- 主PY文件写视图函数，带id参数。
@app.route('/detail/<question_id>')
def detail(question_id):
quest =
return render_template('detail.html', ques = quest) - 首页标题的标签做带参数的链接。
{{ url_for('detail',question_id = foo.id) }} - 在详情页将数据的显示在恰当的位置。
{{ ques.title}}
{{ ques.id }}{{ ques.creat_time }}{{ ques.author.username }}
{{ ques.detail }} -
建立评论的对象关系映射：
class Comment(db.Model):
__tablename__='comment' -
尝试实现发布评论。
from flask import Flask from flask_sqlalchemy import SQLAlchemy import config from flask import Flask, render_template, request, redirect, url_for,session from functools import wraps from datetime import datetime app = Flask(__name__) app.config.from_object(config) db = SQLAlchemy(app) #登录的数据库 class User(db.Model): __tablename__ = 'user' id = db.Column(db.Integer, primary_key=True, autoincrement=True) username = db.Column(db.String(20), nullable=False) password = db.Column(db.String(20), nullable=False) nickname = db.Column(db.String(20)) db.create_all() #问题页的数据库 class Question(db.Model): __tablename__ = 'question' id = db.Column(db.Integer, primary_key=True, autoincrement=True) title = db.Column(db.String(100), nullable=False) detail = db.Column(db.Text, nullable=False) creat_time= db.Column(db.DateTime,default=datetime.now) author_id=db.Column(db.Integer,db.ForeignKey('user.id')) author=db.relationship('User',backref=db.backref('question')) db.create_all() class Comment(db.Model): __tablename__ = 'comment' id = db.Column(db.Integer, primary_key=True, autoincrement=True) author_id = db.Column(db.Integer, db.ForeignKey('user.id')) question_id=db.Column(db.Integer, db.ForeignKey('question.id')) detail = db.Column(db.Text, nullable=False) creat_time = db.Column(db.DateTime, default=datetime.now) question=db.relationship('Question',backref=db.backref('comments',order_by=creat_time.desc)) author = db.relationship('User', backref=db.backref('comments')) db.create_all() # user=User(username='mis1',password='11111') # db.session.add(user) # db.session.commit() @app.route('/') def base(): return render_template('base.html') # 调用数据库把用户评论放在首页 @app.route('/index/') def index(): context = { 'questions':Question.query.all() } return render_template('index.html',**context) @app.route('/login/',methods=['GET','POST']) def login(): if request.method == 'GET': return render_template('login.html') else: usern = request.form.get('username') passw = request.form.get('password') user = User.query.filter(User.username == usern).first() if user: if user.password==passw: session['user'] = usern session.permanent = True return redirect(url_for('base')) else: return u'password error' else: return u'password is not existed' @app.route('/regist/',methods=['GET','POST']) def regist(): if request.method=='GET': return render_template('regist.html') else: usern=request.form.get('username') passw=request.form.get('password') nickn=request.form.get('nickname') user=User.query.filter(User.username==usern).first() if user: return u'username existed' else: user=User (username=usern,password=passw,nickname=nickn) db.session.add(user) db.session.commit() return redirect(url_for('login')) def loginFirst(func): @wraps(func) def wrapper(*args, ** kwargs): if session.get('user'): return func(*args, ** kwargs) else: return redirect(url_for('login')) return wrapper @app.route('/question/',methods=['GET','POST']) @loginFirst#发布前登录，python装饰器 def question(): if request.method=='GET': return render_template('question.html') else: title = request.form.get('title') detail = request.form.get('detail') author_id = User.query.filter(User.username == session.get('user')).first().id question = Question(title=title, detail=detail, author_id=author_id) db.session.add(question) db.session.commit() return redirect(url_for('index')) #评论功能 @app.route('/fabu/',methods=['GET','POST']) @loginFirst#发布前登录，python装饰器 def fabu(): if request.method == 'GET': return render_template('fabu.html') else: detail = request.form.get('fabu') author_id = User.query.filter(User.username == session.get('user')).first().id pinglun = Comment(detail=detail, author_id=author_id) # question_id = Question.query.filter(User.username == session.get('user')).first().id # pinglun = Comment(question_id=question_id,detail=detail, author_id=author_id) db.session.add(pinglun) db.session.commit() return redirect(url_for('index')) #评论页的详细页 @app.route('/detail/<question_id>') def detail(question_id): context = { 'comments':Comment.query.all() } quest=Question.query.filter(Question.id==question_id).first() return render_template('detail.html',ques=quest, **context) @app.context_processor def mycontext(): usern=session.get('user') if usern: return{'username':usern} else: return{} @app.route('/logout/') def logout(): session.clear() return redirect(url_for('index')) if __name__ == '__main__': app.run(debug=True)
{% extends 'base.html' %} {% block title %} 首页 {% endblock %} {% block head %} <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous"> {% endblock %} {% block main %} <p>{{username}}context</p> <div class="card-body"> <div class="card" style="width:50rem; margin:0 auto"> {# <li class="list-group-item"style="height:10rem">detail{{ question }}</li>#} <ul class="list-group list-group-flush"> {% for foo in questions %} <li class="list-group-item"> <span class="icon" aria-hidden="true"></span> <br> <h3><img src="../static/image/yezi.jpg" width="20" height="20"> <a href="{{ url_for('detail',question_id=foo.id) }}">{{ foo.title }}</a></h3> <p>{{ foo.detail }}</p> <span class="badge"style="float:right">{{ foo.creat_time}}</span> <img src="../static/image/touxiang.jpg" width="20" height="20"> <a href="#">{{ foo.author.username}}</a> </li> {% endfor %} </ul> </div> </div> {% endblock %}{% extends 'base.html' %} {% block title %} 评论页 {% endblock %} {% block head %} <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous"> {% endblock%} {% block main %} <p>{{username}}context</p> <li class="card-body"> <div class="card" style="width:50rem; margin:0 auto"> {# <li class="list-group-item"style="height:10rem">detail{{ question }}</li>#} <ul class="list-group list-group-flush" style="height:100rem"> <li class="list-group-item"> <span class="icon" aria-hidden="true"></span> <br> <h3><img src="../static/image/yezi.jpg" width="20" height="20">{{ ques.title }}</h3> <p>{{ ques.detail }}</p> <span class="badge"style="float:right">{{ ques.creat_time}}</span> <img src="../static/image/touxiang.jpg" width="20" height="20"> <a href="#">{{ ques.author.username}}</a> </li> <li class="list-group-item"style="height:10rem"> <form action="{{ url_for('fabu') }}" method="post"> <textarea rows="2" style="width:40rem"type="password" name="fabu"></textarea> <br> <input type="submit" name="commit" value="发布"> </form> <br> <h4>评论：{{ ques.comments|length }}</h4> <ul class="list-group list-group-flush"> {% for foo in comments %} <li class="list-group-item"> <span class="icon" aria-hidden="true"></span> <br> <h3><img src="../static/image/yezi.jpg" width="20" height="20"> <a href="{{ url_for('detail',question_id=foo.id) }}">{{ foo.title }}</a></h3> <p>{{ foo.detail }}</p> <span class="badge"style="float:right">{{ foo.creat_time}}</span> <img src="../static/image/touxiang.jpg" width="20" height="20"> <a href="#">{{ foo.author.username}}</a> </li> {% endfor %} </ul> </li> </ul> </div> </div> {% endblock %}
