GenericAPIView, drf內置的基礎分頁器和偏移分頁器的使用, 過濾器, django-filter插件實現區間分類

目錄

• GenericAPIView
• drf內置的基礎分頁器和偏移分頁器的使用
• 過濾器
  • drf內置搜索過濾器和排序過濾器的使用
  • django-filter插件實現區間分類
  • 自定義過濾器
• 前端視頻播放與後端視頻託管

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內置的基礎分頁器和偏移分頁器的使用

'''
# ...\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  # 使用分頁器後, 前端獲取數據的方式爲response.data.results
    

# ...\luffyapi\luffyapi\apps\course\course_pagination.py
from rest_framework import pagination
# 基礎分頁
class CoursePageNumberPagination(pagination.PageNumberPagination):
    page_size = 10  # 設置一頁顯示的條數
    page_query_param = 'page'  # 用戶能夠經過關鍵字page查詢指定頁碼的數據
    page_size_query_param = 'page_size'  # 用戶能夠經過關鍵字page_size對一頁顯示的條數進行更改
    max_page_size = 10  # 設置一頁最大能夠顯示的條數


# 偏移分頁
class CourseLimitOffsetPagination(pagination.LimitOffsetPagination):
    default_limit = 10  # 設置一頁顯示的條數
    limit_query_param = 'limit'  # 用戶能夠經過關鍵字limit對一頁顯示的條數進行更改
    offset_query_param = 'offset'  # 用戶能夠經過關鍵字offset指定一頁數據顯示的起始位置
    max_limit = 10  # 設置一頁最大能夠顯示的條數
'''

過濾器

drf內置搜索過濾器和排序過濾器的使用

'''
# ...\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]
    
    # 只能使用數據庫字段
    search_fields = ['name']  # http://127.0.0.1:8000/course/free/?search=python, 數據量大時須要建index索引
    ordering_fields = ['price', 'id', 'students']  # http://127.0.0.1:8000/course/free/?ordering=-price
'''

django-filter插件實現區間分類

安裝: 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):
    # 自定義過濾區間
    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')  # 區間通常爲數字區間, 使用NumberFilter類便可

    class Meta:
        model = models.Course
        fields = ['course_category']  # 定義分組字段, http://127.0.0.1:8000/course/free/?course_category=1
'''

自定義過濾器

'''
class MyFilter:
    def filter_queryset(self, request, queryset, view):
        ...
            return queryset
'''

前端視頻播放與後端視頻託管

前端詳情頁視頻播放須要先安裝插件: cnpm install vue-video-player

七牛雲視頻託管