发布功能完成。

Posted 2020-10-16 xuejing

• 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。

from flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
import config
from functools import wraps
from datetime import datetime
app = Flask(__name__)
app.config.from_object(config)
db=SQLAlchemy(app)

class User(db.Model):
    __table__name = ‘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(50))

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()


@app.route(‘/‘)
def base():
    return render_template(‘base.html‘)

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



@app.route(‘/login/‘,methods=[‘GET‘,‘POST‘])
def login():
    if request.method==‘GET‘:
        return render_template(‘login.html‘)
    else:
        username=request.form.get(‘username‘)
        password=request.form.get(‘password‘)
        user = User.query.filter(User.username == username).first()
        if user:
            if user.password==password:
                session[‘user‘]=username
                return redirect(url_for(‘base‘))
            else:
                return u‘password error‘
        else:
            return u‘username is not existed‘



@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(‘base‘))


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
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(‘base‘))

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

{% extends ‘base.html‘ %}
{% block title %}
发布问答
{% endblock %}
{% block head %}
   <link href="{{ url_for(‘static‘,filename=‘label.css‘) }}" rel="stylesheet" type="text/css">
<script src="{{ url_for(‘static‘,filename=‘js/login.js‘) }}" type="text/javascript"></script>
{% endblock %}

{% block main %}
    <div class="box">
        <h2 align="center">发布问答</h2>
        <form  class="all" action="{{ url_for(‘question‘) }}" method="POST">
        <div class="input_box" align="center">
            <label for="question">标题</label>
            <textarea id="question" cols="40" rows="1" placeholder="请输入标题"></textarea>
        </div>
        <div class="input_box" align="center">
            <label for="questionDetail" >内容</label>
            <textarea class="form-control" id="questionDetail" cols="50" rows="5" placeholder="请输入内容"></textarea>
        </div>
        <br>
        <div class="input_box" align="center">
            <button onclick="fnQuestion">发布问答</button>
        </div>
    </div>
</form>

{% endblock %}