view > views.APIView > generics.GenericAPIView > viewsets.GenericViewSet
1.APIView(继承 view)官方范例:
class GoodsList(APIView):
"""
List all snippets, or create a new snippet.
""" def get(self, request, format=None):
Goods = Snippet.objects.all() serializer = GoodsSerializer(Goods, many=True) return Response(serializer.data)
重写get()，指定模型，并序列化（serializer）
serializer：
class GoodsSerializer(serializers.Serializer): # 类似与form的功能，但是能序列化为json
name = serializers.CharField(required=True, max_length=100)
click_num = serializers.IntegerField(default=0)
使用serializers.ModelSerializer：
# serializers.ModelSerializer 继承serializers.serializers(可不要指明每个字段，在fields里添加就好了)
class GoodsSerializer(serializers.ModelSerializer): # 类似与form的功能，但是能序列化为json
category = CategorySerializer() # 嵌套外键，获取外键的全部信息，注意CategorySerializer已定义
images = GoodsImageSerializer(many=True)
2.使用上层的generics.GenericAPIView：
在generics.GenericAPIView（view,views.APIView也是 ）要重写get()，post()等方法,如果不重写表明不接受GET，POST等方法
覆盖内置变量queryset，serializer_class，get()调用了list是在mixins.ListModelMixin当中的，此函数帮助我们分页，
调用serializer完成序列化
class GoodsListView(mixins.ListModelMixin, generics.GenericAPIView):
"""
商品列表页
"""
queryset = Goods.objects.all()
serializer_class = GoodsSerializer
def get(self, request, *args, **kwargs):
return self.list(request, *args, **kwargs)
更简单的方法：generics帮我们封装好了一些方法可以直接用：
可以直接使用ListAPIView，因为已经帮我们填入了mixins.ListModelMixin和GenericAPIView：
class ListAPIView(mixins.ListModelMixin,
GenericAPIView):
"""
Concrete view for listing a queryset.
"""
def get(self, request, *args, **kwargs):
return self.list(request, *args, **kwargs)
上边的代码改为：
class GoodsListView(generics.ListAPIView):
"""
商品列表页
"""
queryset = Goods.objects.all()
serializer_class = GoodsSerializer
分页设置：在setting中设置：
REST_FRAMEWORK = { # rest-framework的配置
'PAGE_SIZE': 10, # 分页配置
}
自定义分页配置：
class GoodsPagination(PageNumberPagination): # 定制分页设置
page_size = 12
page_size_query_param = 'page_size'
page_query_param = "page"
max_page_size = 100
字段引用：
pagination_class = GoodsPagination
更更好用的ViewSet：
class SnippetList(APIView): """ List all snippets, or create a new snippet. """ def get(self, request, format=None): snippets = Snippet.objects.all() serializer = SnippetSerializer(snippets, many=True) return Response(serializer.data)
作者：天涯明月笙
链接：https://www.jianshu.com/p/6a6fa62d8152
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。
class SnippetList(APIView): """ List all snippets, or create a new snippet. """ def get(self, request, format=None): snippets = Snippet.objects.all() serializer = SnippetSerializer(snippets, many=True) return Response(serializer.data)
作者：天涯明月笙
链接：https://www.jianshu.com/p/6a6fa62d8152
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。
class SnippetList(APIView): """ List all snippets, or create a new snippet. """ def get(self, request, format=None): snippets = Snippet.objects.all() serializer = SnippetSerializer(snippets, many=True) return Response(serializer.data)
作者：天涯明月笙
链接：https://www.jianshu.com/p/6a6fa62d8152
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。
继承了ViewSetMixin, generics.GenericAPIView，也就是加了ViewSetMixin中的方法
class GenericViewSet(ViewSetMixin, generics.GenericAPIView):
"""
The GenericViewSet class does not provide any actions by default,
but does include the base set of generic view behavior, such as
the `get_object` and `get_queryset` methods.
"""
pass
ViewSetMixin部分代码：
class ViewSetMixin(object):
@classonlymethod
def as_view(cls, actions=None, **initkwargs):
重写as_view使得注册URL变得更简单！
使用router：
from rest_framework.routers import DefaultRouter
router = DefaultRouter()
router.register(r'goods', GoodsListViewSet, base_name="goods")
urlpatterns = [
url(r'^', include(router.urls)),
]
router自动把GET，POST等绑定
自定义绑定：
goods_list = GoodsListViewSet.as_view({
'get': 'list',
})
url(r'goods/$', goods_list, name='goods-list'),
4.queryset为得到所有的模型，要是想要筛选则要使用：
def get_queryset(self):
return Goods.object.filter(shop_price__get=100) 返回大于100的商品
那么queryset = Goods.objects.all()就不需要了
5，minxin：
