评论列表显示及排序，个人中心显示

Posted 2020-10-17 Marsk

1. 显示所有评论
   {% for foo in ques.comments %}
   
   
2. 所有评论排序
   uquestion = db.relationship(\'Question\', backref=db.backref(\'comments\', order_by=creat_time.desc))
   
   
3. 显示评论条数
   {{ ques.comments|length }}
   
   
4. 完成个人中心

1.个人中心的页面布局（html文件及相应的样式文件）

2.定义视图函数def usercenter(user_id):

3.向前端页面传递参数

4.页面显示相应数据

发布的全部问答

发布的全部评论

个人信息

5.各个页面链接到个人中心

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\'))

class Comment(db.Model):
    __tablename__=\'comment\'
    id=db.Column(db.Integer,primary_key=True,autoincrement=True)
    author_id=db.Column(db.Integer,db.ForeignKey(\'user.id\'))
    question_id=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(\'comments\',order_by=creat_time.desc))
    author=db.relationship(\'User\',backref=db.backref(\'comments\'))
db.create_all()

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(\'/\')
def index():
    context = {
        \'question\':Question.query.all()
    }
    return render_template(\'index.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(\'/comment/\',methods=[\'POST\'])
@loginFirst
def comment():
    comment=request.form.get(\'new_comment\')
    ques_id=request.form.get(\'question_id\')
    auth_id=User.query.filter(User.username==session.get(\'user\')).first().id
    comm=Comment(author_id=auth_id,question_id=ques_id,detail=comment)
    db.session.add(comm)
    db.session.commit()
    return redirect(url_for(\'detail\'),question_id=ques_id)

@app.route(\'/usercenter/<user_id>\')
@loginFirst
def usercenter(user_id):
    user=User.query.filter(User.id==user_id).first()
    context={
        \'user\':user
    }
    return render_template(\'usercenter.html\',**context)

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


@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(\'index\'))

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


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

{% extends\'base.html\' %}
{% block title %}个人中心{% endblock %}

{% block main %}

    <div class="page-header">
        <h3><span class="glyphicon glyphicon-user"aria-hidden="true"></span>{{ username }}<br><small>全部问答<span class="badge"></span> </small> </h3>
        <u1 class="list-group"style="">
            {% for foo in questions %}
                <li class="list-group-item">
                    <span class="glyphicon glyphicon-heart-empty"aria-hidden="true"></span>
                    <a href="#">{{ foo.author.username }}</a>
                    <span class="badge">{{ foo.create_time }}</span>
                    <p style="">{{ foo.detail }}</p>
                </li>
            {% endfor %}
        </u1>
    </div>

    <div class="page-header">
        <h3><span class="glyphicon glyphicon-user"aria-hidden="true"></span>{{ user }}<br><small>全部评论<span class="badge"></span> </small> </h3>
        <u1 class="list-group"style="">
        {% for foo in user.comments %}
            <li class="list-group-item">
                    <span class="glyphicon glyphicon-heart-empty"aria-hidden="true"></span>
                    <a href="#">{{ foo.author.username }}</a>
                    <span class="badge">{{ foo.create_time }}</span>
                    <p style="">{{ foo.detail }}</p>
                </li>
            {% endfor %}
        </u1>
    </div>

    <div class="page-header">
        <h3><span class="glyphicon glyphicon-user"aria-hidden="true"></span>{{ user }}<br><small>个人信息<span class="badge"></span> </small> </h3>
        <u1 class="list-group"style="">
                <li class="list-group-item">用户：{{ user.uername }}</li>
                <li class="list-group-item">编号：{{ user.id }}</li>
                <li class="list-group-item">昵称：</li>
                <li class="list-group-item">文章篇数：</li>
        </u1>
    </div>

{% endblock %}