昨日回顾
"""
1、redis
1) 优点：内存数据库，IO操作快；nosql数据库，key-value操作数据便捷；支持数据持久化；高并发；支持五种数据类型；
2) 基本命令：
启动：redis-server /配置文件路径 --service-start
连接：redis-cli -h 地址 -p 端口 -a 密码 -n 编号
关闭: redis-cli shutdown
持久化: redis-cli -> save
切换：redis-cli -> select 编号
3) 数据类型：
字符串：set k v | setex k e v
列表: rpush k v1 v2 ...
哈希: hmset k f1 v1 f2 v2 ...
集合：sadd k m1 m2 ...
有序集合：zadd k g1 m1 g2 m2 ...
4) python使用redis：redis
import redis
rdb = redis.Redis(host='127.0.0.1', port=6379, db=0, password=None, decode_responses=True)
pool = redis.ConnectionPool(max_connections=100, host='127.0.0.1', port=6379, db=0, password=None, decode_responses=True)
rdb = redis.Redis(connection_pool=pool)
5) django使用redis：django-redis
配置：CACHES
使用：通过django的cache对象使用redis
2、接口缓存
1) 优先从缓存中取数据，如果没有，再从数据库中取(同步到缓存)
def list(self, request, *args, **kwargs):
data = cache.get('banner_cache')
if not data:
print('走了数据库')
response = super().list(request, *args, **kwargs)
# 不设置过期时间，缓存的更新在后台异步更新(celery异步框架)
cache.set('banner_cache', response.data)
return response
return Response(data)
"""
Celery
Celery 官网：http://www.celeryproject.org/
Celery 官方文档英文版：http://docs.celeryproject.org/en/latest/index.html
Celery 官方文档中文版：http://docs.jinkan.org/docs/celery/
1. 简介
1.1 Celery架构
Celery的架构由三部分组成，消息中间件（message broker）、任务执行单元（worker）和 任务执行结果存储（task result store）组成。
- 消息中间件
Celery本身不提供消息服务，但是可以方便的和第三方提供的消息中间件集成。包括，RabbitMQ, Redis等等
- 任务执行单元
Worker是Celery提供的任务执行的单元，worker并发的运行在分布式的系统节点中。
- 任务结果存储
Task result store用来存储Worker执行的任务的结果，Celery支持以不同方式存储任务的结果，包括AMQP, redis等
1.2 使用场景
异步执行：解决耗时任务
延迟执行：解决延迟任务
定时执行：解决周期(周期)任务
1.3 Celery的安装配置
pip install celery
消息中间件：RabbitMQ/Redis
app=Celery('任务名', broker='xxx', backend='xxx')
2. Celery使用
2.1 Celery执行异步任务
包架构封装
project
├── celery_task # celery包
│ ├── __init__.py # 包文件
│ ├── celery.py # celery连接和配置相关文件，且名字必须交celery.py
│ └── tasks.py # 所有任务函数
├── add_task.py # 添加任务
└── get_result.py # 获取结果
2.2 基本使用 (定时任务)
celery.py
# 1）创建app + 任务
# 2）启动celery(app)服务：
# 非windows
# 命令：celery worker -A celery_task -l info
# windows：
# pip3 install eventlet
# celery worker -A celery_task -l info -P eventlet
# 3）添加任务：手动添加，要自定义添加任务的脚本，右键执行脚本
# 4）获取结果：手动获取，要自定义获取任务的脚本，右键执行脚本
from celery import Celery
broker = 'redis://127.0.0.1:6379/1'
backend = 'redis://127.0.0.1:6379/2'
app = Celery(broker=broker, backend=backend, include=['celery_task.tasks'])
---------------------------------------------------------------------------------------------
# 基本使用
# 1.安装celery
# 2.安装eventlet,
# 3.添加任务 .delay() 异步任务
# 4.执行worker : celery worker -A celery_task -l info -P eventlet
from celery import Celery
# broker提交任务(使用redis0数据库存储)
broker = 'redis://127.0.0.1:6379/0'
# 提供backend用于存储任务结果
backend = 'redis://127.0.0.1:6379/1'
# worker任务执行分发
app = Celery(broker=broker,backend=backend)
# 设定任务@app.task
# 任务就是一个功能函数,执行任务就是执行函数,任务的结果就是任务的返回值
@app.task
def add(a,b):
res = a + b
print('a + b = %s' % res)
return res
@app.task
def low(a,b):
res = a - b
print('a - b = %s' % res)
return res
# 添加任务到worker,自定义添加任务脚本
# 获取任务的脚本
"""
celery框架工作流程
1）创建Celery框架对象app，配置broker和backend，得到的app就是worker
2）给worker对应的app添加可处理的任务函数
3）启动celery服务，运行worker
4）书写添加任务的脚本，执行脚本添加任务到broker，worker会自己异步从broker中拿任务执行，执行结果放在backend中
5) 书写获取任务结果的脚本，明确任务id与执行的app，获取任务结果
"""
tasks.py
from .celery import app
import time
@app.task
def add(n, m):
print(n)
print(m)
time.sleep(10)
print('n+m的结果：%s' % (n + m))
return n + m
@app.task
def low(n, m):
print(n)
print(m)
print('n-m的结果：%s' % (n - m))
return n - m
add_task.py
from celery_task import tasks
# 添加立即执行任务
t1 = tasks.add.delay(10, 20)
t2 = tasks.low.delay(100, 50)
print(t1.id)
# 添加延迟任务
from datetime import datetime, timedelta
eta=datetime.utcnow() + timedelta(seconds=10)
tasks.low.apply_async(args=(200, 50), eta=eta)
---------------------------------------------------------------------------------------------
# 跟celery任务框架没关系,只是一个手动添加任务的脚本文件
from tasks import add, low
# # 导入任务执行函数
# res = add(10,20)
# print(res)
# worker添加任务 .delay()
res = add.delay(20,30)
# 结果自动保存到了redis数据库中
print(res) # 83f9e85f-109c-404b-aa63-6a13e57f1bcd
get_result.py
from celery_task.celery import app
from celery.result import AsyncResult
id = '21325a40-9d32-44b5-a701-9a31cc3c74b5'
if __name__ == '__main__':
async = AsyncResult(id=id, app=app)
if async.successful():
result = async.get()
print(result)
elif async.failed():
print('任务失败')
elif async.status == 'PENDING':
print('任务等待中被执行')
elif async.status == 'RETRY':
print('任务异常后正在重试')
elif async.status == 'STARTED':
print('任务已经开始被执行')
---------------------------------------------------------------------------------------
from tasks import app
from celery.result import AsyncResult
id = 'ad4ca85d-998a-4cc9-9d24-655986a169b3'
# async = AsyncResult(id=id, app=app)
# res = async.get()
# print(res)
# """
if __name__ == '__main__':
# 获取async对象
async = AsyncResult(id=id, app=app)
# 判断是否成功
if async.successful():
# .get() 获取任务对象
result = async.get()
print(result)
# 失败判断
elif async.failed():
print('任务失败')
elif async.status == 'PENDING':
print('任务等待中被执行')
elif async.status == 'RETRY':
print('任务异常后正在重试')
elif async.status == 'STARTED':
print('任务已经开始被执行')
# """
2.3 高级使用 (定时任务)
celery.py
# 1）创建app + 任务
# 2）启动celery(app)服务：
# 非windows
# 命令：celery worker -A celery_task -l info
# windows：
# pip3 install eventlet
# celery worker -A celery_task -l info -P eventlet
# 3）添加任务：自动添加任务，所以要启动一个添加任务的服务
# 命令：celery beat -A celery_task -l info
# 4）获取结果
from celery import Celery
broker = 'redis://127.0.0.1:6379/1'
backend = 'redis://127.0.0.1:6379/2'
app = Celery(broker=broker, backend=backend, include=['celery_task.tasks'])
# 时区
app.conf.timezone = 'Asia/Shanghai'
# 是否使用UTC
app.conf.enable_utc = False
# 任务的定时配置
from datetime import timedelta
from celery.schedules import crontab
app.conf.beat_schedule = {
'low-task': {
'task': 'celery_task.tasks.low',
'schedule': timedelta(seconds=3),
# 'schedule': crontab(hour=8, day_of_week=1), # 每周一早八点
'args': (300, 150),
}
}
--------------------------------------------------------------------------------------------------
# 启动分发
from celery import Celery
broker = 'redis://127.0.0.1:6379/0'
backend = 'redis://127.0.0.1:6379/1'
# worker 使用include将任务文件函数包含在内
app = Celery(broker=broker, backend=backend, include=['celery_task.tasks'])
# 设置定时任务需要配置
# 延时时间
from datetime import timedelta
# 定时至某一时刻
from celery.schedules import crontab
# 时区
app.conf.timezone = 'Asia/Shanghai'
# 是否使用UTC
app.conf.enable_utc = False
app.conf.beat_schedule = {
# 任务的名字
'add-task': {
# 添加任务地址
'task': 'celery_task.tasks.add',
# 定时任务的时间间隔
'schedule': timedelta(seconds=3), # 延时3s
# 'schedule': crontab(hour=8, day_of_week=1), # 每周一早八点
# 任务的参数
'args':(20, 10),
# 关键字参数
# 'kwargs': (),
},
# 添加第二个任务
'low-task': {
'task': 'celery_task.tasks.low',
'schedule': timedelta(seconds=6), # 延时6s
'args': (20, 10),
},
}
添加任务使用socket自动添加
# 添加任务：自动添加任务，所以要启动一个添加任务的服务
# 命令：celery beat -A celery_task -l info
"""
celery框架工作流程
1）创建Celery框架对象app，配置broker和backend，得到的app就是worker
2）给worker对应的app添加可处理的任务函数，用include配置给worker的app
3）完成提供的任务的定时配置app.conf.beat_schedule
4）启动celery服务，运行worker，执行任务
5）启动beat服务，运行beat，添加任务
"""
tasks.py
from .celery import app
import time
@app.task
def add(n, m):
print(n)
print(m)
time.sleep(10)
print('n+m的结果：%s' % (n + m))
return n + m
@app.task
def low(n, m):
print(n)
print(m)
print('n-m的结果：%s' % (n - m))
return n - m
get_result.py
from celery_task.celery import app
from celery.result import AsyncResult
id = '21325a40-9d32-44b5-a701-9a31cc3c74b5'
if __name__ == '__main__':
async = AsyncResult(id=id, app=app)
if async.successful():
result = async.get()
print(result)
elif async.failed():
print('任务失败')
elif async.status == 'PENDING':
print('任务等待中被执行')
elif async.status == 'RETRY':
print('任务异常后正在重试')
elif async.status == 'STARTED':
print('任务已经开始被执行')
2.4 django中使用
celery.py
"""
celery框架django项目工作流程
1）加载django配置环境
2）创建Celery框架对象app，配置broker和backend，得到的app就是worker
3）给worker对应的app添加可处理的任务函数，用include配置给worker的app
4）完成提供的任务的定时配置app.conf.beat_schedule
5）启动celery服务，运行worker，执行任务
6）启动beat服务，运行beat，添加任务
重点：由于采用了django的反射机制，使用celery.py所在的celery_task包必须放置项目的根目录下
"""
# 一、加载django配置环境
import os
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "luffyapi.settings.dev")
# 二、加载celery配置环境
from celery import Celery
# broker
broker = 'redis://127.0.0.1:6379/0'
# backend
backend = 'redis://127.0.0.1:6379/1'
# worker
app = Celery(broker=broker, backend=backend, include=['celery_task.tasks'])
# 时区
app.conf.timezone = 'Asia/Shanghai'
# 是否使用UTC
app.conf.enable_utc = False
# 任务的定时配置
from datetime import timedelta
from celery.schedules import crontab
app.conf.beat_schedule = {
'django-task': {
'task': 'celery_task.tasks.test_django_celery',
'schedule': timedelta(seconds=3),
'args': (),
}
}
tasks.py
from .celery import app
# 获取项目中的模型类
from api.models import Banner
@app.task
def test_django_celery():
banner_query = Banner.objects.filter(is_delete=False).all()
print(banner_query)
luffy项目
前台
freecourse免费课的课程页
<template>
<div class="course">
<Header></Header>
<div class="main">
<!-- 筛选条件 -->
<div class="condition">
<ul class="cate-list">
<li class="title">课程分类:</li>
<li class="this">全部</li>
<li>Python</li>
<li>Linux运维</li>
<li>Python进阶</li>
<li>开发工具</li>
<li>Go语言</li>
<li>机器学习</li>
<li>技术生涯</li>
</ul>
<div class="ordering">
<ul>
<li class="title">筛 选:</li>
<li class="default this">默认</li>
<li class="hot">人气</li>
<li class="price">价格</li>
</ul>
<p class="condition-result">共21个课程</p>
</div>
</div>
<!-- 课程列表 -->
<div class="course-list">
<div class="course-item">
<div class="course-image">
<img src="@/assets/img/course-cover.jpeg" alt="">
</div>
<div class="course-info">
<h3>Python开发21天入门 <span><img src="@/assets/img/avatar1.svg" alt="">100人已加入学习</span></h3>
<p class="teather-info">Alex 金角大王 老男孩Python教学总监 <span>共154课时/更新完成</span></p>
<ul class="lesson-list">
<li><span class="lesson-title">01 | 第1节：初识编码</span> <span class="free">免费</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码初识编码</span> <span class="free">免费</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码初识编码</span></li>
</ul>
<div class="pay-box">
<span class="discount-type">限时免费</span>
<span class="discount-price">￥0.00元</span>
<span class="original-price">原价：9.00元</span>
<span class="buy-now">立即购买</span>
</div>
</div>
</div>
<div class="course-item">
<div class="course-image">
<img src="@/assets/img/course-cover.jpeg" alt="">
</div>
<div class="course-info">
<h3>Python开发21天入门 <span><img src="@/assets/img/avatar1.svg" alt="">100人已加入学习</span></h3>
<p class="teather-info">Alex 金角大王 老男孩Python教学总监 <span>共154课时/更新完成</span></p>
<ul class="lesson-list">
<li><span class="lesson-title">01 | 第1节：初识编码</span> <span class="free">免费</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码初识编码</span> <span class="free">免费</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码初识编码</span></li>
</ul>
<div class="pay-box">
<span class="discount-type">限时免费</span>
<span class="discount-price">￥0.00元</span>
<span class="original-price">原价：9.00元</span>
<span class="buy-now">立即购买</span>
</div>
</div>
</div>
<div class="course-item">
<div class="course-image">
<img src="@/assets/img/course-cover.jpeg" alt="">
</div>
<div class="course-info">
<h3>Python开发21天入门 <span><img src="@/assets/img/avatar1.svg" alt="">100人已加入学习</span></h3>
<p class="teather-info">Alex 金角大王 老男孩Python教学总监 <span>共154课时/更新完成</span></p>
<ul class="lesson-list">
<li><span class="lesson-title">01 | 第1节：初识编码</span> <span class="free">免费</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码初识编码</span> <span class="free">免费</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码初识编码</span></li>
</ul>
<div class="pay-box">
<span class="discount-type">限时免费</span>
<span class="discount-price">￥0.00元</span>
<span class="original-price">原价：9.00元</span>
<span class="buy-now">立即购买</span>
</div>
</div>
</div>
<div class="course-item">
<div class="course-image">
<img src="@/assets/img/course-cover.jpeg" alt="">
</div>
<div class="course-info">
<h3>Python开发21天入门 <span><img src="@/assets/img/avatar1.svg" alt="">100人已加入学习</span></h3>
<p class="teather-info">Alex 金角大王 老男孩Python教学总监 <span>共154课时/更新完成</span></p>
<ul class="lesson-list">
<li><span class="lesson-title">01 | 第1节：初识编码</span> <span class="free">免费</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码初识编码</span> <span class="free">免费</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码</span></li>
<li><span class="lesson-title">01 | 第1节：初识编码初识编码</span></li>
</ul>
<div class="pay-box">
<span class="discount-type">限时免费</span>
<span class="discount-price">￥0.00元</span>
<span class="original-price">原价：9.00元</span>
<span class="buy-now">立即购买</span>
</div>
</div>
</div>
</div>
</div>
<!--<Footer></Footer>-->
</div>
</template>
<script>
import Header from "@/components/Header"
// import Footer from "@/components/Footer"
export default {
name: "Course",
data() {
return {
category: 0,
}
},
components: {
Header,
// Footer,
}
}
</script>
<style scoped>
.course {
background: #f6f6f6;
}
.course .main {
1100px;
margin: 35px auto 0;
}
.course .condition {
margin-bottom: 35px;
padding: 25px 30px 25px 20px;
background: #fff;
border-radius: 4px;
box-shadow: 0 2px 4px 0 #f0f0f0;
}
.course .cate-list {
border-bottom: 1px solid #333;
border-bottom-color: rgba(51, 51, 51, .05);
padding-bottom: 18px;
margin-bottom: 17px;
}
.course .cate-list::after {
content: "";
display: block;
clear: both;
}
.course .cate-list li {
float: left;
font-size: 16px;
padding: 6px 15px;
line-height: 16px;
margin-left: 14px;
position: relative;
transition: all .3s ease;
cursor: pointer;
color: #4a4a4a;
border: 1px solid transparent; /* transparent 透明 */
}
.course .cate-list .title {
color: #888;
margin-left: 0;
letter-spacing: .36px;
padding: 0;
line-height: 28px;
}
.course .cate-list .this {
color: #ffc210;
border: 1px solid #ffc210 !important;
border-radius: 30px;
}
.course .ordering::after {
content: "";
display: block;
clear: both;
}
.course .ordering ul {
float: left;
}
.course .ordering ul::after {
content: "";
display: block;
clear: both;
}
.course .ordering .condition-result {
float: right;
font-size: 14px;
color: #9b9b9b;
line-height: 28px;
}
.course .ordering ul li {
float: left;
padding: 6px 15px;
line-height: 16px;
margin-left: 14px;
position: relative;
transition: all .3s ease;
cursor: pointer;
color: #4a4a4a;
}
.course .ordering .title {
font-size: 16px;
color: #888;
letter-spacing: .36px;
margin-left: 0;
padding: 0;
line-height: 28px;
}
.course .ordering .this {
color: #ffc210;
}
.course .ordering .price {
position: relative;
}
.course .ordering .price::before,
.course .ordering .price::after {
cursor: pointer;
content: "";
display: block;
0px;
height: 0px;
border: 5px solid transparent;
position: absolute;
right: 0;
}
.course .ordering .price::before {
border-bottom: 5px solid #aaa;
margin-bottom: 2px;
top: 2px;
}
.course .ordering .price::after {
border-top: 5px solid #aaa;
bottom: 2px;
}
.course .course-item:hover {
box-shadow: 4px 6px 16px rgba(0, 0, 0, .5);
}
.course .course-item {
1100px;
background: #fff;
padding: 20px 30px 20px 20px;
margin-bottom: 35px;
border-radius: 2px;
cursor: pointer;
box-shadow: 2px 3px 16px rgba(0, 0, 0, .1);
/* css3.0 过渡动画 hover 事件操作 */
transition: all .2s ease;
}
.course .course-item::after {
content: "";
display: block;
clear: both;
}
/* 顶级元素 父级元素 当前元素{} */
.course .course-item .course-image {
float: left;
423px;
height: 210px;
margin-right: 30px;
}
.course .course-item .course-image img {
100%;
}
.course .course-item .course-info {
float: left;
596px;
}
.course-item .course-info h3 {
font-size: 26px;
color: #333;
font-weight: normal;
margin-bottom: 8px;
}
.course-item .course-info h3 span {
font-size: 14px;
color: #9b9b9b;
float: right;
margin-top: 14px;
}
.course-item .course-info h3 span img {
11px;
height: auto;
margin-right: 7px;
}
.course-item .course-info .teather-info {
font-size: 14px;
color: #9b9b9b;
margin-bottom: 14px;
padding-bottom: 14px;
border-bottom: 1px solid #333;
border-bottom-color: rgba(51, 51, 51, .05);
}
.course-item .course-info .teather-info span {
float: right;
}
.course-item .lesson-list::after {
content: "";
display: block;
clear: both;
}
.course-item .lesson-list li {
float: left;
44%;
font-size: 14px;
color: #666;
padding-left: 22px;
/* background: url("路径") 是否平铺 x轴位置 y轴位置 */
background: url("/src/assets/img/play-icon-gray.svg") no-repeat left 4px;
margin-bottom: 15px;
}
.course-item .lesson-list li .lesson-title {
/* 以下3句，文本内容过多，会自动隐藏，并显示省略符号 */
text-overflow: ellipsis;
overflow: hidden;
white-space: nowrap;
display: inline-block;
max- 200px;
}
.course-item .lesson-list li:hover {
background-image: url("/src/assets/img/play-icon-yellow.svg");
color: #ffc210;
}
.course-item .lesson-list li .free {
34px;
height: 20px;
color: #fd7b4d;
vertical-align: super;
margin-left: 10px;
border: 1px solid #fd7b4d;
border-radius: 2px;
text-align: center;
font-size: 13px;
white-space: nowrap;
}
.course-item .lesson-list li:hover .free {
color: #ffc210;
border-color: #ffc210;
}
.course-item .pay-box::after {
content: "";
display: block;
clear: both;
}
.course-item .pay-box .discount-type {
padding: 6px 10px;
font-size: 16px;
color: #fff;
text-align: center;
margin-right: 8px;
background: #fa6240;
border: 1px solid #fa6240;
border-radius: 10px 0 10px 0;
float: left;
}
.course-item .pay-box .discount-price {
font-size: 24px;
color: #fa6240;
float: left;
}
.course-item .pay-box .original-price {
text-decoration: line-through;
font-size: 14px;
color: #9b9b9b;
margin-left: 10px;
float: left;
margin-top: 10px;
}
.course-item .pay-box .buy-now {
120px;
height: 38px;
background: transparent;
color: #fa6240;
font-size: 16px;
border: 1px solid #fd7b4d;
border-radius: 3px;
transition: all .2s ease-in-out;
float: right;
text-align: center;
line-height: 38px;
}
.course-item .pay-box .buy-now:hover {
color: #fff;
background: #ffc210;
border: 1px solid #ffc210;
}
</style>
后台
course的models
'''
from django.db import models
class Course(models.Model):
# 基础字段
name = models.CharField(max_length=64)
title = models.CharField(max_length=64)
level = models.IntegerField(choices=((0, '入门'), (1, '进阶')), default=0)
detail = models.TextField() # 可以关联详情表
type = models.IntegerField(choices=((0, 'Python'), (1, 'Linux')), default=0)
is_show = models.BooleanField(default=False)
# 优化字段
students = models.IntegerField(default=0) # 热度
time = models.IntegerField(default=0) # 总时长
sections = models.IntegerField(default=0) # 总课时
# 虚拟表基类
class Meta:
abstract = True
# 免费课
class FreeCourse(Course):
image = models.ImageField(upload_to='course/free')
attachment = models.FileField(upload_to='attachment')
# 实战课
class ActualCourse(Course):
image = models.ImageField(upload_to='course/actual')
price = models.DecimalField(max_digits=7, decimal_places=2)
cost = models.DecimalField(max_digits=7, decimal_places=2)
# 轻课
class LightCourse(Course):
image = models.ImageField(upload_to='course/light')
price = models.DecimalField(max_digits=7, decimal_places=2)
cost = models.DecimalField(max_digits=7, decimal_places=2)
period = models.IntegerField(verbose_name='学习建议周期(month)', default=0)
# 评论表：分三个表、(id，ctx，date，user_id，free_course_id, comment_id)
# 老师表：在课程表建立多对一外键
# 章节表：在章节表建立多对一外键关联课程
# 课时表：在课时表建立多对一外键关联章节
'''
from django.db import models
# 课程分类
from utils.model import BaseModel
class CourseCategory(BaseModel):
"""分类"""
name = models.CharField(max_length=64, unique=True, verbose_name="分类名称")
class Meta:
db_table = "luffy_course_category"
verbose_name = "分类"
verbose_name_plural = verbose_name
def __str__(self):
return "%s" % self.name
class Course(BaseModel):
"""课程"""
course_type = (
(0, '付费'),
(1, 'VIP专享'),
(2, '学位课程')
)
level_choices = (
(0, '初级'),
(1, '中级'),
(2, '高级'),
)
status_choices = (
(0, '上线'),
(1, '下线'),
(2, '预上线'),
)
name = models.CharField(max_length=128, verbose_name="课程名称")
course_img = models.ImageField(upload_to="courses", max_length=255, verbose_name="封面图片", blank=True, null=True)
course_type = models.SmallIntegerField(choices=course_type, default=0, verbose_name="付费类型")
# 使用这个字段的原因
brief = models.TextField(max_length=2048, verbose_name="详情介绍", null=True, blank=True)
level = models.SmallIntegerField(choices=level_choices, default=0, verbose_name="难度等级")
pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True)
period = models.IntegerField(verbose_name="建议学习周期(day)", default=7)
attachment_path = models.FileField(upload_to="attachment", max_length=128, verbose_name="课件路径", blank=True,
null=True)
status = models.SmallIntegerField(choices=status_choices, default=0, verbose_name="课程状态")
pub_sections = models.IntegerField(verbose_name="课时更新数量", default=0)
price = models.DecimalField(max_digits=6, decimal_places=2, verbose_name="课程原价", default=0)
students = models.IntegerField(verbose_name="学习人数", default=0)
sections = models.IntegerField(verbose_name="总课时数量", default=0)
course_category = models.ForeignKey(CourseCategory, on_delete=models.SET_NULL, db_constraint=False, null=True,
blank=True,
verbose_name="课程分类")
teacher = models.ForeignKey("Teacher", on_delete=models.DO_NOTHING, null=True, blank=True, verbose_name="授课老师")
@property
def level_name(self):
return self.get_level_display()
# 最多显示本课程前4节
@property
def section_list(self):
section_list_temp = []
for chapter in self.coursechapters.all():
for section in chapter.coursesections.all():
section_list_temp.append({
'chapter': chapter.chapter,
'orders': section.orders,
'name': section.name
})
if len(section_list_temp) >= 4:
return section_list_temp
# 不足4条
return section_list_temp
class Meta:
db_table = "luffy_course"
verbose_name = "课程"
verbose_name_plural = "课程"
def __str__(self):
return "%s" % self.name
class Teacher(BaseModel):
"""导师"""
role_choices = (
(0, '讲师'),
(1, '导师'),
(2, '班主任'),
)
name = models.CharField(max_length=32, verbose_name="导师名")
role = models.SmallIntegerField(choices=role_choices, default=0, verbose_name="导师身份")
title = models.CharField(max_length=64, verbose_name="职位、职称")
signature = models.CharField(max_length=255, verbose_name="导师签名", help_text="导师签名", blank=True, null=True)
image = models.ImageField(upload_to="teacher", null=True, verbose_name="导师封面")
brief = models.TextField(max_length=1024, verbose_name="导师描述")
@property
def role_name(self):
return self.get_role_display()
class Meta:
db_table = "luffy_teacher"
verbose_name = "导师"
verbose_name_plural = verbose_name
def __str__(self):
return "%s" % self.name
class CourseChapter(BaseModel):
"""章节"""
course = models.ForeignKey("Course", related_name='coursechapters', on_delete=models.CASCADE, verbose_name="课程名称")
chapter = models.SmallIntegerField(verbose_name="第几章", default=1)
name = models.CharField(max_length=128, verbose_name="章节标题")
summary = models.TextField(verbose_name="章节介绍", blank=True, null=True)
pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True)
class Meta:
db_table = "luffy_course_chapter"
verbose_name = "章节"
verbose_name_plural = verbose_name
def __str__(self):
try:
return "%s:(第%s章)%s" % (self.course, self.chapter, self.name)
except:
return super().__str__()
class CourseSection(BaseModel):
"""课时"""
section_type_choices = (
(0, '文档'),
(1, '练习'),
(2, '视频')
)
chapter = models.ForeignKey("CourseChapter", related_name='coursesections', on_delete=models.CASCADE,
verbose_name="课程章节")
name = models.CharField(max_length=128, verbose_name="课时标题")
section_type = models.SmallIntegerField(default=2, choices=section_type_choices, verbose_name="课时种类")
section_link = models.CharField(max_length=255, blank=True, null=True, verbose_name="课时链接",
help_text="若是video，填vid,若是文档，填link")
duration = models.CharField(verbose_name="视频时长", blank=True, null=True, max_length=32) # 仅在前端展示使用
pub_date = models.DateTimeField(verbose_name="发布时间", auto_now_add=True)
free_trail = models.BooleanField(verbose_name="是否可试看", default=False)
class Meta:
db_table = "luffy_course_Section"
verbose_name = "课时"
verbose_name_plural = verbose_name
def __str__(self):
try:
return "%s-%s" % (self.chapter, self.name)
except:
return super().__str__()
使用xadmin管理表
1.更改admin为adminx
import xadmin
from . import models
# 使用xadmin管理表
xadmin.site.register(models.Course)
xadmin.site.register(models.CourseCategory)
xadmin.site.register(models.CourseChapter)
xadmin.site.register(models.CourseSection)
xadmin.site.register(models.Teacher)
执行数据库迁移
python ../../manage.py makemigrations
python ../../manage.py migrate
更改显示信息
course
# init.py
default_app_config = "course.apps.CourseConfig"
# apps.py
from django.apps import AppConfig
class CourseConfig(AppConfig):
name = 'course'
verbose_name = '课程业务'
课程表数据录入
资源手动迁移
# 头像图片放在 media/teacher 文件夹下
# 课程图片放在 media/course 文件夹下
老师表
INSERT INTO luffy_teacher(id, orders, is_show, is_delete, created_time, updated_time, name, role, title, signature, image, brief) VALUES (1, 1, 1, 0, '2019-07-14 13:44:19.661327', '2019-07-14 13:46:54.246271', 'Alex', 1, '老男孩Python教学总监', '金角大王', 'teacher/alex_icon.png', '老男孩教育CTO & CO-FOUNDER 国内知名PYTHON语言推广者 51CTO学院20162017年度最受学员喜爱10大讲师之一 多款开源软件作者 曾任职公安部、飞信、中金公司、NOKIA中国研究院、华尔街英语、ADVENT、汽车之家等公司');
INSERT INTO luffy_teacher(id, orders, is_show, is_delete, created_time, updated_time, name, role, title, signature, image, brief) VALUES (2, 2, 1, 0, '2019-07-14 13:45:25.092902', '2019-07-14 13:45:25.092936', 'Mjj', 0, '前美团前端项目组架构师', NULL, 'teacher/mjj_icon.png', '是马JJ老师, 一个集美貌与才华于一身的男人，搞过几年IOS，又转了前端开发几年，曾就职于美团网任高级前端开发，后来因为不同意王兴(美团老板)的战略布局而出家做老师去了，有丰富的教学经验，开起车来也毫不含糊。一直专注在前端的前沿技术领域。同时，爱好抽烟、喝酒、烫头(锡纸烫)。 我的最爱是前端，因为前端妹子多。');
INSERT INTO luffy_teacher(id, orders, is_show, is_delete, created_time, updated_time, name, role, title, signature, image, brief) VALUES (3, 3, 1, 0, '2019-07-14 13:46:21.997846', '2019-07-14 13:46:21.997880', 'Lyy', 0, '老男孩Linux学科带头人', NULL, 'teacher/lyy_icon.png', 'Linux运维技术专家，老男孩Linux金牌讲师，讲课风趣幽默、深入浅出、声音洪亮到爆炸');
分类表
INSERT INTO luffy_course_category(id, orders, is_show, is_delete, created_time, updated_time, name) VALUES (1, 1, 1, 0, '2019-07-14 13:40:58.690413', '2019-07-14 13:40:58.690477', 'Python');
INSERT INTO luffy_course_category(id, orders, is_show, is_delete, created_time, updated_time, name) VALUES (2, 2, 1, 0, '2019-07-14 13:41:08.249735', '2019-07-14 13:41:08.249817', 'Linux');
课程表
INSERT INTO luffy_course(id, orders, is_show, is_delete, created_time, updated_time, name, course_img, course_type, brief, level, pub_date, period, attachment_path, status, students, sections, pub_sections, price, course_category_id, teacher_id) VALUES (1, 1, 1, 0, '2019-07-14 13:54:33.095201', '2019-07-14 13:54:33.095238', 'Python开发21天入门', 'courses/alex_python.png', 0, 'Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土&&&Python从入门到入土', 0, '2019-07-14', 21, '', 0, 231, 120, 120, 0.00, 1, 1);
INSERT INTO luffy_course(id, orders, is_show, is_delete, created_time, updated_time, name, course_img, course_type, brief, level, pub_date, period, attachment_path, status, students, sections, pub_sections, price, course_category_id, teacher_id) VALUES (2, 2, 1, 0, '2019-07-14 13:56:05.051103', '2019-07-14 13:56:05.051142', 'Python项目实战', 'courses/mjj_python.png', 0, '', 1, '2019-07-14', 30, '', 0, 340, 120, 120, 99.00, 1, 2);
INSERT INTO luffy_course(id, orders, is_show, is_delete, created_time, updated_time, name, course_img, course_type, brief, level, pub_date, period, attachment_path, status, students, sections, pub_sections, price, course_category_id, teacher_id) VALUES (3, 3, 1, 0, '2019-07-14 13:57:21.190053', '2019-07-14 13:57:21.190095', 'Linux系统基础5周入门精讲', 'courses/lyy_linux.png', 0, '', 0, '2019-07-14', 25, '', 0, 219, 100, 100, 39.00, 2, 3);
章节表
INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (1, 1, 1, 0, '2019-07-14 13:58:34.867005', '2019-07-14 14:00:58.276541', 1, '计算机原理', '', '2019-07-14', 1);
INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (2, 2, 1, 0, '2019-07-14 13:58:48.051543', '2019-07-14 14:01:22.024206', 2, '环境搭建', '', '2019-07-14', 1);
INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (3, 3, 1, 0, '2019-07-14 13:59:09.878183', '2019-07-14 14:01:40.048608', 1, '项目创建', '', '2019-07-14', 2);
INSERT INTO luffy_course_chapter(id, orders, is_show, is_delete, created_time, updated_time, chapter, name, summary, pub_date, course_id) VALUES (4, 4, 1, 0, '2019-07-14 13:59:37.448626', '2019-07-14 14:01:58.709652', 1, 'Linux环境创建', '', '2019-07-14', 3);
课时表
INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (1, 1, 0, '2019-07-14 14:02:33.779098', '2019-07-14 14:02:33.779135', '计算机原理上', 1, 2, NULL, NULL, '2019-07-14 14:02:33.779193', 1, 1);
INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (2, 1, 0, '2019-07-14 14:02:56.657134', '2019-07-14 14:02:56.657173', '计算机原理下', 2, 2, NULL, NULL, '2019-07-14 14:02:56.657227', 1, 1);
INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (3, 1, 0, '2019-07-14 14:03:20.493324', '2019-07-14 14:03:52.329394', '环境搭建上', 1, 2, NULL, NULL, '2019-07-14 14:03:20.493420', 0, 2);
INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (4, 1, 0, '2019-07-14 14:03:36.472742', '2019-07-14 14:03:36.472779', '环境搭建下', 2, 2, NULL, NULL, '2019-07-14 14:03:36.472831', 0, 2);
INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (5, 1, 0, '2019-07-14 14:04:19.338153', '2019-07-14 14:04:19.338192', 'web项目的创建', 1, 2, NULL, NULL, '2019-07-14 14:04:19.338252', 1, 3);
INSERT INTO luffy_course_Section(id, is_show, is_delete, created_time, updated_time, name, orders, section_type, section_link, duration, pub_date, free_trail, chapter_id) VALUES (6, 1, 0, '2019-07-14 14:04:52.895855', '2019-07-14 14:04:52.895890', 'Linux的环境搭建', 1, 2, NULL, NULL, '2019-07-14 14:04:52.895942', 1, 4);
分类群查接口与课程群查接口
urls
from django.urls import path,re_path,include
from . import views
from utils.router import router
# 群查分类
router.register('categories',views.CategoryListViewSet,'category')
# 群查课程主页
router.register('free',views.FreeCourseListViewSet,'free-course')
urlpatterns = [
path('',include(router.urls)),
]
views
from rest_framework.viewsets import GenericViewSet
from rest_framework.mixins import ListModelMixin
from . import models, serializers
# 分类群查
class CategoryListViewSet(ListModelMixin, GenericViewSet):
queryset = models.CourseCategory.objects.filter(is_delete=False,is_show=True).all()
serializer_class = serializers.CategoryModelSerializer
# 课程群查接口
class FreeCourseListViewSet(ListModelMixin, GenericViewSet):
queryset = models.Course.objects.filter(is_delete=False,is_show=True).all()
serializer_class = serializers.CourseModelSerializer
Serializer
from rest_framework import serializers
from . import models
class CategoryModelSerializer(serializers.ModelSerializer):
class Meta:
model = models.CourseCategory
fields = ('name', )
# 子序列化类
class TeacherModelSerializer(serializers.ModelSerializer):
class Meta:
model = models.Teacher
fields = (
'name',
'title',
'signature',
'image',
'brief',
'role_name',
)
class CourseModelSerializer(serializers.ModelSerializer):
teacher = TeacherModelSerializer()
class Meta:
model = models.Course
fields = (
'name',
'course_img',
'level_name',
'period',
'price',
'students',
'sections',
'teacher',
'section_list',
)
models
'''
from django.db import models
class Course(models.Model):
# 基础字段
name = models.CharField(max_length=64)
title = models.CharField(max_length=64)
level = models.IntegerField(choices=((0, '入门'), (1, '进阶')), default=0)
detail = models.TextField() # 可以关联详情表
type = models.IntegerField(choices=((0, 'Python'), (1, 'Linux')), default=0)
is_show = models.BooleanField(default=False)
# 优化字段
students = models.IntegerField(default=0) # 热度
time = models.IntegerField(default=0) # 总时长
sections = models.IntegerField(default=0) # 总课时
# 虚拟表基类
class Meta:
abstract = True
# 免费课
class FreeCourse(Course):
image = models.ImageField(upload_to='course/free')
attachment = models.FileField(upload_to='attachment')
# 实战课
class ActualCourse(Course):
image = models.ImageField(upload_to='course/actual')
price = models.DecimalField(max_digits=7, decimal_places=2)
cost = models.DecimalField(max_digits=7, decimal_places=2)
# 轻课
class LightCourse(Course):
image = models.ImageField(upload_to='course/light')
price = models.DecimalField(max_digits=7, decimal_places=2)
cost = models.DecimalField(max_digits=7, decimal_places=2)
period = models.IntegerField(verbose_name='学习建议周期(month)', default=0)
# 评论表：分三个表、(id，ctx，date，user_id，free_course_id, comment_id)
# 老师表：在课程表建立多对一外键
# 章节表：在章节表建立多对一外键关联课程
# 课时表：在课时表建立多对一外键关联章节
'''
from django.db import models
# 课程分类
from utils.model import BaseModel
class CourseCategory(BaseModel):
"""分类"""
name = models.CharField(max_length=64, unique=True, verbose_name="分类名称")
class Meta:
db_table = "luffy_course_category"
verbose_name = "分类"
verbose_name_plural = verbose_name
def __str__(self):
return "%s" % self.name
class Course(BaseModel):
"""课程"""
course_type = (
(0, '付费'),
(1, 'VIP专享'),
(2, '学位课程')
)
level_choices = (
(0, '初级'),
(1, '中级'),
(2, '高级'),
)
status_choices = (
(0, '上线'),
(1, '下线'),
(2, '预上线'),
)
name = models.CharField(max_length=128, verbose_name="课程名称")
course_img = models.ImageField(upload_to="courses", max_length=255, verbose_name="封面图片", blank=True, null=True)
course_type = models.SmallIntegerField(choices=course_type, default=0, verbose_name="付费类型")
# 使用这个字段的原因
brief = models.TextField(max_length=2048, verbose_name="详情介绍", null=True, blank=True)
level = models.SmallIntegerField(choices=level_choices, default=0, verbose_name="难度等级")
pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True)
period = models.IntegerField(verbose_name="建议学习周期(day)", default=7)
attachment_path = models.FileField(upload_to="attachment", max_length=128, verbose_name="课件路径", blank=True,
null=True)
status = models.SmallIntegerField(choices=status_choices, default=0, verbose_name="课程状态")
pub_sections = models.IntegerField(verbose_name="课时更新数量", default=0)
price = models.DecimalField(max_digits=6, decimal_places=2, verbose_name="课程原价", default=0)
students = models.IntegerField(verbose_name="学习人数", default=0)
sections = models.IntegerField(verbose_name="总课时数量", default=0)
course_category = models.ForeignKey(CourseCategory, on_delete=models.SET_NULL, db_constraint=False, null=True,
blank=True,
verbose_name="课程分类")
teacher = models.ForeignKey("Teacher", on_delete=models.DO_NOTHING, null=True, blank=True, verbose_name="授课老师")
# 等级
@property
def level_name(self):
return self.get_level_display()
# 最多显示本课程前4节
@property
def section_list(self):
section_list_temp = []
for chapter in self.coursechapters.all():
for section in chapter.coursesections.all():
section_list_temp.append({
'chapter': chapter.chapter,
'orders': section.orders,
'name': section.name
})
if len(section_list_temp) >= 4:
return section_list_temp
# 不足4条
return section_list_temp
class Meta:
db_table = "luffy_course"
verbose_name = "课程"
verbose_name_plural = "课程"
def __str__(self):
return "%s" % self.name
class Teacher(BaseModel):
"""导师"""
role_choices = (
(0, '讲师'),
(1, '导师'),
(2, '班主任'),
)
name = models.CharField(max_length=32, verbose_name="导师名")
role = models.SmallIntegerField(choices=role_choices, default=0, verbose_name="导师身份")
title = models.CharField(max_length=64, verbose_name="职位、职称")
signature = models.CharField(max_length=255, verbose_name="导师签名", help_text="导师签名", blank=True, null=True)
image = models.ImageField(upload_to="teacher", null=True, verbose_name="导师封面")
brief = models.TextField(max_length=1024, verbose_name="导师描述")
@property
def role_name(self):
return self.get_role_display()
class Meta:
db_table = "luffy_teacher"
verbose_name = "导师"
verbose_name_plural = verbose_name
def __str__(self):
return "%s" % self.name
class CourseChapter(BaseModel):
"""章节"""
course = models.ForeignKey("Course", related_name='coursechapters', on_delete=models.CASCADE, verbose_name="课程名称")
chapter = models.SmallIntegerField(verbose_name="第几章", default=1)
name = models.CharField(max_length=128, verbose_name="章节标题")
summary = models.TextField(verbose_name="章节介绍", blank=True, null=True)
pub_date = models.DateField(verbose_name="发布日期", auto_now_add=True)
class Meta:
db_table = "luffy_course_chapter"
verbose_name = "章节"
verbose_name_plural = verbose_name
def __str__(self):
try:
return "%s:(第%s章)%s" % (self.course, self.chapter, self.name)
except:
return super().__str__()
class CourseSection(BaseModel):
"""课时"""
section_type_choices = (
(0, '文档'),
(1, '练习'),
(2, '视频')
)
chapter = models.ForeignKey("CourseChapter", related_name='coursesections', on_delete=models.CASCADE,
verbose_name="课程章节")
name = models.CharField(max_length=128, verbose_name="课时标题")
section_type = models.SmallIntegerField(default=2, choices=section_type_choices, verbose_name="课时种类")
section_link = models.CharField(max_length=255, blank=True, null=True, verbose_name="课时链接",
help_text="若是video，填vid,若是文档，填link")
duration = models.CharField(verbose_name="视频时长", blank=True, null=True, max_length=32) # 仅在前端展示使用
pub_date = models.DateTimeField(verbose_name="发布时间", auto_now_add=True)
free_trail = models.BooleanField(verbose_name="是否可试看", default=False)
class Meta:
db_table = "luffy_course_Section"
verbose_name = "课时"
verbose_name_plural = verbose_name
def __str__(self):
try:
return "%s-%s" % (self.chapter, self.name)
except:
return super().__str__()