發佈功能完成。

• 編寫要求登陸的裝飾器

from functools import wraps

def loginFirst(func): #參數是函數

@wraps(func)

      def wrapper(*args, ** kwargs): #定義個函數將其返回

          #要求登陸

          return func(*args, ** kwargs)

      return wrapper #返回一個函數

• 應用裝飾器，要求在發佈前進行登陸，登陸後可發佈。

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

 

• 創建發佈內容的對象關係映射。

class Question(db.Model):

• 完成發佈函數。

保存到數據庫。

重定向到首頁。

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 index():
    return render_template('index.html')

@app.route('/regist/',methods=['GET','POST'])
def regist():
    if request.method=='GET':
        return render_template('regist.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('index'))
            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('index'))


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('/lable/',methods=['GET','POST'])
@loginFirst
def lable():
    if request.method == 'GET':
        return render_template('lable.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'))

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

 

{% extends 'base.html' %}
{% block title %}
    發佈問答
{% endblock %}
{% block head %}

{%  endblock %}
{% block main %}
<form  class="all" action="{{ url_for('lable') }}" method="POST">
    <div style="margin-left:5%;margin-top: 10%" align="center">
        <h3 >發佈問答</h3>
        <div class="form_group"></div>
        <div class="form_group">
            <!--<label for="questionDetial">標題</label>-->
            <!--<textarea class="form-control" rows="1" id="questionDetial"></textarea>-->
            <label for="biaoti">標題</label>
            <input id="biaoti" type="text" placeholder="請輸入標題!" name="title">

        </div>
        <div class="form_group" >
            <label for="questionDetial">詳情</label>
            <textarea class="form-control" rows="5" id="questionDetial" style="width:60rem " name="detail"></textarea>
        </div>
</div>

        <div class="checkbox" align="center">
            <button type="submit" class="btn bun-default">發佈</button>
        </div>
</form>
{%  endblock %}