我正在开发一个 django 项目,在该项目中我试图获取所有具有update_ts
场大于product_sync_ts
from Product
一次从服务器获取表,但由于产品数量很大,这需要大量时间来获取所有数据。我还将当前时间戳与数据一起返回。现在我想对结果进行分页。
我以前的代码:
Views.py
@api_view(['GET'])
def productlist(request, format=None):
product_sync_ts = request.GET.get(
'product_sync_ts', None)
if product_sync_ts:
product =Product.objects.filter(
update_ts__gt=product_sync_ts)
)
serializer = SyncedProductSerializer(
instance={'products': product})
return response(serializer.data)
else:
content = {'details': "Bad Request"}
raise APIException400(request, content)
序列化器.py
class SyncedProductSerializer(serializers.Serializer):
product_sync_ts = serializers.SerializerMethodField(
method_name='get_current_ts'
)
products = ProductSerializer(many=True, read_only=True)
class Meta:
fields = ('products', 'product_sync_ts')
def get_current_ts(self, obj):
product_sync_ts = datetime.utcnow().isoformat(' ')
return product_sync_ts
class ProductSerializer(serializers.ModelSerializer):
image_url = serializers.SerializerMethodField(
method_name='change_image_url'
)
class Meta:
model = Product
fields = (
'id',
'name',
'unit',
'price',
'image_url'
)
def change_image_url(self, obj):
return ''.join([
CDN_URL, str(obj.image_url)
]) if str(obj.image_url) else None
我如何尝试修改它以进行分页:
Views.py
class PaginatedProductList(APIView):
def get(self, request, format=None):
product_sync_ts = request.GET.get(
'product_sync_ts', None)
if product_sync_ts:
product = GrProduct.objects.filter(
update_ts__gt=product_sync_ts
)
paginator = Paginator(product, 1000)
page = request.GET.get('page')
try:
product = paginator.page(page)
except PageNotAnInteger:
product = paginator.page(1)
except EmptyPage:
product = paginator.page(paginator.num_pages)
serializer = SyncedProductSerializer(
instance={'products': product})
return Response(serializer.data)
else:
content = {'details': "Bad Request"}
raise APIException400(request, content)
这工作正常,我得到分页结果,但问题是我无法将下一页和上一页信息发送给客户端。客户端无法知道有效(非空)页数是多少。
有人可以建议我如何修改我的代码才能做到这一点。