从首页问答标题到问答详情页

  1. 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)
    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)
    creat_time=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()

class Comment(db.Model):
    __tablname__='comment'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    authorID = db.Column(db.Integer, db.ForeignKey('User.id'))
    questionID = 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('commment',order_by=creat_time.desc))
    author = db.relationship('User', backref=db.backref('comment'))
db.create_all()


@app.route('/')
def home():
    context={
        'question': Question.query.all()
    }
    return render_template('shouye.html',**context)

@app.route('/detail/<question_id>')
def detail(question_id):
    quest=Question.query.filter(Question.id==question_id).first()
    return render_template('detail.html',ques=quest)

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

     


  2. 首页标题的标签做带参数的链接。
          {{ url_for('detail',question_id = foo.id) }}
    {% extends'base.html' %}
{% block title %}
    Home
{% endblock %}
{% block head %}
    <link rel="stylesheet" href="{{ url_for('static',filename='css/shouye.css')}}" type="text/css">
{% endblock %}
{% block main %}
<body>

<br>
{#<img id="pig" src="../static/images/pig.jpg">#}
<ul class="comment"style=";list-style:none">
    <img class="comment_pic"  src="../static/images/comment.png">
    <p class="wenzi">Question</p>
    {% for foo in question %}

    <li class="detail" >
        <span class="icon" aria-hidden="true"><img src="../static/images/icon.jpg"></span>
        <a href="#" style="float: left;margin:3px auto; line-height:12px;">{{ foo.author.username }}</a>
         <span class="badge">{{ foo.creat_time }}</span>
        <br><hr>
        <a href="{{ url_for('detail',question_id=foo.id) }}" class="title">&nbsp;{{ foo.title }}</a>
        <p class="neirong">&nbsp;{{ foo.detail }}</p>
    </li>

    {% endfor %}

</ul>

</body>
{% endblock %}

     

  3. 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 }} 
    {% extends'base.html' %}
{% block title %}
    Home
{% endblock %}
{% block head %}
    <link rel="stylesheet" href="{{ url_for('static',filename='css/detail.css')}}" type="text/css">
{% endblock %}
{% block main %}
<body>
<div class="detail">
    <div class="detail_left">
    <h2>{{ ques.title }}</h2>
    <a>{{ ques.author.username }}</a>
<span class="badge">{{ ques.creat_time }}</span>
    <hr>
    <a>{{ ques.detail }}</a>
    <hr>
    <textarea name='comment' class="form-control" rows="8" id="questionDetail"></textarea>
    <br><button class="btn-default">发布</button>
    <p>评论：{{ ques.comments }}</p>
    <li class="comment">
        <span class="icon" aria-hidden="true"><img src="../static/images/icon.jpg"></span>
        <a href="#" style="float: left;margin:3px auto; line-height:12px;">username</a>
         <span class="badge2">creat_time</span>
        <br><hr>
        <p class="neirong">detail</p>
    </li>
     <li class="comment">
        <span class="icon" aria-hidden="true"><img src="../static/images/icon.jpg"></span>
        <a href="#" style="float: left;margin:3px auto; line-height:12px;">username</a>
         <span class="badge2">creat_time</span>
        <br><hr>
        <p class="neirong">detail</p>
    </li>

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

     

  4. 建立评论的对象关系映射：

    class Comment(db.Model):
        __tablename__='comment'

    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)
    creat_time=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()

class Comment(db.Model):
    __tablname__='comment'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    authorID = db.Column(db.Integer, db.ForeignKey('User.id'))
    questionID = 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('commment',order_by=creat_time.desc))
    author = db.relationship('User', backref=db.backref('comment'))
db.create_all()

@app.route('/comment/',methods=['POST'])
@login_re
def comment():
    if request.method == 'GET':
        return render_template('detail.html')
    else:

        detail = request.form.get('detail')
        question_id = User.query.filter(User.username == session.get('user')).first().id
        comment = Comment( detail=detail, question_id=question_id)
        db.session.add(comment)
        db.session.commit()
    return redirect(url_for('index'))

def login_re(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        if session.get('comment'):
            return func(*args,**kwargs)
        else:
            return redirect(url_for('login'))
    return wrapper

@app.route('/')
def home():
    context={
        'question': Question.query.all()
    }
    return render_template('shouye.html',**context)

@app.route('/detail/<question_id>')
def detail(question_id):
    quest=Question.query.filter(Question.id==question_id).first()
    return render_template('detail.html',ques=quest)

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

     

  5.  尝试实现发布评论

  6.  

     

posted on 2017-12-06 22:57  106洪瑜  阅读(214)  评论(0)  编辑  收藏  举报