发布功能完成。

Posted 2020-10-16 103许雅婷

---

• 编写要求登录的装饰器

from functools import wraps

def loginFirst(func): #参数是函数

@wraps(func)

      def wrapper(*args, ** kwargs): #定义个函数将其返回

          #要求登录

          return func(*args, ** kwargs)

      return wrapper #返回一个函数

• 应用装饰器，要求在发布前进行登录，登录后可发布。

@app.route(\'/question/\',methods=[\'GET\',\'POST\'])
@loginFirst
def question():

 

• 建立发布内容的对象关系映射。

class Question(db.Model):

• 完成发布函数。

保存到数据库。

重定向到首页。

 py

from flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
from datetime import datetime
from functools import wraps

import config
app = Flask(__name__)
app.config.from_object(config)
db = SQLAlchemy(app)


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)

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()

#user=User(username=\'yyyy1\',password=\'111111\')
#db.session.add(user)
#db.session.commit()

#user = User.query.filter(User.username == \'yyyy1\').first()


#user=User.query.filter(User.username==\'yyyy1\').first()
#user.password=\'234567\'
#print(user.username,user.password)
#db.session.commit()

#user=User.query.filter(User.username == \'yyyy1\').first()
#db.session.delete(user)
#db.session.commit()
#
@app.route(\'/\')
def base2():
    return render_template(\'base2.html\')


@app.route(\'/register/\', methods=[\'GET\',\'POST\'])
def register():
    if request.method==\'GET\':
        return render_template(\'register.html\')
    else:
        usern=request.form.get(\'username\')
        passw= request.form.get(\'password\')
        user=User.query.filter(User.username==usern).first()
        if user:
            return \'username existed\'
        else:
            user=User(username=usern,password=passw)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for(\'login2\'))

@app.route(\'/login2/\', methods=[\'GET\',\'POST\'])
def login2():
    if request.method==\'GET\':
        return render_template(\'login2.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(\'base2\'))
                else:
                    return "密码错误，请重新输入。"
        else:
                    return "用户名不存在！"

@app.route(\'/logout/\')
def logout():
    session.clear()
    return redirect(url_for(\'base2\'))

@app.context_processor
def mycontext():
    usern=session.get(\'user\')
    if usern:
        return {\'username\':usern}
    else:
        return {}


def loginFirst(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        if session.get(\'user\'):
            return func(*args, **kwargs)
        else:
            return redirect(url_for(\'login2\'))

    return wrapper

@app.route(\'/question/\',methods=[\'GET\',\'POST\'])
@loginFirst
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(\'base2\'))

if __name__ == \'__main__\':
    app.run(debug=True)

html

{% extends \'base2.html\' %}
{% block title %}
   问题反馈
{% endblock  %}
{% block head %}
    <link rel="stylesheet" type="text/css" href="{{ url_for(\'static\',filename=\'../static/css/q.css\') }}">
    <script src="../static/js/tijiao.js"></script>
{% endblock  %}
{% block main %}
<div class="question-feedback">
<h2> 问题反馈 </h2>
<form action="{{ url_for(\'question\') }}" method="POST">
   <div class="question-control">
       <div>
            <label for="question">问题：</label>
            <br>
            <textarea class="form-control" rows="6" id="questionDetail" placeholder="请输入问题"
                      style="height: 50px"  name="title"></textarea><br>
            <label for="questionDetail">详情：</label>
            <br>
            <textarea class="form-control" rows="6" id="questionDetail" placeholder="请描述详细情况"
                      style="height: 130px" name="detail"></textarea>
       </div>



       <br>
       <button onclick="return Submit()">提交</button>

</div>
</div>
{% endblock  %}