目录
上节回顾
# 1 celery 执行异步，延迟，定时任务
任务.delay()
任务.apply_async(args=[],eta=时间对象)
celery.py 的app的配置信息
app.conf.beat_schedule
启动beat和worker
# 2 django中使用celery
# 3 秒杀案例
# 4 接口加缓存
-写一个类，继承这个类，查询所有就有缓存，没继承就没有缓存
-common_view.py
class CacheListModelMixin(ListModelMixin):
cache_key = None
def list(self, request, *args, **kwargs):
data = cache.get(self.cache_key)
if data:
return APIResponse(data=data)
# 走数据库
res = super(CacheListModelMixin, self).list(request, *args, **kwargs)
cache.set(self.cache_key, res.data)
return APIResponse(data=res.data)
# 5 双写一致性问题
-因为加了缓存，数据库编号，缓存不会编号，导致数据不一致
-解决问题：
1 定时更新
2 修改数据库，更新缓存
3 修改数据，删除缓存
# 6 定时更新轮播图
-home_task.py 新建一个任务(函数)，update_banner
-celery.py 给app配置一个定时任务
-启动worker，启动beat
# 7 分析课程表
-课程分类表
-课程表(实战课表)
-章节表
-课时表
-老师表
# @app.task与@shared.task 的区别：
他俩作用一样，第一个需要指定app，第二个直接导入使用，直接从内存中取出来app对象
# 关系型数据库
关系型数据库来说只有外键。都是通过foreign key建立的外键关系。
查所有、带过滤的大部分情况需要给接口加缓存。
查询所有的缓存类：
装饰器：
APSchudler
# APSchudler 异步
如果公司只是想做定时任务，celery比较大，比较麻烦，一般公司会使用
pip install apscheduler
### 每隔多长事件
import time
from apscheduler.schedulers.blocking import BlockingScheduler
# 任务
def my_job(i):
print (i)
sched = BlockingScheduler()
sched.add_job(my_job, 'interval', seconds=5,values=['学会了'])
## 按年月日
import datetime
from apscheduler.schedulers.blocking import BlockingScheduler
scheduler = BlockingScheduler()
def my_job(text):
print(text)
# datetime类型（用于精确时间）
scheduler.add_job(my_job, 'date', run_date=datetime(2022, 4, 25, 17, 30, 5), args=['测试任务'])
## 按corn
import datetime
from apscheduler.schedulers.background import BackgroundScheduler
def job_func(text):
print("当前时间：", datetime.datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S.%f")[:-3])
scheduler = BackgroundScheduler()
# 在每年 1-3、7-9 月份中的每个星期一、二中的 00:00, 01:00, 02:00 和 03:00 执行 job_func 任务
scheduler .add_job(job_func, 'cron', month='1-3,7-9',day='0, tue', hour='0-3')
# 推荐阅读
http://sinhub.cn/2018/11/apscheduler-user-guide/
双写一致性
# 双写一致性问题
-因为加了缓存，数据库编号，缓存不会编号，导致数据不一致
-解决问题：
1 定时更新
有一定的延迟，需要考虑哪些接口使用定时更新，哪些接口实时更新。
2 修改数据库，更新缓存
修改完数据库，提交一个更新任务。
3 修改数据，删除缓存
写一个通用的删缓存函数，只要传入cache_key就可以了。传入不同的cache_key删除的是不同的缓存。
4.先删缓存、再更数据库：（有问题）
删除了缓存之后，此时数据库还没有更新，此时请求到达数据库，又会立马产生一个缓存，这个个缓存是用的老数据。
5.先更新缓存、再改数据库：（有问题）
今日内容
1 课程表数据录入
-- 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, '2022-07-14 13:44:19.661327', '2022-07-14 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2016\2017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, '2022-07-14 13:45:25.092902', '2022-07-14 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, '2022-07-14 13:46:21.997846', '2022-07-14 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, '2022-07-14 13:40:58.690413', '2022-07-14 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, '2022-07-14 13:41:08.249735', '2022-07-14 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, '2022-07-14 13:54:33.095201', '2022-07-14 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, '2022-07-14', 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, '2022-07-14 13:56:05.051103', '2022-07-14 13:56:05.051142', 'Python项目实战', 'courses/mjj_python.png', 0, '', 1, '2022-07-14', 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, '2022-07-14 13:57:21.190053', '2022-07-14 13:57:21.190095', 'Linux系统基础5周入门精讲', 'courses/lyy_linux.png', 0, '', 0, '2022-07-14', 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, '2022-07-14 13:58:34.867005', '2022-07-14 14:00:58.276541', 1, '计算机原理', '', '2022-07-14', 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, '2022-07-14 13:58:48.051543', '2022-07-14 14:01:22.024206', 2, '环境搭建', '', '2022-07-14', 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, '2022-07-14 13:59:09.878183', '2022-07-14 14:01:40.048608', 1, '项目创建', '', '2022-07-14', 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, '2022-07-14 13:59:37.448626', '2022-07-14 14:01:58.709652', 1, 'Linux环境创建', '', '2022-07-14', 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, '2022-07-14 14:02:33.779098', '2022-07-14 14:02:33.779135', '计算机原理上', 1, 2, NULL, NULL, '2022-07-14 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, '2022-07-14 14:02:56.657134', '2022-07-14 14:02:56.657173', '计算机原理下', 2, 2, NULL, NULL, '2022-07-14 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, '2022-07-14 14:03:20.493324', '2022-07-14 14:03:52.329394', '环境搭建上', 1, 2, NULL, NULL, '2022-07-14 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, '2022-07-14 14:03:36.472742', '2022-07-14 14:03:36.472779', '环境搭建下', 2, 2, NULL, NULL, '2022-07-14 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, '2022-07-14 14:04:19.338153', '2022-07-14 14:04:19.338192', 'web项目的创建', 1, 2, NULL, NULL, '2022-07-14 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, '2022-07-14 14:04:52.895855', '2022-07-14 14:04:52.895890', 'Linux的环境搭建', 1, 2, NULL, NULL, '2022-07-14 14:04:52.895942', 1, 4);
2 课程分类接口
2.1 路由
router.register('category', views.CourseCategoryView, 'category')
2.2 序列化类
class CourseCategorySerializer(serializers.ModelSerializer):
class Meta:
model = CourseCategory
fields = ['id', 'name']
2.3 视图类
class CourseCategoryView(GenericViewSet, CommonListModelMixin):
queryset = CourseCategory.objects.filter(is_delete=False, is_show=True).order_by('orders')
serializer_class = CourseCategorySerializer
3 所有课程接口(过滤，排序)
# 可以按课程分类过滤
# 排序：学习人数和价格排序
# 查询所有课程
-老师的数据
-章节和课时：如果课时数大于4，就返回4条，如果小于4，有多少就返回多少
3.1 表模型
class Course(BaseModel):
...
def __str__(self):
return "%s" % self.name
def course_type_name(self):
return self.get_course_type_display() # 返回choice对应的名字
def level_name(self):
return self.get_level_display() # 返回choice对应的名字
def status_name(self):
return self.get_status_display() # 返回choice对应的名字
def section_list(self):
'''
# 逻辑：
#1 先根据课程，拿到所有章节
#2 循环所有章节，拿出每个章节下的课时
#3 拼到一个列表中
# 4 判断一下列表长度是否大于等于四，直接 return
'''
# 反向查询，拿到所有章节 表名小写_set.all() 这个拿不到
# course_chapter_list=self.coursechapter_set.all()
l = []
course_chapter_list = self.coursechapters.all()
for course_chapter in course_chapter_list:
# 根据章节，拿出所有课时
course_section_list = course_chapter.coursesections.all()
for course_section in course_section_list:
l.append({
'name': course_section.name,
'section_link': course_section.section_link,
'duration': course_section.duration,
'free_trail': course_section.free_trail,
})
if len(l) >= 4:
return l
return l
3.2 序列化类
# 老师序列化类
class TeacherSerializer(serializers.ModelSerializer):
class Meta:
model = Teacher
fields = [
'id', 'name', 'role_name', 'title', 'signature', 'image', 'brief'
]
class CourseSerializer(serializers.ModelSerializer):
teacher = TeacherSerializer() # 子序列化
class Meta:
model = Course
fields = [
'id',
'name',
'course_img',
'brief', # 课程介绍
'attachment_path', # 课程课件路径
'pub_sections', # 更新了多少课时
'price', # 价格
'students', # 学习人数
'period', # 建议学习周期
'sections', # 总课时数量
'course_type_name', # 定制返回格式，在序列化类中或表模型中写方法 表模型中写的方法
'level_name', # 等级名字
'status_name', # 课程状态
'teacher', # 老师 ： 表模型中写 序列化类中 子序列化：给Teacher表写个序列化类
'section_list', # 表模型中写 （DDD:领域驱动模型）
]
子序列化：
序列化外键字段会拿到对象。这个对象可以写一个序列化类。
给外键字段对应的表专门写一个序列化类：
查看前端获取的数据：
领域驱动设计：
表设计驱动 ---> 领域驱动 ---> 逻辑写在表模型中
课程动态显示课时
为了序列化类的section_list字段，需要在模型层写函数：
反向查询表面小写 如果是多条还要加_set.
related_name：基于对象的反向查询，用于替换表名小写。
related_query_name：基于下划线的反向查询，用来替换表名小写。
3.3 视图类
class CourseView(GenericViewSet, CommonListModelMixin):
queryset = Course.objects.filter(is_delete=False, is_show=True).order_by('orders')
serializer_class = CourseSerializer
# 分页
pagination_class = PageNumberPagination
# 排序
filter_backends = [OrderingFilter, DjangoFilterBackend]
ordering_fields = ['price', 'students']
# 过滤 根据分类过滤，使用第三方的django-filter
# http://127.0.0.1:8000/api/v1/course/course/?ordering=students&course_category=2
filterset_fields = ['course_category'] # 按课程分类过滤
课程分页：
课程排序：
课程过滤：
使用第三方的django-filter进行过滤。
3.4 路由
# 访问 http://127.0.0.1:8000/api/v1/course/course/ ---->get 请求就可以查询所有课程
router.register('course', views.CourseView, 'course')
4 课程详情接口（没有章节和课时的内容）
# 课程详情页面：
-课程详情接口 ---》写好了class CourseView(GenericViewSet, CommonListModelMixin,RetrieveModelMixin):
-查询所有章节接口带按课程id过滤功能
# 只需要在课程列表页的
图类上加RetrieveModelMixin 即可
代码：
class CourseView(GenericViewSet, CommonListModelMixin, RetrieveModelMixin):
...
def retrieve(self, request, *args, **kwargs):
res = super().retrieve(request, *args, **kwargs)
return APIResponse(data=res.data)
5 所有章节接口(按课程过滤)
# 查询所有章节----》按课程id号过滤---》当前课程的所有章节http://127.0.0.1:8000/api/v1/course/coursechapter/?course=3
5.1 视图类
class CourseChapterView(GenericViewSet, CommonListModelMixin):
queryset = CourseChapter.objects.filter(is_delete=False, is_show=True).order_by('orders')
serializer_class = CourseChapterSerializer
filter_backends = [DjangoFilterBackend]
filterset_fields = ['course'] # 按课程课程过滤
5.2 序列化类
# 课时的序列化类
class CourseSectionSerializer(serializers.ModelSerializer):
class Meta:
model = CourseSection
# 课时名字， 课时排序 课时视频连接，视频时长 是否免费
fields = ('id', 'name', 'orders', 'section_link', 'duration', 'free_trail')
# 章节序列化类
class CourseChapterSerializer(serializers.ModelSerializer):
# 子序列化 多条
coursesections = CourseSectionSerializer(many=True)
class Meta:
model = CourseChapter
# 章节名字 第几章 章节介绍 coursesections：章节下所有课时，子序列化
fields = ('id', 'name', 'chapter', 'summary', 'coursesections')
5.3 路由
# 访问 http://127.0.0.1:8000/api/v1/course/coursechapter/ ---->get 请求就可以查询所有章节，带过滤，查到某个课程的所有章节
router.register('coursechapter', views.CourseChapterView, 'coursechapter')
related_name 会在正向类中隐藏一个字段：
子序列化类 many=True 因为章节是多条。
我们写的课程详情（没有章节和课时的内容）:
可以单独写一个查询课程详情的接口。包含了所有课程详情、章节和课时，这些前端所需要的信息：
查看效果：
课程详情：使用富文本编辑器插入
6 课程列表前端
<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="filter.course_category==0?'this':''" @click="filter.course_category=0">全部</li>
<li :class="filter.course_category==category.id?'this':''" v-for="category in category_list"
@click="filter.course_category=category.id" :key="category.name">{{ category.name }}
</li>
</ul>
<div class="ordering">
<ul>
<li class="title">筛 选:</li>
<li class="default" :class="(filter.ordering=='id' || filter.ordering=='-id')?'this':''"
@click="filter.ordering='-id'">默认
</li>
<li class="hot" :class="(filter.ordering=='students' || filter.ordering=='-students')?'this':''"
@click="filter.ordering=(filter.ordering=='-students'?'students':'-students')">人气
</li>
<li class="price"
:class="filter.ordering=='price'?'price_up this':(filter.ordering=='-price'?'price_down this':'')"
@click="filter.ordering=(filter.ordering=='-price'?'price':'-price')">价格
</li>
</ul>
<p class="condition-result">共{{ course_total }}个课程</p>
</div>
</div>
<!-- 课程列表 -->
<div class="course-list">
<div class="course-item" v-for="course in course_list" :key="course.name">
<div class="course-image">
<img :src="course.course_img" alt="">
</div>
<div class="course-info">
<h3>
<router-link :to="'/free/detail/'+course.id">{{ course.name }}</router-link>
<span><img src="@/assets/img/avatar1.svg" alt="">{{ course.students }}人已加入学习</span>
</h3>
<p class="teather-info">
{{ course.teacher.name }} {{ course.teacher.title }} {{ course.teacher.signature }}
<span
v-if="course.sections>course.pub_sections">共{{ course.sections }}课时/已更新{{
course.pub_sections
}}课时</span>
<span v-else>共{{ course.sections }}课时/更新完成</span>
</p>
<ul class="section-list">
<li v-for="(section, key) in course.section_list" :key="section.name"><span
class="section-title">0{{ key + 1 }} | {{ section.name }}</span>
<span class="free" v-if="section.free_trail">免费</span></li>
</ul>
<div class="pay-box">
<div v-if="course.discount_type">
<span class="discount-type">{{ course.discount_type }}</span>
<span class="discount-price">￥{{ course.real_price }}元</span>
<span class="original-price">原价：{{ course.price }}元</span>
</div>
<span v-else class="discount-price">￥{{ course.price }}元</span>
<span class="buy-now">立即购买</span>
</div>
</div>
</div>
</div>
<div class="course_pagination block">
<el-pagination
@size-change="handleSizeChange"
@current-change="handleCurrentChange"
:current-page.sync="filter.page"
:page-sizes="[2, 3, 5, 10]"
:page-size="filter.page_size"
layout="sizes, prev, pager, next"
:total="course_total">
</el-pagination>
</div>
</div>
<Footer></Footer>
</div>
</template>
<script>
import Header from "@/components/Header"
import Footer from "@/components/Footer"
export default {
name: "Course",
data() {
return {
category_list: [], // 课程分类列表
course_list: [], // 课程列表
course_total: 0, // 当前课程的总数量
filter: {
course_category: 0, // 当前用户选择的课程分类，刚进入页面默认为全部，值为0
ordering: "-id", // 数据的排序方式，默认值是-id，表示对于id进行降序排列
page_size: 2, // 单页数据量
page: 1,
}
}
},
created() {
this.get_category();
this.get_course();
},
components: {
Header,
Footer,
},
watch: {
"filter.course_category": function () {
this.filter.page = 1;
this.get_course();
},
"filter.ordering": function () {
this.get_course();
},
"filter.page_size": function () {
this.get_course();
},
"filter.page": function () {
this.get_course();
}
},
methods: {
handleSizeChange(val) {
// 每页数据量发生变化时执行的方法
this.filter.page = 1;
this.filter.page_size = val;
},
handleCurrentChange(val) {
// 页码发生变化时执行的方法
this.filter.page = val;
},
get_category() {
// 获取课程分类信息
this.$axios.get(`${this.$settings.BASE_URL}/course/category/`).then(response => {
this.category_list = response.data.data;
}).catch(() => {
this.$message({
message: "获取课程分类信息有误，请联系客服工作人员",
})
})
},
get_course() {
// 排序
let filters = {
ordering: this.filter.ordering, // 排序
};
// 判决是否进行分类课程的展示
if (this.filter.course_category > 0) {
filters.course_category = this.filter.course_category;
}
// 设置单页数据量
if (this.filter.page_size > 0) {
filters.page_size = this.filter.page_size;
} else {
filters.page_size = 5;
}
// 设置当前页码
if (this.filter.page > 1) {
filters.page = this.filter.page;
} else {
filters.page = 1;
}
// 获取课程列表信息
this.$axios.get(`${this.$settings.BASE_URL}/course/course/`, {
params: filters
}).then(response => {
// console.log(response.data);
this.course_list = response.data.data.results;
this.course_total = response.data.data.count;
// console.log(this.course_list);
}).catch(() => {
this.$message({
message: "获取课程信息有误，请联系客服工作人员"
})
})
}
}
}
</script>
<style scoped>
.course {
background: #f6f6f6;
}
.course .main {
width: 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;
width: 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 .ordering .price_up::before {
border-bottom-color: #ffc210;
}
.course .ordering .price_down::after {
border-top-color: #ffc210;
}
.course .course-item:hover {
box-shadow: 4px 6px 16px rgba(0, 0, 0, .5);
}
.course .course-item {
width: 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;
width: 423px;
height: 210px;
margin-right: 30px;
}
.course .course-item .course-image img {
max-width: 100%;
max-height: 210px;
}
.course .course-item .course-info {
float: left;
width: 596px;
}
.course-item .course-info h3 a {
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 {
width: 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 .section-list::after {
content: "";
display: block;
clear: both;
}
.course-item .section-list li {
float: left;
width: 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 .section-list li .section-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-width: 200px;
}
.course-item .section-list li:hover {
background-image: url("/src/assets/img/play-icon-yellow.svg");
color: #ffc210;
}
.course-item .section-list li .free {
width: 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 .section-list li:hover .free {
color: #ffc210;
border-color: #ffc210;
}
.course-item {
position: relative;
}
.course-item .pay-box {
position: absolute;
bottom: 20px;
width: 600px;
}
.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 {
width: 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;
position: absolute;
right: 0;
bottom: 5px;
}
.course-item .pay-box .buy-now:hover {
color: #fff;
background: #ffc210;
border: 1px solid #ffc210;
}
.course .course_pagination {
margin-bottom: 60px;
text-align: center;
}
</style>
7 课程详情前端
# 视频播放器组件
1 安装
cnpm install vue-core-video-player -S
2 在main.js配置
import VueCoreVideoPlayer from 'vue-core-video-player'
Vue.use(VueCoreVideoPlayer, {
lang: 'zh-CN'
})
3 在使用的组件中，使用即可
<vue-core-video-player
src="https://video.pearvideo.com/mp4/third/20230307/cont-1779481-10023871-222053-hd.mp4"
@play="onPlayerPlay"
@pause="onPlayerPause"
title="课程名字"
controls='auto'
>
</vue-core-video-player>
onPlayerPlay() {
// 当视频播放时，执行的方法
console.log('视频开始播放')
},
onPlayerPause() {
// 当视频暂停播放时，执行的方法
console.log('视频暂停，可以打开广告了')
},
4 更详细：https://www.cnblogs.com/liuqingzheng/p/16204851.html
# 根据课程详情页面分析接口
1 课程详情接口，根据id查
2 课程章节接口 （单独写的课程章节接口，但它是可以放在课程详情接口中的）
3 查询老师接口(不需要，课程详情接口中有老师所有信息了)
视频播放器组件：
require第三方导入和import官方导入，这两个是一个意思。
降版本安装：vue-video-player
安装：vue-core-video-player
参数：
切换清晰度。
control = "auto" 会自动将进度条消失。
<template>
<div class="detail">
<Header/>
<div class="main">
<div class="course-info">
<div class="wrap-left">
<vue-core-video-player
src="https://video.pearvideo.com/mp4/third/20230307/cont-1779481-10023871-222053-hd.mp4"
@play="onPlayerPlay"
@pause="onPlayerPause"
title="课程名字"
controls='auto'
>
</vue-core-video-player>
</div>
<div class="wrap-right">
<h3 class="course-name">{{ course_info.name }}</h3>
<p class="data">
{{ course_info.students }}人在学 课程总时长：{{ course_info.sections }}课时/{{ course_info.pub_sections }}小时 难度：{{ course_info.level_name }}</p>
<div class="sale-time">
<p class="sale-type">价格 <span class="original_price">¥{{ course_info.price }}</span></p>
<p class="expire"></p>
</div>
<div class="buy">
<div class="buy-btn">
<button class="buy-now">立即购买</button>
<button class="free">免费试学</button>
</div>
<!--<div class="add-cart" @click="add_cart(course_info.id)">-->
<!--<img src="@/assets/img/cart-yellow.svg" alt="">加入购物车-->
<!--</div>-->
</div>
</div>
</div>
<div class="course-tab">
<ul class="tab-list">
<li :class="tabIndex==1?'active':''" @click="tabIndex=1">详情介绍</li>
<li :class="tabIndex==2?'active':''" @click="tabIndex=2">课程章节 <span :class="tabIndex!=2?'free':''">(试学)</span>
</li>
<li :class="tabIndex==3?'active':''" @click="tabIndex=3">用户评论</li>
<li :class="tabIndex==4?'active':''" @click="tabIndex=4">常见问题</li>
</ul>
</div>
<div class="course-content">
<div class="course-tab-list">
<div class="tab-item" v-if="tabIndex==1">
<div class="course-brief" v-html="course_info.brief_text"></div>
</div>
<div class="tab-item" v-if="tabIndex==2">
<div class="tab-item-title">
<p class="chapter">课程章节</p>
<p class="chapter-length">共{{ course_chapters.length }}章 {{ course_info.sections }}个课时</p>
</div>
<div class="chapter-item" v-for="chapter in course_chapters" :key="chapter.name">
<p class="chapter-title"><img src="@/assets/img/enum.svg"
alt="">第{{ chapter.chapter }}章·{{ chapter.name }}
</p>
<ul class="section-list">
<li class="section-item" v-for="section in chapter.coursesections" :key="section.name">
<p class="name"><span class="index">{{ chapter.chapter }}-{{ section.orders }}</span>
{{ section.name }}<span class="free" v-if="section.free_trail">免费</span></p>
<p class="time">{{ section.duration }} <img src="@/assets/img/chapter-player.svg"></p>
<button class="try" v-if="section.free_trail">立即试学</button>
<button class="try" v-else>立即购买</button>
</li>
</ul>
</div>
</div>
<div class="tab-item" v-if="tabIndex==3">
用户评论
</div>
<div class="tab-item" v-if="tabIndex==4">
常见问题
</div>
</div>
<div class="course-side">
<div class="teacher-info">
<h4 class="side-title"><span>授课老师</span></h4>
<div class="teacher-content">
<div class="cont1">
<img :src="course_info.teacher.image">
<div class="name">
<p class="teacher-name">{{ course_info.teacher.name }}
{{ course_info.teacher.title }}</p>
<p class="teacher-title">{{ course_info.teacher.signature }}</p>
</div>
</div>
<p class="narrative">{{ course_info.teacher.brief }}</p>
</div>
</div>
</div>
</div>
</div>
<Footer/>
</div>
</template>
<script>
import Header from "@/components/Header"
import Footer from "@/components/Footer"
export default {
name: "Detail",
data() {
return {
tabIndex: 2, // 当前选项卡显示的下标
course_id: 0, // 当前课程信息的ID
course_info: {
teacher: {},
}, // 课程信息
course_chapters: [], // 课程的章节课时列表
}
},
created() {
this.get_course_id();
this.get_course_data();
this.get_chapter();
},
methods: {
onPlayerPlay() {
// 当视频播放时，执行的方法
console.log('视频开始播放')
},
onPlayerPause() {
// 当视频暂停播放时，执行的方法
console.log('视频暂停，可以打开广告了')
},
get_course_id() {
// 获取地址栏上面的课程ID
this.course_id = this.$route.params.pk || this.$route.query.pk;
if (this.course_id < 1) {
let _this = this;
_this.$alert("对不起，当前视频不存在！", "警告", {
callback() {
_this.$router.go(-1);
}
});
}
},
get_course_data() {
// ajax请求课程信息
this.$axios.get(`${this.$settings.base_url}/course/free/${this.course_id}/`).then(response => {
// window.console.log(response.data);
this.course_info = response.data;
console.log(this.course_info)
}).catch(() => {
this.$message({
message: "对不起，访问页面出错！请联系客服工作人员！"
});
})
},
get_chapter() {
// 获取当前课程对应的章节课时信息
// http://127.0.0.1:8000/course/chapters/?course=(pk)
this.$axios.get(`${this.$settings.base_url}/course/chapters/`, {
params: {
"course": this.course_id,
}
}).then(response => {
this.course_chapters = response.data;
}).catch(error => {
window.console.log(error.response);
})
},
},
components: {
Header,
Footer,
}
}
</script>
<style scoped>
.main {
background: #fff;
padding-top: 30px;
}
.course-info {
width: 1200px;
margin: 0 auto;
overflow: hidden;
}
.wrap-left {
float: left;
width: 690px;
height: 388px;
background-color: #000;
}
.wrap-right {
float: left;
position: relative;
height: 388px;
}
.course-name {
font-size: 20px;
color: #333;
padding: 10px 23px;
letter-spacing: .45px;
}
.data {
padding-left: 23px;
padding-right: 23px;
padding-bottom: 16px;
font-size: 14px;
color: #9b9b9b;
}
.sale-time {
width: 464px;
background: #fa6240;
font-size: 14px;
color: #4a4a4a;
padding: 10px 23px;
overflow: hidden;
}
.sale-type {
font-size: 16px;
color: #fff;
letter-spacing: .36px;
float: left;
}
.sale-time .expire {
font-size: 14px;
color: #fff;
float: right;
}
.sale-time .expire .second {
width: 24px;
display: inline-block;
background: #fafafa;
color: #5e5e5e;
padding: 6px 0;
text-align: center;
}
.course-price {
background: #fff;
font-size: 14px;
color: #4a4a4a;
padding: 5px 23px;
}
.discount {
font-size: 26px;
color: #fa6240;
margin-left: 10px;
display: inline-block;
margin-bottom: -5px;
}
.original {
font-size: 14px;
color: #9b9b9b;
margin-left: 10px;
text-decoration: line-through;
}
.buy {
width: 464px;
padding: 0px 23px;
position: absolute;
left: 0;
bottom: 20px;
overflow: hidden;
}
.buy .buy-btn {
float: left;
}
.buy .buy-now {
width: 125px;
height: 40px;
border: 0;
background: #ffc210;
border-radius: 4px;
color: #fff;
cursor: pointer;
margin-right: 15px;
outline: none;
}
.buy .free {
width: 125px;
height: 40px;
border-radius: 4px;
cursor: pointer;
margin-right: 15px;
background: #fff;
color: #ffc210;
border: 1px solid #ffc210;
}
.add-cart {
float: right;
font-size: 14px;
color: #ffc210;
text-align: center;
cursor: pointer;
margin-top: 10px;
}
.add-cart img {
width: 20px;
height: 18px;
margin-right: 7px;
vertical-align: middle;
}
.course-tab {
width: 100%;
background: #fff;
margin-bottom: 30px;
box-shadow: 0 2px 4px 0 #f0f0f0;
}
.course-tab .tab-list {
width: 1200px;
margin: auto;
color: #4a4a4a;
overflow: hidden;
}
.tab-list li {
float: left;
margin-right: 15px;
padding: 26px 20px 16px;
font-size: 17px;
cursor: pointer;
}
.tab-list .active {
color: #ffc210;
border-bottom: 2px solid #ffc210;
}
.tab-list .free {
color: #fb7c55;
}
.course-content {
width: 1200px;
margin: 0 auto;
background: #FAFAFA;
overflow: hidden;
padding-bottom: 40px;
}
.course-tab-list {
width: 880px;
height: auto;
padding: 20px;
background: #fff;
float: left;
box-sizing: border-box;
overflow: hidden;
position: relative;
box-shadow: 0 2px 4px 0 #f0f0f0;
}
.tab-item {
width: 880px;
background: #fff;
padding-bottom: 20px;
box-shadow: 0 2px 4px 0 #f0f0f0;
}
.tab-item-title {
justify-content: space-between;
padding: 25px 20px 11px;
border-radius: 4px;
margin-bottom: 20px;
border-bottom: 1px solid #333;
border-bottom-color: rgba(51, 51, 51, .05);
overflow: hidden;
}
.chapter {
font-size: 17px;
color: #4a4a4a;
float: left;
}
.chapter-length {
float: right;
font-size: 14px;
color: #9b9b9b;
letter-spacing: .19px;
}
.chapter-title {
font-size: 16px;
color: #4a4a4a;
letter-spacing: .26px;
padding: 12px;
background: #eee;
border-radius: 2px;
display: -ms-flexbox;
display: flex;
-ms-flex-align: center;
align-items: center;
}
.chapter-title img {
width: 18px;
height: 18px;
margin-right: 7px;
vertical-align: middle;
}
.section-list {
padding: 0 20px;
}
.section-list .section-item {
padding: 15px 20px 15px 36px;
cursor: pointer;
justify-content: space-between;
position: relative;
overflow: hidden;
}
.section-item .name {
font-size: 14px;
color: #666;
float: left;
}
.section-item .index {
margin-right: 5px;
}
.section-item .free {
font-size: 12px;
color: #fff;
letter-spacing: .19px;
background: #ffc210;
border-radius: 100px;
padding: 1px 9px;
margin-left: 10px;
}
.section-item .time {
font-size: 14px;
color: #666;
letter-spacing: .23px;
opacity: 1;
transition: all .15s ease-in-out;
float: right;
}
.section-item .time img {
width: 18px;
height: 18px;
margin-left: 15px;
vertical-align: text-bottom;
}
.section-item .try {
width: 86px;
height: 28px;
background: #ffc210;
border-radius: 4px;
font-size: 14px;
color: #fff;
position: absolute;
right: 20px;
top: 10px;
opacity: 0;
transition: all .2s ease-in-out;
cursor: pointer;
outline: none;
border: none;
}
.section-item:hover {
background: #fcf7ef;
box-shadow: 0 0 0 0 #f3f3f3;
}
.section-item:hover .name {
color: #333;
}
.section-item:hover .try {
opacity: 1;
}
.course-side {
width: 300px;
height: auto;
margin-left: 20px;
float: right;
}
.teacher-info {
background: #fff;
margin-bottom: 20px;
box-shadow: 0 2px 4px 0 #f0f0f0;
}
.side-title {
font-weight: normal;
font-size: 17px;
color: #4a4a4a;
padding: 18px 14px;
border-bottom: 1px solid #333;
border-bottom-color: rgba(51, 51, 51, .05);
}
.side-title span {
display: inline-block;
border-left: 2px solid #ffc210;
padding-left: 12px;
}
.teacher-content {
padding: 30px 20px;
box-sizing: border-box;
}
.teacher-content .cont1 {
margin-bottom: 12px;
overflow: hidden;
}
.teacher-content .cont1 img {
width: 54px;
height: 54px;
margin-right: 12px;
float: left;
}
.teacher-content .cont1 .name {
float: right;
}
.teacher-content .cont1 .teacher-name {
width: 188px;
font-size: 16px;
color: #4a4a4a;
padding-bottom: 4px;
}
.teacher-content .cont1 .teacher-title {
width: 188px;
font-size: 13px;
color: #9b9b9b;
white-space: nowrap;
}
.teacher-content .narrative {
font-size: 14px;
color: #666;
line-height: 24px;
}
</style>
补充
# related_name和related_query_name
# related_name: 基于对象的反向查询用来替换 表名小写_set 的
# related_query_name: 基于连表（下划线）的反向查询，用来替换 表名小写 的
练习
# 讲到那写道那
# 其中架构可以写的项目
1 开源erp项目：django 前后端都参照开源项目
-django-vue-admin
-djago 商城
-自动化运维
spug
2 gitee上找开源前端 你对后端
3 纯自己写
-前端后端自己写
-二手交易
-商城
-二手租房
4 考试系统