【flask】JinJa2模版渲染及其他小记

一朵灼灼华

发布于 2022-08-05 21:14:47

2440

发布于 2022-08-05 21:14:47

最近在将本站升级为python语言，并使用flask进行实现，中途遇见的问题和一些方法的记录

token及密码校验

class user_info(db.Model):
    __tablename__ = 'user_info'
    username = db.Column(db.Integer, primary_key=True)
    password = db.Column(db.String(255), unique=False)
    role = db.Column(db.Integer, unique=False)
    name = db.Column(db.String(255), unique=False)

    def to_dict(self):
        '''将对象转换为字典数据'''
        reDict = {
            "username": self.username,
            "role": self.role,
            "name": self.name,
        }
        return reDict

    # 获取token，时长秒
    def generate_auth_token(self, expiration=3600 * 24):
        s = Serializer(app.config['SECRET_KEY'], expires_in=expiration)
        return s.dumps(self.username)

    # 通过token解析用户信息
    @staticmethod
    def verify_auth_token(token):
        s = Serializer(app.config['SECRET_KEY'])
        try:
            username = s.loads(token)
        except SignatureExpired:
            print('SignatureExpired', SignatureExpired)
            return None  # valid token, but expired
        except BadSignature:
            print('BadSignature', BadSignature)
            return None  # invalid token
        except Exception as e:
            print('Error: ', e)
            return None
        user = heanny_user_info.query.get(username)
        return user

    def hash_password(self, password):  # 加密
        self.password = pwd_context.encrypt(password)

    def verify_password(self, password):  # 解密
        return pwd_context.verify(password, self.password)

model外键

class h_posts(db.Model):
    __tablename__ = 'posts'
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(255), unique=False)
    content = db.Column(db.Text, unique=False)

    user = db.Column(db.String(255),db.ForeignKey(user_info.username), unique=False)
    author = db.relationship('user_info', backref=db.backref('h_posts'))

分页

    pagination = posts.query.order_by(desc('id')).paginate(page=int(page) if page else 1, per_page=15, error_out=False)
    blogs = list(map(lambda x: x.to_dict(), pagination.items))

blog.html

 <ul class="pagination flex-wrap">
                    {% if pagination.has_prev %}
                        <li class="page-item">
                            <a href="blog-1.html" class="page-link" data-ci-pagination-page="1"
                               rel="start"><i class="fa fa-angle-double-left"></i></a>
                        </li>
                        <li class="page-item ">
                            <a href="/blog-{{ pagination.prev_num }}.html" class="page-link"
                               data-ci-pagination-page="{{ pagination.prev_num }}" rel="prev">
                                <i class="fa fa-chevron-left"></i></a>
                        </li>
                    {% endif %}
                    {% for page in pagination.iter_pages(0,2,4,1) %}
                        {% if page %}
                            <li class="page-item {% if page==pagination.page %}active{% endif %}">
                                <a class="page-link" href="/blog-{{ page }}.html">{{ page }}</a>
                            </li>
                        {% else %}
                            <li class="page-item disabled"><a class="page-link" href="#">&hellip;</a></li>
                        {% endif %}
                    {% endfor %}

                    {% if pagination.has_next %}
                        <li class="page-item ">
                            <a href="/blog-{{ pagination.next_num }}.html" class="page-link"
                               data-ci-pagination-page="{{ pagination.next_num }}" rel="next"><i
                                    class="fa fa-chevron-right"></i></a>
                        </li>
                        <li class="page-item ">
                            <a href="/blog-{{ pagination.pages }}.html" class="page-link"
                               data-ci-pagination-page="pagination.pages"><i class="fa fa-angle-double-right"></i></a>
                        </li>
                    {% endif %}
                </ul>

模板渲染

Jinja2模版:

让页面逻辑独立于业务逻辑,开发的程序易于维护
提供流程控制,继承等高级功能使得模版非常灵活,快速,安全

强大模版

模版支持任何基于文本的格式(HTML/XML/CSV/LaTex等等),并没有特定的扩展名

基础语法:

说明: 模版中支持字符串,数值,列表,元组,字典, boolean(true/false,注意是小写的),除此之外还支持全局函数/内置过滤器|/内置测试器is/in关键字/if关键字/字符连接符~

支持算术运算符,+,-,/,//,%,,*,
支持比较运算符,==,!=,>,>=,<,<=
支持逻辑运算符,and,or,not,(expr)
支持其它运算符,in,is,|,~(连接字符串使用{{ ‘hello ‘ ~ name ~ ‘!’ }},如果name是limanman则返回hello limanman!),()调用可调用量,./[]获取对象属性