GenericAPIView
'''
class GenericAPIView(views.APIView):
...
filter_backends = api_settings.DEFAULT_FILTER_BACKENDS
pagination_class = api_settings.DEFAULT_PAGINATION_CLASS
...
def filter_queryset(self, queryset):
for backend in list(self.filter_backends):
queryset = backend().filter_queryset(self.request, queryset, self)
return queryset
@property
def paginator(self):
if not hasattr(self, '_paginator'):
if self.pagination_class is None:
self._paginator = None
else:
self._paginator = self.pagination_class()
return self._paginator
def paginate_queryset(self, queryset):
if self.paginator is None:
return None
return self.paginator.paginate_queryset(queryset, self.request, view=self)
def get_paginated_response(self, data):
assert self.paginator is not None
return self.paginator.get_paginated_response(data)
'''
drf内置的基础分页器和偏移分页器的使用
'''
# ...\luffyapi\luffyapi\apps\course\views.py
from rest_framework.viewsets import ReadOnlyModelViewSet
from . import models, course_serializers, course_pagination
class FreeCourseReadOnlyModelViewSet(ReadOnlyModelViewSet):
...
# pagination_class = course_pagination.CourseLimitOffsetPagination
pagination_class = course_pagination.CoursePageNumberPagination # 使用分页器后, 前端获取数据的方式为response.data.results
# ...\luffyapi\luffyapi\apps\course\course_pagination.py
from rest_framework import pagination
# 基础分页
class CoursePageNumberPagination(pagination.PageNumberPagination):
page_size = 10 # 设置一页显示的条数
page_query_param = 'page' # 用户可以通过关键字page查询指定页码的数据
page_size_query_param = 'page_size' # 用户可以通过关键字page_size对一页显示的条数进行更改
max_page_size = 10 # 设置一页最大可以显示的条数
# 偏移分页
class CourseLimitOffsetPagination(pagination.LimitOffsetPagination):
default_limit = 10 # 设置一页显示的条数
limit_query_param = 'limit' # 用户可以通过关键字limit对一页显示的条数进行更改
offset_query_param = 'offset' # 用户可以通过关键字offset指定一页数据显示的起始位置
max_limit = 10 # 设置一页最大可以显示的条数
'''
过滤器
drf内置搜索过滤器和排序过滤器的使用
'''
# ...\luffyapi\luffyapi\apps\course\views.py
from rest_framework.viewsets import ReadOnlyModelViewSet
...
from rest_framework import filters
class FreeCourseReadOnlyModelViewSet(ReadOnlyModelViewSet):
...
filter_backends = [filters.SearchFilter, filters.OrderingFilter]
# 只能使用数据库字段
search_fields = ['name'] # http://127.0.0.1:8000/course/free/?search=python, 数据量大时需要建index索引
ordering_fields = ['price', 'id', 'students'] # http://127.0.0.1:8000/course/free/?ordering=-price
'''
django-filter插件实现区间分类
安装: pip install django-filter
'''
# D:\PythonVirtualEnvironment\luffyapi\Lib\site-packages\django_filters\rest_framework\backends.py
from . import ..., filterset
...
class DjangoFilterBackend(metaclass=RenameAttributes):
filterset_base = filterset.FilterSet
...
def get_filterset_class(self, view, queryset=None):
...
if filterset_class is None and hasattr(view, 'filter_class'):
...
filterset_class = getattr(view, 'filter_class', None)
...
if filterset_fields and queryset is not None:
MetaBase = getattr(self.filterset_base, 'Meta', object)
class AutoFilterSet(self.filterset_base):
class Meta(MetaBase):
model = queryset.model
fields = filterset_fields
return AutoFilterSet
return None
# ...\luffyapi\luffyapi\apps\course\views.py
from rest_framework.viewsets import ReadOnlyModelViewSet
...
from . import models, course_filterset
from django_filters.rest_framework import DjangoFilterBackend
class FreeCourseReadOnlyModelViewSet(ReadOnlyModelViewSet):
...
filter_backends = [DjangoFilterBackend, ]
filter_class = course_filterset.CourseFilterSet
# ...\luffyapi\luffyapi\apps\course\course_filterset.py
from django_filters.rest_framework.filterset import FilterSet
from django_filters import filters
from . import models
class CourseFilterSet(FilterSet):
# 自定义过滤区间
min_price = filters.NumberFilter(field_name='price', lookup_expr='gte') # http://127.0.0.1:8000/course/free/?min_price=99
max_price = filters.NumberFilter(field_name='price', lookup_expr='lte') # 区间一般为数字区间, 使用NumberFilter类即可
class Meta:
model = models.Course
fields = ['course_category'] # 定义分组字段, http://127.0.0.1:8000/course/free/?course_category=1
'''
自定义过滤器
'''
class MyFilter:
def filter_queryset(self, request, queryset, view):
...
return queryset
'''
前端视频播放与后端视频托管
前端详情页视频播放需要先安装插件: cnpm install vue-video-player
七牛云视频托管
