课程详情页之后台
一、流程
'''
1. 课程单查
CourseView配置RetrieveModelMixin
2. 课程章节
新建视图中 CourseChapterView, 继承G/L
新建序列化 CourseChapterModelSerializer
需要的字段. name, summary, chapter,
章节下的课时使用子序列化. 新建序列化 CourseSectionModelSerializer
需要的字段name, orders, duration, section_type_name, section_link, free_trail
配置路由 course_chapter
问题: 会把所有的章节查出来
解决: 按照课程过滤
问题: 前端的章节使用的路由与刚刚写的不匹配
解决: 修改后端路由为 chapters
'''
二、路由：course/urls.py
router.register('free', views.CourseView, 'free')
router.register('chapters', views.CourseChapterView, 'chapters')
三、视图：course/views.py
from rest_framework.viewsets import GenericViewSet
from rest_framework.mixins import (
ListModelMixin, RetrieveModelMixin
)
from .models import (
CourseCategory, Course, CourseChapter
)
from .serializer import (
CourseCategoryModelSerializer, CourseModelSerializer, CourseChapterModelSerializer
)
# 课程群查
from .pagination import PageNumberPagination
from rest_framework.filters import OrderingFilter, SearchFilter
from django_filters.rest_framework import DjangoFilterBackend
class CourseView(ListModelMixin, RetrieveModelMixin, GenericViewSet):
queryset = Course.objects.filter(is_delete=False, is_show=True).order_by('orders')
serializer_class = CourseModelSerializer
pagination_class = PageNumberPagination
filter_backends = []
# 内置排序
filter_backends.append(OrderingFilter)
ordering_param = 'ordering'
ordering_fields = ('id', 'price', 'students')
# django-filter过滤
filter_backends.append(DjangoFilterBackend)
# 指定过滤字段方式一:
filter_fields = ['course_category', 'students']
# 一个课程的所有章节（群查）
class CourseChapterView(ListModelMixin, GenericViewSet):
queryset = CourseChapter.objects.filter(is_delete=False, is_show=True).order_by('orders')
serializer_class = CourseChapterModelSerializer
# 课程章节按照每个课程进行过滤
filter_backends = [DjangoFilterBackend]
filter_fields = ['course']
四、序列化：course/serializer.py
class CourseSectionSerializer(serializers.ModelSerializer):
class Meta:
model = models.CourseSection
fields = ('name', 'orders', 'section_link', 'duration', 'free_trail')
class CourseChapterSerializer(serializers.ModelSerializer):
coursesections = CourseSectionSerializer(many=True)
class Meta:
model = models.CourseChapter
fields = ('name', 'chapter', 'summary', 'coursesections')
