发布功能完成

• 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 datetime import datetime
from functools import wraps

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)

db.create_all()
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)
    creatTime=db.Column(db.DateTime,default=datetime.now)
    authorID=db.Column(db.Integer,db.ForeignKey('User.id'))
    author=db.relationship('User',backref=db.backref('question'))
db.create_all()


@app.route('/')
def home():
    return render_template('shouye.html')

@app.route('/sign_in/',methods=['GET','POST'])
def sign_in():
    if request.method == 'GET':
        return render_template('denglu1.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
                session.permanent = True
                return redirect(url_for('home'))
            else:
                return 'password error'
        else:
            return 'username is not existed.'


@app.route('/sign_up/',methods=['GET','POST'])
def sign_up():
    if request.method == 'GET':
        return render_template('zhuce.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user:
            return 'username existed.'
        else:
            user1 = User(username=username, password=password)
            db.session.add(user1)
            db.session.commit()
            return redirect(url_for('home'))

@app.context_processor
def mycontext():
    username=session.get('user')
    if username:
        return {'username':username}
    else:
        return {}
@app.route('/logout/') #注销
def logout():
    session.clear()
    return redirect(url_for('home'))

def loginFirst(func):
    @wraps(func)
    def wrapper(*args,**kwargs):
        if session.get('user'):
            return func(*args, **kwargs)
        else:
            return redirect(url_for('sign_in'))
    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')
        authorID =User.query.filter(User.username == session.get('user')).first().id
        user = User.query.filter(User.username == session.get('user')).first()
        question = Question.query.filter(Question.title == title).first()
        if question:
            return 'question existed'
        else:
            questions = Question(title=title, detail=detail, authorID=authorID)
            questions.author = user
            db.session.add(questions)
            db.session.commit()
            return redirect(url_for(('home')))

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

 

{% extends'base.html' %}
{% block title %}
    Question
{% endblock %}

{% block head %}
    <link rel="stylesheet" href="{{ url_for('static',filename='css/question.css')}}">
{% endblock %}

{% block main %}

    <div class="question">
        <p class="name">欢迎你，{{ username }}</p>
{#    {% if username %}#}
{#        <p class="name">欢迎你，{{ username }}</p>#}
{#    {% else %}#}
{#        <p class="name">欢迎你，请先<a href="{{ url_for('sign_in') }}" >登录</a>或者<a href="{{ url_for('sign_up') }}">注册</a></p>#}
{#    {% endif %}#}
    <h3>发布问答</h3>
    <form class="biao" action="{{ url_for('question') }}" method="post">
        <div class="form-group">
            <label for="ask">Question</label>
            <br>
            <textarea  name='title'class="form-control" rows="1" id="ask"></textarea>
        </div>
        <br>
        <div class="form-group">
            <label for="questionDetail">Detail</label>
            <br>
            <textarea name='detail' class="form-control" rows="8" id="questionDetail"></textarea>
        </div>
        <label>
        <input type="checkbox">check me out
        <br><br>
        </label>
        <button class="btn-default">发布</button>
    </form>
    </div>
{% endblock %}

 

 

重定向首页