提交.') return redirect(url_for('.post', id=post.id, page=-1)) page = request.args.get('page', 1, type=int) if page == -1: page = (post.comments.count() - 1) // \ current_app.config['FLASKY_COMMENTS_PER_PAGE'] + 1 pagination = post.comments.order_by(Comment.timestamp.asc()).paginate( page, per_page=current_app.config['FLASKY_COMMENTS_PER_PAGE'], error_out=False) comments = pagination.items return render_template('post.html', posts=[post], form=form, comments=comments, pagination=pagination, hot_post=hot_post)@main.route('/post/delete/ ')def post_delete(id): post=Post.query.get_or_404(id) db.session.delete(post) for comment in post.comments: db.session.delete(comment) for webpush in post.webpushs: db.session.delete(webpush) flash(u'博客以及相关的评论、推送已删除') return redirect(url_for('.user', username=post.author.username))@main.route('/edit/ ', methods=['GET', 'POST'])@login_requireddef edit(id): post = Post.query.get_or_404(id) if current_user != post.author and \ not current_user.can(Permission.ADMINISTER): abort(403) form = PostForm() if form.validate_on_submit(): post.body = form.body.data post.head = form.head.data post.category=Category.query.get(form.category.data) #博客内容和标题 db.session.add(post) flash('The post has been updated.') return redirect(url_for('.post', id=post.id)) form.body.data = post.body form.head.data = post.head form.category.data = post.category_id return render_template('edit_post.html', form=form)#收藏@main.route('/star/ ')@login_required@permission_required(Permission.FOLLOW)def star(id): post=Post.query.get_or_404(id) if current_user.staring(post): flash('你已经收藏了这篇文章') return redirect(url_for('.post',id=post.id)) current_user.star(post) flash('收藏完成') return redirect(url_for('.post',id=post.id))@main.route('/unstar/ ')@login_required@permission_required(Permission.FOLLOW)def unstar(id): post=Post.query.get_or_404(id) if not current_user.staring(post): flash('你没有收藏这篇文章') return redirect(url_for('.post',id=post.id)) current_user.unstar(post) flash('你不收藏这篇旷世奇文，太可惜了') return redirect(url_for('.post',id=post.id))@main.route('/deletestar/ ')@login_required@permission_required(Permission.FOLLOW)def deletestar(id): post=Post.query.get_or_404(id) if not current_user.staring(post): flash('你没有收藏这篇文章') return redirect(url_for('.starposts',username=current_user.username)) current_user.unstar(post) flash('你不再收藏这篇旷世奇文了，太可惜了') return redirect(url_for('.starposts',username=current_user.username))@main.route('/user/ /starposts')def starposts(username): user = User.query.filter_by(username=username).first() if user is None: flash('Invalid user.') return redirect(url_for('.index')) page = request.args.get('page', 1, type=int) # pagination = user.starposts.paginate( # page, per_page=current_app.config['FLASKY_FOLLOWERS_PER_PAGE'], # error_out=False) posts = user.starposts return render_template('user_starposts.html', user=user, title="收藏的文章", posts=posts)@main.route('/follow/ ')@login_required@permission_required(Permission.FOLLOW)def follow(username): user = User.query.filter_by(username=username).first() if user is None: flash('Invalid user.') return redirect(url_for('.index')) if current_user.is_following(user): flash('You are already following this user.') return redirect(url_for('.user', username=username)) current_user.follow(user) flash('You are now following %s.' % username) return redirect(url_for('.user', username=username))@main.route('/unfollow/ ')@login_required@permission_required(Permission.FOLLOW)def unfollow(username): user = User.query.filter_by(username=username).first() if user is None: flash('Invalid user.') return redirect(url_for('.index')) if not current_user.is_following(user): flash('You are not following this user.') return redirect(url_for('.user', username=username)) current_user.unfollow(user) flash('You are not following %s anymore.' % username) return redirect(url_for('.user', username=username))@main.route('/followers/ ')def followers(username): user = User.query.filter_by(username=username).first() if user is None: flash('Invalid user.') return redirect(url_for('.index')) page = request.args.get('page', 1, type=int) pagination = user.followers.paginate( page, per_page=current_app.config['FLASKY_FOLLOWERS_PER_PAGE'], error_out=False) follows = [{ 'user': item.follower, 'timestamp': item.timestamp} for item in pagination.items] return render_template('followers.html', user=user, title="Followers of", endpoint='.followers', pagination=pagination, follows=follows, )@main.route('/followed-by/ ')def followed_by(username): user = User.query.filter_by(username=username).first() if user is None: flash('Invalid user.') return redirect(url_for('.index')) page = request.args.get('page', 1, type=int) pagination = user.followed.paginate( page, per_page=current_app.config['FLASKY_FOLLOWERS_PER_PAGE'], error_out=False) follows = [{ 'user': item.followed, 'timestamp': item.timestamp} for item in pagination.items] return render_template('followers.html', user=user, title="Followed by", endpoint='.followed_by', pagination=pagination, follows=follows, )@main.route('/all')@login_requireddef show_all(): resp = make_response(redirect(url_for('.index'))) resp.set_cookie('show_followed', '', max_age=30*24*60*60) return resp@main.route('/followed')@login_requireddef show_followed(): resp = make_response(redirect(url_for('.index'))) resp.set_cookie('show_followed', '1', max_age=30*24*60*60) return resp@main.route('/moderate/enable/ ')@login_required@permission_required(Permission.MODERATE_COMMENTS)def moderate_enable(id): comment = Comment.query.get_or_404(id) comment.disabled = False db.session.add(comment) return redirect(url_for('.moderate', page=request.args.get('page', 1, type=int)), )@main.route('/moderate/disable/ ')@login_required@permission_required(Permission.MODERATE_COMMENTS)def moderate_disable(id): comment = Comment.query.get_or_404(id) comment.disabled = True db.session.add(comment) return redirect(url_for('.moderate', page=request.args.get('page', 1, type=int)), )@main.route('/moderate')@login_required@permission_required(Permission.MODERATE_COMMENTS)def moderate(): page = request.args.get('page', 1, type=int) pagination = Comment.query.order_by(Comment.timestamp.desc()).paginate( page, per_page=current_app.config['FLASKY_COMMENTS_PER_PAGE'], error_out=False) comments = pagination.items return render_template('moderate.html', comments=comments, pagination=pagination, page=page, )@main.route('/shownotice')@login_required@permission_required(Permission.COMMENT)def shownotice(): page = request.args.get('page', 1, type=int) pagination = Comment.query.order_by(Comment.timestamp.desc()).paginate( page, per_page=current_app.config['FLASKY_COMMENTS_PER_PAGE'], error_out=False) comments = pagination.items return render_template('shownotice.html', comments=comments, pagination=pagination, page=page, )@main.route('/shownotice/unconfirmed/ ')@login_required@permission_required(Permission.COMMENT)def shownotice_unconfirmed(id): comment = Comment.query.get_or_404(id) comment.confirmed = True db.session.add(comment) return redirect(url_for('.shownotice', page=request.args.get('page', 1, type=int)), )@main.route('/shownotice/confirmed/ ')@login_required@permission_required(Permission.COMMENT)def shownotice_confirmed(id): comment = Comment.query.get_or_404(id) comment.confirmed = False db.session.add(comment) return redirect(url_for('.shownotice', page=request.args.get('page', 1, type=int)), )@main.route('/user/ /comments')def usercomments(username): user=User.query.filter_by(username=username).first() page = request.args.get('page', 1, type=int) pagination = Comment.query.order_by(Comment.timestamp.desc()).paginate( page, per_page=current_app.config['FLASKY_COMMENTS_PER_PAGE'], error_out=False) comments = pagination.items return render_template('user_comments.html', comments=comments,user=user, pagination=pagination, page=page, )@main.route('/usercomments/delete/ ')@login_required@permission_required(Permission.COMMENT)def usercomments_delete(id): comment = Comment.query.get_or_404(id) db.session.delete(comment) flash("评论已删除") return redirect(url_for('.usercomments',username=current_user.username, page=request.args.get('page', 1, type=int)))@main.route('/sendmessage/ ', methods=['GET', 'POST'])@login_required@permission_required(Permission.COMMENT)def sendmessage(username): user = User.query.filter_by(username=username).first() form = SendmessageForm() if form.validate_on_submit(): message = Message(body=form.body.data, \ author=current_user, sendto=user) db.session.add(message) db.session.commit() flash('私信发送成功') return redirect(url_for('.user', username=username)) return render_template('sendmessage.html', form=form, )@main.route('/ /showwebpush')@login_required@permission_required(Permission.COMMENT)def showwebpush(username): page = request.args.get('page', 1, type=int) pagination = Webpush.query.order_by(Webpush.timestamp.desc()).filter_by(sendto=current_user).paginate( page, per_page=current_app.config['FLASKY_COMMENTS_PER_PAGE'], error_out=False) webpushs = pagination.items return render_template('user_showwebpush.html',webpushs=webpushs,pagination=pagination,page=page)@main.route('/webpush/unconfirmed/ ')@login_required@permission_required(Permission.COMMENT)def webpush_unconfirmed(id): webpush = Webpush.query.get_or_404(id) webpush.confirmed = True db.session.add(webpush) return redirect(url_for('.showwebpush',page=request.args.get('page', 1, type=int),username=request.args.get('username')))@main.route('/webpush/confirmed/ ')@login_required@permission_required(Permission.COMMENT)def webpush_confirmed(id): webpush = Webpush.query.get_or_404(id) webpush.confirmed = False db.session.add(webpush) return redirect(url_for('.showwebpush',page=request.args.get('page', 1, type=int),username=request.args.get('username')))@main.route('/showwebpush/delete/ ')@login_required@permission_required(Permission.COMMENT)def webpush_delete(id): webpush = Webpush.query.get_or_404(id) db.session.delete(webpush) flash('消息删除成功') return redirect(url_for('.showwebpush',page=request.args.get('page', 1, type=int),username=request.args.get('username')))@main.route('/showmessage')@login_required@permission_required(Permission.COMMENT)def showmessage(): page = request.args.get('page', 1, type=int) pagination = Message.query.order_by(Message.timestamp.desc()).filter_by(sendto=current_user).paginate( page, per_page=current_app.config['FLASKY_COMMENTS_PER_PAGE'], error_out=False) messages = pagination.items return render_template('showmessage.html', messages=messages, pagination=pagination, page=page )@main.route('/showmessage/unconfirmed/ ')@login_required@permission_required(Permission.COMMENT)def showmessage_unconfirmed(id): message = Message.query.get_or_404(id) message.confirmed = True db.session.add(message) return redirect(url_for('.showmessage', page=request.args.get('page', 1, type=int)))@main.route('/showmessage/confirmed/ ')@login_required@permission_required(Permission.COMMENT)def showmessage_confirmed(id): message = Message.query.get_or_404(id) message.confirmed = False db.session.add(message) return redirect(url_for('.showmessage', page=request.args.get('page', 1, type=int)))@main.route('/showmessage/delete/ ')@login_required@permission_required(Permission.COMMENT)def message_delete(id): message = Message.query.get_or_404(id) db.session.delete(message) flash('私信删除成功') return redirect(url_for('.showmessage', page=request.args.get('page', 1, type=int)))@main.route('/about', methods=['GET', 'POST'])def firstpage(): return render_template('aboutme.html', )@main.route('/video', methods=['GET', 'POST'])def video(): return render_template('video.html', ) index.css:
profile-thumbnail { position: absolute;}.profile-header { min-height: 260px; margin-left: 280px;}div.post-tabs { margin-top: 16px;}ul.posts { list-style-type: none; padding: 0px; margin: 16px 10px 10px 10px; border-top: 1px solid #e0e0e0;}div.post-tabs ul.posts { margin: 0px; border-top: none;}ul.posts li.post { padding: 8px; border-bottom: 1px solid #e0e0e0;}ul.posts li.post:hover { background-color: #f0f0f0;}div.post-date { float: right;}div.post-author { font-weight: bold;}div.post-thumbnail { position: absolute;}div.post-content { margin-left: 48px; min-height: 48px;}div.post-footer { text-align: right;}ul.comments { list-style-type: none; padding: 0px; margin: 16px 0px 0px 0px;}ul.comments li.comment { margin-left: 32px; padding: 8px; border-bottom: 1px solid #e0e0e0;}ul.comments li.comment:nth-child(1) { border-top: 1px solid #e0e0e0;}ul.comments li.comment:hover { background-color: #f0f0f0;}div.comment-date { float: right;}div.comment-author { font-weight: bold;}div.comment-thumbnail { position: absolute;}div.comment-content { margin-left: 48px; min-height: 48px;}div.comment-form { margin: 16px 0px 16px 32px;}div.pagination { width: 100%; text-align: right; padding: 0px; margin: 0px;}div.flask-pagedown-preview { margin: 10px 0px 10px 0px; border: 1px solid #e0e0e0; padding: 4px;}div.flask-pagedown-preview h1 { font-size: 140%;}div.flask-pagedown-preview h2 { font-size: 130%;}div.flask-pagedown-preview h3 { font-size: 120%;}.post-body h1 { font-size: 140%;}.post-body h2 { font-size: 130%;}.post-body h3 { font-size: 120%;}.table.followers tr { border-bottom: 1px solid #e0e0e0; 登录页面： 
class LoginForm(Form): email = StringField(u'邮箱', validators=[Required(), Length(1, 64), Email()]) password = PasswordField(u'密码', validators=[Required()]) remember_me = BooleanField(u'记住我') submit = SubmitField(u'登录')class RegistrationForm(Form): email = StringField(u'邮箱', validators=[Required(), Length(1, 64), Email()]) username = StringField(u'用户名', validators=[ Required(), Length(1, 64), Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0, 'Usernames must have only letters, ' 'numbers, dots or underscores')]) password = PasswordField(u'密码', validators=[ Required(), EqualTo(u'password2', message='Passwords must match.')]) password2 = PasswordField(u'确认密码', validators=[Required()]) submit = SubmitField(u'注册') def validate_email(self, field): if User.query.filter_by(email=field.data).first(): raise ValidationError(u'Email已经被注册过.请更换') def validate_username(self, field): if User.query.filter_by(username=field.data).first(): raise ValidationError(u'用户名已存在')class ChangePasswordForm(Form): old_password = PasswordField(u'旧密码', validators=[Required()]) password = PasswordField(u'新密码', validators=[ Required(), EqualTo('password2', message='Passwords must match')]) password2 = PasswordField(u'确认新的密码', validators=[Required()]) submit = SubmitField(u'更新密码')class PasswordResetRequestForm(Form): email = StringField(u'邮箱', validators=[Required(), Length(1, 64), Email()]) submit = SubmitField(u'重置密码')class PasswordResetForm(Form): email = StringField(u'邮箱', validators=[Required(), Length(1, 64), Email()]) password = PasswordField(u'新密码', validators=[ Required(), EqualTo('password2', message='Passwords must match')]) password2 = PasswordField(u'确认新的密码', validators=[Required()]) submit = SubmitField(u'重置密码') def validate_email(self, field): if User.query.filter_by(email=field.data).first() is None: raise ValidationError(u'不合法的Email地址')class ChangeEmailForm(Form): email = StringField(u'新邮箱', validators=[Required(), Length(1, 64), Email()]) password = PasswordField(u'密码', validators=[Required()]) submit = SubmitField(u'更新邮箱') def validate_email(self, field): if User.query.filter_by(email=field.data).first(): raise ValidationError(u'邮箱已被使用') 发布评论定义评论的视图函数
@app.route('/comment/',methods=['GET','POST'])@loginFirstdef comment(): if request.method == 'GET': return render_template('question_detail.html') else: detail = request.form.get('detail') author_id =User.query.filter(User.username == session.get('user')).first().id question_id=request.form.get('question_id') comments = Comment(detail=detail,author_id=author_id,question_id=question_id) db.session.add(comments) db.session.commit() return redirect(url_for('question_detail',question_id=question_id)) 显示评论次数，要求评论前登录
{% extends 'index.html' %}{ % block title %}问答详情{% endblock %}{ % block main %} { { ques.question }}{ { ques.author.username }} { { ques.creat_time }}
问题详情： {
{ ques.questionDetail }} 评论
评论:（{ { ques.comments|length }}）
- { % for b in ques.comments %}
- { { b.author.username }} { {b.creat_time}}
{
{b.detail}} { % endfor %}
搜索功能：